Sunday, December 30, 2007

The King and the Poison Puzzle

The King and the Poison Puzzle
In a far away land, it was known that if you drank poison, the only way to save yourself is to drink a stronger poison, which neutralizes the weaker poison. The king that ruled the land wanted to make sure that he possessed the strongest poison in the kingdom, in order to ensure his survival, in any situation. So the king called the kingdom's pharmacist and the kingdom's treasurer, he gave each a week to make the strongest poison. Then, each would drink the other one's poison, then his own, and the one that will survive, will be the one that had the stronger poison.

The pharmacist went straight to work, but the treasurer knew he had no chance, for the pharmacist was much more experienced in this field, so instead, he made up a plan to survive and make sure the pharmacist dies. On the last day the pharmacist suddenly realized that the treasurer would know he had no chance, so he must have a plan. After a little thought, the pharmacist realized what the treasurer's plan must be, and he concocted a counter plan, to make sure he survives and the treasurer dies. When the time came, the king summoned both of them. They drank the poisons as planned, and the treasurer died, the pharmacist survived, and the king didn't get what he wanted.
What exactly happened there?
---

Sunday, December 23, 2007

What's Special About This Number?

I was wondering when i came across this page is to whether really a number has its own identity. If it does, how many such numbers would be there, a few hundreds?? thats it and definitely not in order. But this definitely changed my view and perceptions. This is guy is very into numbers and really puzzled me up on how would he had found these all.

The list contains the speciallity of first 10,000 numbers. Imagine that the numbers from 0 to 9999 have their own identity. They can be attributed to their own special property. To list a few here are some. To go through the complete list visit What's Special About This Number?. Take a look each has a context reference too. Definitely a hell of work and dedication by the owner.

0 is the additive identity.
1 is the multiplicative identity.
2 is the only even prime.
3 is the number of spatial dimensions we live in.
4 is the smallest number of colors sufficient to color all planar maps.
5 is the number of Platonic solids.
6 is the smallest perfect number.
7 is the smallest number of faces of a regular polygon that is not constructible by straightedge and compass.
8 is the largest cube in the Fibonacci sequence.
9 is the maximum number of cubes that are needed to sum to any positive integer.
10 is the base of our number system.
11 is the largest known multiplicative persistence.
12 is the smallest abundant number.
13 is the number of Archimedian solids.
14 is the smallest number n with the property that there are no numbers relatively prime to n smaller numbers.
15 is the smallest composite number n with the property that there is only one group of order n.
16 is the only number of the form xy = yx with x and y different integers.
17 is the number of wallpaper groups.
18 is the only number that is twice the sum of its digits.
19 is the maximum number of 4th powers needed to sum to any number.20 is the number of rooted trees with 6 vertices.
21 is the smallest number of distinct squares needed to tile a square.
22 is the number of partitions of 8.
23 is the smallest number of integer-sided boxes that tile a box so that no two boxes share a common length.
24 is the largest number divisible by all numbers less than its square root.
25 is the smallest square that can be written as a sum of 2 squares.
26 is the only positive number to be directly between a square and a cube.
27 is the largest number that is the sum of the digits of its cube.
28 is the 2nd perfect number.
29 is the 7th Lucas number.
30 is the largest number with the property that all smaller numbers relatively prime to it are prime.
31 is a Mersenne prime.
32 is the smallest 5th power (besides 1).
33 is the largest number that is not a sum of distinct triangular numbers.
34 is the smallest number with the property that it and its neighbors have the same number of divisors.
35 is the number of hexominoes.

Complete list at.... What's Special About This Number?
---

Wednesday, December 19, 2007

The Recruitment Puzzle - Cool motivations.

Recruitment has now become a game , an approach or a puzzle. The interview is based on how a person can think in different ways. And so is the company Look at the following advertisements of the companies announcing the openings in their company. A great motivation to join a company, if they think this much for an advertisements / billboards , they sure must be interesting to join and rather more interesting to work for them.

Lets take up the challenge and look through these state of the art advertisements:

1.


2.


*Answer: "Now Hiring" in ASCII
3.


4. Ad for a job found in
Manhattan Craigslist (click for enlarge)




5.


---

Sunday, December 16, 2007

Solution to Vandal Puzzle

This is the solution to the puzzle The Vandal Puzzle - The Ug and the Mug published on 20th November. Those who haven't yet tried the puzzle Click here!!

And here goes the Solution/Answer to the Puzzle:
There is no way that Ug and Mug can produce 2000 pieces of glass starting from one piece, and smashing any piece into 7 or 10 pieces.

We can show this by showing that there is a special property that one piece of glass has, which is not changed by being struck by Mug or Ug, or more precisely, which is also a property of the number of pieces of glass resulting after a strike.

To understand how this argument works, suppose a simpler case, that a single vandal named Bug can smash one piece of glass into 3. Now can he ever create 100 pieces of glass? If he takes one of the 3 pieces of glass and smashes it into 3, then he has now a total of 5 pieces. Choosing any one of these pieces and smashing it yields a total of 7, and so on. Every one of these numbers is odd. This is no accident. If you start with an odd number of pieces (which we did), take one and make it three, you have increased your original number by 2, which leaves it odd. Since you can't get from 1 to 100 by hops of size 2, Bug can't make 100 pieces by starting from 1.

Now we note the Ug and Mug have a similar problem. Each strike by Ug increases the number of pieces by 6, while Mug increases the number by 9. Both of these numbers are divisible by 3. That means that adding them to the current total of pieces cannot change the remainder of the total, when it is divided by 3. This remainder is called an invariant. The number 1 has a remainder of 1 when divided by 3. Therefore, at any time during Ug and Mug's spree, the total number of pieces of glass must have a remainder of 1 when divided by 3. The number 2000 does not have this property, and so it is not possible for them to create this number of pieces.
---

Friday, December 14, 2007

Origin of Google ... The Googol Inc.

For people wondereing what the thing , the big name GOOGLE means. Is google really a word and if it is what does it mean. Many years ago this word ceased to exist and never ever had a meaning. With the coming up of Google, its now the most known word for internet users. A person starting to learn internet first learns how to use google. Yeah.. the story not behind the Google but being Google as compiled by David Koller is as
In 1996, Larry Page and Sergey Brin called their initial search engine "BackRub," named for its analysis of the web's "back links." Larry's office was in room 360 of the Gates CS Building, which he shared with several other graduate students, including Sean Anderson, Tamara Munzner, and Lucas Pereira. In 1997, Larry and his officemates discussed a number of possible new names for the rapidly improving search technology. Sean recalls the final brainstorming session as occurring one day during September of that year.


Sean and Larry were in their office, using the whiteboard, trying to think up a good name - something that related to the indexing of an immense amount of data. Sean verbally suggested the word "googolplex," and Larry responded verbally with the shortened form, "googol" (both words refer to specific large numbers). Sean was seated at his computer terminal, so he executed a search of the Internet domain name registry database to see if the newly suggested name was still available for registration and use. Sean is not an infallible speller, and he made the mistake of searching for the name spelled as "google.com," which he found to be available. Larry liked the name, and within hours he took the step of registering the name "google.com" for himself and Sergey (the domain name registration record dates from September 15, 1997).
---

Sunday, December 9, 2007

The Inadvertent Glossary of College - A revival... Revisited

IIT Delhi - My CollegeIIT KharagpurIIT Bombay

Earlier posted without meaning.. now have them.. Take a look

After the college, i remember the college language the most. I took this initiative earlier to create a glossary for all those unscrupulous words, but all those gone with the wind with the end of college's last day. So i have started the compilation once again.
This isn't actually a glossary of the words but only a list from my IIT days.
I invite all other students and "ex-students" to add their words as comments underneath. Also do add your version of meanings for the words you give and already given here.
A comprehensive version of the glossary is on its way. So do contribute to the glossary and ahhh well .. a contri to your cccccccooooooooooooooooooooollll days.... college days!! Do name your college dudes /dudettes
Please do add the funny names you gave to your friends with the serendipity behind the name

So here we go : currently the INADVERTENT GLOSSARY OF IITIANS with meainings - A LINGO to REVIVE

attachee - The day scholars. Origin - The students are either "allotted" or are "attached" to a hostel. Allotted students live at the hostels or are hostelites while the attached students are represented by the attached hostels for all events and competitions.
abs – Absolute achievement for a work. Most generally when a student gets the maximum marks obtainable in an exam
arbit – Arbitrary. Generally used for arbitrary work done/ comments passed by a person
bakait – The person performing bakaiti
bakaiti – Drastic version of timepass with no results and no reason.
bakar – synnonym for bakaiti
bakchod – Person who is highly involved and is fond of bakaiti
banda – A boy
bandi – A girl
batti – Electrical department
bhatke – The B.Tech students.
compu – Computer science department
contri – Contribution. Generally used for the contribution based parties/outings.
d00d - Elated version of Dude.
dabbe wala – Person with computer or a student of computer science department
dayski – Day scholar
depc – Department change
despo – Desperate person, Generally for girls
DISCO - The Disciplinary committee of IIT.
fattu – Person who fears for doing anything he is asked to or he needs to
fight marna – Trying hard on doing something
fighter – Person trying hard on everything
fod dalna – Excelled with flying colors in something
frustaapa – Act of showing Frustration
frustu – Frustrated person. Generally used for a person desperate for girls
fukka – Failed in an exam or more appropriately getting F-Grade in an exam
full toss – Student who happened dropped any year before graduation
fultoo – On full swing
funde – Advices/Fundamentals of a person.
fundoo – Highly impressing
gadda – Seriously foolish person
HFC - Holistic Food Centre
Holistic – HFC – Holistic Food Centre
ic – Institute C……. Generally used for a person considered as worst student in the college
insti – The institutional area. Generally the place where classes take place
janta – People involved
load – Tension arising due to some work or act of someone
maggu – Highly studious person
mast – Interesting and enjoyable. Better called as cool.
matke – The M.Tech students.
max – Maximum. Generally used for the high enthusiasm of a person
ms – Main structure. The highest building in IIT delhi
mugai or magai – Studying.
pain maarna – 1. Unnecessarily trying for something, 2. Frustrated by something
RR – Reading room
senti – The feeling of getting Sentimental.
sponti – The spontaneity of the person regarding any thing he/she does.
stud – The Person expert/ excel
studaapa – Act of showing perfection/excellence/ stud things
Sutta - Cigarette / Smoking
tapna – Look out for girls
tappa – Student who dropped an year or more before graduation
timepass – Just for passing time
waat – Had worse of all the things
WindT – Wind tunnel in IIT Delhi
ZeroX – hell of the famous version of XEROX shop at IIT DELHI
zukk – Zero marks

CONTRIBUTRIONS

kirtan added:
NBD :- Its actual meaning is Nervous Break Down, but this term is used generally whenever any1 is scene in tension or thinking about something
(for more details, you may contact some IITB Junta)
NBDU :- one who found in NBD very often

uncommon common added:
rattafication meaning "act of learning without understanding a single thing".

mohit added:
ghissu - highly studious person..
ghisai - act of studying
bond - an expert in any field...
bondappa - showing off the bond inside you
chutiyappa - do some chutiya stuff..
facha - first yearite male
fachi - first yearite female
Andhra - all the southies..
god - expert in any field..
hadd - anything extreme
diro - director

heres sm lingo related more to IITG -
SAC - sport activity centre
NAC - new acedemic complex
CC - computer centre
TC - transit complex
khokha - faculty gate market
chinky - d local gals for thier assamese looks
localite - neone belonging to d northeast
dosa - dean of student affairs

HEY PEOPLE PLEASE DO ADD , IF I FORGOT SOMETHING HERE!!! I AM WAITING!!!


---

Thursday, December 6, 2007

The Ant's Puzzle

Problem with Ants Puzzle
The noted gourmet Pangolini Aardvark is preparing a late night snack of "Ant au Chocolat" and "Ant au Fromage". This requires the use of a five foot pole. One end of the pole is over a bucket of melted chocolate and the other is over a bucket of melted cheese.

Pangolini sprinkles some ants onto the pole. They immediately start scampering along the pole in random directions. If two ants run into each other then they both instantaneously reverse their directions and are now moving away from each other. An ant can change direction many times. Eventually, all of the ants will fall off one or other end of the pole. If each ant travels at a speed of one inch per second, what is the maximum time until all ants have fallen off?

Suppose now that n ants are placed on a circle of five foot circumference and randomly choose their direction of travel and again reverse direction when they bump into each other. One of the ants is named Alice. What is the probability that Alice is back where she started, one minute after the ants start their scampering.

Back to the pole. Alice starts in the middle of the pole. There are n other ants placed randomly on the pole and they start scampering in random directions. Alice has a cold. When an ant with a cold bumps into another ant, the uninfected ant catches a cold too. What is the expected number of ants who catch cold before they all fall off the pole?

---

Saturday, December 1, 2007

Solution to Adultery Puzzle

This is the solution/answer for the Adultery puzzle posted on 29th October 2007.
Those who havent tried it yet.. Give it a try at Adultery Puzzle

If there was only one cheating husband, then on the day of the announcement, 999 wives would know there was one cheating husband, as they had already assumed; one wife, the one being cheated on, thought there were no cheaters, and now knows there is at least one. Hence, she realizes, it must be her husband who is cheating. So she turns him in.

Suppose instead there were two cheating husbands. On the first day, 998 wives know what's up; wife #999 knows that husband #1000 is cheating, and wife #1000 knows that husband #999 is cheating. They both expect the one cheating husband to be executed. But neither one turns in their own husband, so nothing actually happens. Thus, after the executioner gets no offers, both wives realize that the only explanation is that there must be two cheating husbands, not one. So on day 2 there is a double execution. Reasoning this way, for our original problem, on the 50th day, all 50 cheated wives realize that their own husband is a cheater, and all 50 husbands get the chop.

---

Sunday, November 25, 2007

Solution to Chess Freeze Puzzle

Here is the solution to the Chess Freeze Puzzle published on 1st November 2007. If you havent tried it as yet.. First take a look at : Chess Freeze Puzzle
At first, the board looked almost unchanged to Norm and Ray. The most important change was that Sally had reversed the board itself; this kept Norm and Ray from noticing that the White pieces had advanced to the Black side, and vice versa. With the pawns "behind" the other pieces, and only able to move forward, things are starting to look grim. Perhaps the Knights can hop out of the jam? No, because two pawns have deftly sidestepped to block that escape route. There's no way out.

Black

N R B Q K B R N
. p p p p p p . <-- White's pieces. The pawns only go "North".
. p . . . . p .
. . . . . . . .
. . . . . . . .
. p . . . . p .
. p p p p p p . <-- Black's pieces. These pawns only go "South".
N R B Q K B R N

White


Can you think of another such setup of pieces, that is substantially different from this one, and in which neither player can move or capture?

"Intellectual Genealogy Note": I really did think up this problem and its solution all by myself. However, I'm not expecting much in the way of royalties!

---

Tuesday, November 20, 2007

Vandal Puzzle - The Ug and The Mug

Vandal Puzzle - The Ug and The Mug
Two vandals, Ug and Mug, attack a shop window made of a single pane of glass. Whenever Ug strikes a piece of glass, it breaks into 7 pieces. Whenever Mug strikes a piece of glass, it breaks into 10 pieces.

Now the big question:
Is there some combination of strikes by the two vandals that will result in there being exactly 2000 pieces of glass?
---
Got some nerve to solve more !!! View More Puzzles : Click here
Or Play while solving puzzles : Click here

Saturday, November 17, 2007

Solution to the 30 Minute Puzzle - Sand watches

Here is the solution for the 30 minutes puzzle using sand watches posted on 10/24/07. Those who havent yet read the problem, first give it a try at 30 Minute Puzzle - Sand watches.
---
Run the 13 minute hourglass.
Then start the 13 minute hourglass and the 9 minute hourglass. After 22 minutes, the 9 minute hourglass will be empty. Start(Invert) it again immediately.
At 26 minutes, the 13 minute hourglass will be empty, and the 9 minute hourglass will have... 5 minutes of sand remaining, and 4 minutes of sand expended.
Immediately turn(invert) the 9 minute hourglass.
This means that at 26 minutes, you now have the 9 minute hourglass with 4 minutes of sand remaining.
This will empty exactly at the 30 minute mark.
---

Friday, November 16, 2007

Clever Inventions to make life easier

Sometimes frustrated, sometimes demanding, sometimes amused.. thinking of why certain things can't be better. What should i do to avoid spoilage , theft , or simply why can't things be easier for even the small things. Lets look at some of the clever inventions that solves those problems. I know you wont be disappointed. Put a comment how you liked it!!!!


CUP & COOKIES

Smart cup in which you can put 2-3 of your favorite cookies. You don't need extra plates. It's made for right handed and left handed.


BANANA GUARD - Protect Your Banana!


Are you fed up with bringing bananas to work or school only to find them bruised and squashed? Banana Guard allows you to safely transport and storage individual bananas letting you enjoy perfect bananas anytime, anywhere.

LOCK-CUP



Lock Cup - Anti-Theft Coffee Cup. Are you tired of others stealing your coffee cup? Well now there's a solution. The Lock - Cup has a hole which prevents most people from using it. Only the owner of the cup can use his/hers shaped key to close the hole.

PENGUIN TEA TIMER


Making tea, though easy to do, is also time consuming. Once you pour the hot water into the cup, you must patiently hover over it, waiting for the tea to steep. Well, the Penguin Tea Timer happily does the waiting for you.
Place your tea cup under the beak and set it to the desired time. As you turn the timer dial, the beak lowers the tea into the hot water. When time is up, a bell sounds and the penguin automatically lifts his beak, removing the tea bag from the water.

TRANSPARENT TOASTER
You love toast, but you always burn it? Then this invention us for you.
This transparent toaster allows you to see the bread while it is toasting so you just have to take it out when the colour is right. This idea is based on a transparent heating glass technology.

BUTTER CUTTER
One Click Butter Cutter controls your portion as an important part of staying healthy. This ingenious butter cutter delivers one standard pat with each click of the handle.

GIANT REMOTE


Never lose your remote again!
With giant buttons, this extra-large remote is easy to use and impossible to lose. It's a 6-in-1 remote so you can use it to control your TV, VCR, DVD player, satellite, cable and auxiliary A/V device. It even features glow-in-the-dark buttons, so you can easily find the remote in the dark.


DAY CLOCK


What day is today? You don't know? Then you need a DayClock. It's uniquely designed to keep track of weekly events like your golf day, card night, movie night, and so much more. It's ideal for vacations and cruises when it's easy to lose track of the day.


LASER SCISSORS

Cutting a straight line has never been easier. Just aim the pin-point laser and follow the line. The scissor blades are stainless steel and cut very clean with a micro serrated edge.

ILUMINATING CAR SLIPPERS


Do you get up at night to drink water, go to the toilet...Do you wish you could see in the dark? Remarkably bright LED lights are triggered by your footsteps and light up the floor 30 feet in front of you; ultra-soft plush style are extra comfortable and cozy warm.

"THE THING" - INFANT PILLOW
The Zaky is an ergonomic infant pillow designed by a mom to mimic the size, weight, touch, and feel of her hand and forearm to help her baby with comfort, support, protection, and development. The Zaky can help calm your baby and help your baby sleep better through the night.

TRAVELER'S PHRASE BOOK T-SHIRT

If you are traveling a lot and don't always know the language of the country you are visiting, then this T-shirt is for you. It has a phrase book printed on it so just point a finger at the pictogram you need and then point it twice at the question mark, which means, "Where is it?" and in no time you have found what you were looking for... or not.

MODERN LADDER
Really cool modern ladder.



LATEST DESIGN WAITER/WAITRESS TRAYS
Anatomic tray, for waiters. No more dropping trays.



WHEEL-MOVING BENCH

Whether you want to sit in the sun or in the shade, near the river or under the tree... now you have your movable bench, to sit wherever you like.


Thats all Folk's

Wednesday, November 14, 2007

Most amazing buildings of the world

We looked at the most amazing roads of the world previously. Here we have few of the most amazing, interesting and strangest buildings / houses of the world. Have a look:

Tbilisi, Georgia
Palace of MarageLooks like a castle but its a place in which Soviet marriage events were held in Tbilisi, Gergia. In Russia and USSR marriage doesnt happen in the church, but in a special house called Palace of The Marage. It is so still nowadays, though after getting married in such place couple can visit a church.
---

State Department for Traffic ,Tbilis (1975)
State Department for Traffic---

Hotel Friendship, Ukraine
Hotel FriendshipBuilt during Soviet era, and was considered by CIA as some strange military object
---

Palace of Soviets, Russia
Palace of SovietsPalace of Soviets built in Kaliningrad city, Russia in 1975. Locals call it A Big Monster

---
Technological Institute,Belarus
Technological Institute Technological Institute in Minsk, Belarus. Was built in 1981 and looks like some white big boat

Sunday, November 11, 2007

Alien Attack Puzzle

Alien Attack Puzzle
There are three Federation Officers assigned to take three hostile aliens to "Peace Talks" on another planet. However, they must follow the following rules:

* They have only one small space ship.
* Only two individuals can ride in the space ship each time.
* All Federation Officers can pilot the space ship, but only one alien can pilot the ship.
* If at any time there are both Federation Officers and aliens on a planet, then there must always be more (or the same number of) Federation Officers than aliens on that planet. This is because if there are more aliens than Federation Officers, then the aliens will kill the Federation Officers. Count any individual in the space ship when it is on one planet as being on that planet.
* The one space ship is the only means of transportation. There is no other way to get to the "Peace Talks". No one can exit the space ship while it is in flight.
* To start off, all the Federation Officers and aliens are on the same planet.

The Question: Can all Federation Officers and aliens get to the other planet alive, and if so: how?

---

Friday, November 9, 2007

Common Conversations in Human Languages

Travel across places, boundaries, countries and continents is now becoming common. English has become a connecting medium for the human race across the planet. But, how would it be to exchange pleasantries with people in their native languages. It sounds real good, to me atleast!

Check out these links:
Now, the big question: How many living human languages do exist? There are many numbers circulating around. As per the sage, there were more than 6000 human spoken languages at one time, but the effective number has now dwindled to 100, and is receding quite fast. With what is termed as Globalization, English has now emerged as the de-facto standard.

Ethnologue is an encyclopedic reference work cataloging all of the world’s 6,912 known living languages. It consists of language maps with country, language codes, language families, primary language names of 7299 languages with a total of 39,491 alternate names.
---

Tuesday, November 6, 2007

Solution to Aristotle's Number Puzzle

This is the solution to Aristotle's Number Puzzle posted on 27th October 2007. For those who haven't tried it yet, first have a look and bash your mind at Aristotle's Number Puzzle .

The other two hats have the values B = 20 and C = 30.

One stumbling block to solving this problem is the fact that, in general, you can't solve it. Or more precisely, in most case, no matter how many chances they are given, A, B and C will not be able to determine their numbers. So keep in mind that there must have been something special about the particular numbers that made it possible in this case. The fact that A was able to solve the problem is a clue as to what the numbers must have been.

Secondly, imagine that A sees that B and C both have a 25 on their hats. Since his number can't be 0 (the numbers were specified to be positive), it must be 50. And he knows this immediately. So we can rule out the case of (50,25,25).

But more importantly, we have discovered a rule. If any player sees the other two players have the same number of their hats, then that player knows immediately that his number is the sum of those numbers, and the game is over.

Now let's assume that the numbers 50, 20 and 30 are correct, and show how A figured out his number.

When A is about to make his first statement, he sees a 20 and a 30. This means his number is either 10 or 50. But he has no other information to go on, hence his statement "I cannot determine my number."

After B and C have spoken, it is A's turn again. Although B and C can't guess, this itself is an important and new piece of information for A. A now knows that there is not enough information for B or C to determine their values. And A now thinks about how this can be possible.

Remember, A knows his value is either 50 or 10. A now examines the consequences if his number is 10. In particular, he imagines the current game from C's perspective.

If A's number was 10, then when it was C's turn to speak, C would realize that his own number must be 10 or 30. But C would also know that B could not guess his own number. However, C would realize, if C's number were 10, then B would have seen two 10's and won the game. And that didn't happen.

Therefore, (still assuming that A's number is 10), and B did not see two 10's. Therefore, C would have realized that his own number cannot be 10, and so must be 30. So if A's number was 10, C would have had enough information to win the game.

But C did not say anything. Therefore, A now realizes that his own number cannot be 10, and that it must be 50. And so A can win the game.

Now, this shows that for the given data (50,20,30), A's answer is reasonable. It does not show that there is no other set of numbers for B and C for which a similar process would allow A to determine his number.

---

Sunday, November 4, 2007

Urn Puzzle

Urn Puzzle
An urn contains 75 white balls and 150 black balls. Next to the urn is a large pile of black balls.

Again and again, someone removes a pair of balls from the urn. If either ball is black, then a black ball is placed on the pile, and the other ball is returned to the urn. If both balls are white, then they are discarded, and a black ball is taken from the pile and returned to the urn.

On every turn, there is one less ball in the urn. What color is the last marble in the urn?
---

Friday, November 2, 2007

Puzzles at Good to Know it !!

Here are all the Puzzles on Thought Process : Good to Know It Blog. The list is updated every weekend!!
---

Thursday, November 1, 2007

Chess Freeze Puzzle

Chess Freeze Puzzle
Norm and Ray were about to sit down to a game of chess when Sally walked in.

"Still playing the same boring game?" she asked, "Let me make it more interesting. I'll set up the pieces on the board a little differently."

"OK," they said, glad to let someone else take care of the chore of setting up the pieces. When they sat down to play, it seemed that only a few pieces were in an unusual position.

"Come on, make your move," said Norm. But when Ray picked up a piece to move, Sally said, "No, that would be illegal."

Ray's brows furrowed for a minute, and then he saw that she was right. He pondered the board for a few more minutes.

"I can't move," he said, "and what's more, neither can you."

How had Sally set up the board?
---

Wednesday, October 31, 2007

Travelling Knight Puzzle

Travelling Knight Puzzle
Place the numbers 1 to 64 in the grid, so that each number is a knight's move away from its neighbour. The numbers 1 and 64 are also a knight's move away from each other. So, for example, the numbers 7 and 9 would each be a knight's move away from number 8.

The letters c and s to the right and below the grid indicate where the cubes and squares are situated.

The following clues will help you place the numbers.

C. Only one number in the twenties.
D. Nothing divisible by 21.
F. Only two numbers in the thirties. Total 210.
G. Three numbers in the thirties.

2. Nothing less than 20.
3. No number in the thirties.
4. Total 214.
6. Nothing divisible by 6 or 11. Only one number in the thirties.
7. Only one number divisible by 10.
8. Only one number divisible by 10.

---

Monday, October 29, 2007

Adultery Puzzle

Adultery Puzzle
On a certain island with 500 married couples. In exactly 50 of those couples, the husband is committing adultery. The way gossip works on this island, everyone is very polite, so no one will tell a wife that her husband is committing adultery, but they will certainly tell her about all the other husbands. So let us suppose that every wife of a cheating husband knows about the other cheating husbands, but not her own.

One day, the executioner appears in the town square and says, "Any wife who suspects her husband of cheating shall bring him to me today!" But no one brings a husband forth. The next day, the executioner shows up again, but no husband is brought forth. The executioner is stubborn, and so he comes every day. Is justice ever done?
---

Sunday, October 28, 2007

Amazing Roads of the World

Here we have the most amazing roads of the world. Take a look:

http://goodtoknowit.blogspot.com
http://goodtoknowit.blogspot.com
http://goodtoknowit.blogspot.com
http://goodtoknowit.blogspot.com
http://goodtoknowit.blogspot.comhttp://goodtoknowit.blogspot.com
http://goodtoknowit.blogspot.comhttp://goodtoknowit.blogspot.com
---

Saturday, October 27, 2007

Aristotle's Number Puzzle

Archimedes, Boole, and Chebyshev, three perfectly wise thinkers, each has a hat on his head, on which is written some positive integer. The host then announces that the number on one of the hats is the sum of the numbers on the other two hats. The following statements are made:

1. Aristotle: I cannot determine my number.
2. Boole: I still cannot determine my number.
3. Chebyshev: I also still cannot determine my number.
4. Aristotle: My number is 50.

Aristotle is correct. From this fact, and from the four remarks, can you determine how Aristotle determined his number, and what the numbers on the other two hats were?
---

Friday, October 26, 2007

Color Coded Cards Puzzle

Color Coded Cards Puzzle
Nine cards, each of a different color and each with a different digit 1 - 9 have been arranged in a circle. All except the gray card are between an odd digit and an even digit.
The hazel, indigo, jade and khaki cards are consecutive in that order clockwise around the circle, with the digits on the first three adding to give the digit on the fourth. The lime, magenta and navy cards are consecutive in that order clockwise around the circle, with the digits on the first two summing to give twice the digit on the third.
There is also an orange card. In some cases the digit on a card equals the sum of the digits on the neighboring two cards. The number of occurrences of this situation is the digit on the hazel card.
Starting with the "1", what are the numbers on, and colors of, the cards, clockwise around the circle?
---

Wednesday, October 24, 2007

30 Minute Puzzle - Sand watches

30 Minute Puzzle
Here is another riddle like we earlier had with the Burning Rope timer with a different concept and sure a good one!!
Lets move right away to the brain teaser:
You are given two "hourglasses(sand watches)", one of which will empty in 9 minutes, and one in 13 minutes. You need to measure a time interval of exactly 30 minutes. Is it possible?

---

Monday, October 22, 2007

Santa's Reindeer Puzzle

Santa always leaves plans for his elves to determine the order in which the reindeer will pull his sleigh. This year, for the European leg of his journey, his elves are working to the following schedule, that will form a single line of nine reindeer:

Comet behind Rudolph, Prancer and Cupid. Blitzen behind Cupid and in front of Donder, Vixen and Dancer. Cupid in front of Comet, Blitzen and Vixen. Donder behind Vixen, Dasher and Prancer. Rudolph behind Prancer and in front of Donder, Dancer and Dasher. Vixen in front of Dancer and Comet. Dancer behind Donder, Rudolph and Blitzen. Prancer in front of Cupid, Donder and Blitzen. Dasher behind Prancer and in front of Vixen, Dancer and Blitzen. Donder behind Comet and Cupid. Cupid in front of Rudolph and Dancer. Vixen behind Rudolph, Prancer and Dasher.

Can you help the elves work out the order of the reindeer?

---

Sunday, October 21, 2007

The Spiral Puzzle

THE SPIRAL PUZZLE

At a lumber mill, some logs are processed through a machine that essentially pares away the wood in a continuous spiral sheet, almost as though the log had been a roll of wrapping paper.

A certain amount of wood is wasted during the cutting process, especially if the sheet tears and the cutting process has to be restarted. Another source of waste occurs because the process must be terminated before the log is completely "unwrapped", leaving a scraggly pole that is tossed into the scrap bin.

An efficiency-minded manager believes that the amount of wood wasted in this process is as much as 25 percent. He is interested in confirming his guess by having you give a reasonable estimate of what the process would look like if it worked perfectly.

So suppose we begin with a log that is a perfect cylinder, 10 feet long, and 4 feet thick, and that we wish to spiral cut it into a continuous sheet that is 1/4 inch thick. We may assume that the sheet can be flattened, although it actually has some curvature that increases dramatically as the cut approaches the center of the log. Let us also assume that, in the messy rough and tumble of a lumber mill, it is typical to get several 1/4 inch thick sheets of wood that are equivalent to one sheet that is about 120 feet in length from this log.

The first question is, can you estimate or compute exactly the length of the sheet of wood you could cut from the log in a perfect mathematical process? It would be satisfactory to compute the length of a spiral line that represents the position of the cutting blade.

Secondly, believe it or not, the more formulas you write, the less some people believe you. Can you think of a simple way of getting a good estimate of the length of the sheet of wood that involves nothing more than arithmetic and geometry?

---

Tuesday, October 16, 2007

Multiplication Redesigned - the picky peppy trick

I had a great fall over this tip when i tried it out. Particularly, making mathematically handicapped people do good enough and of no reason it works very well. Lets look out for this.
It is from an obituary by Morton White for the great philosopher and mathematician Willard Van Orman Quine.

White tells the following story about Quine: Upon hearing that White's son Steve was not taught multiplication properly due to a switch in school districts, Quine sent him a letter with the following passage:
Since Stevie misses multiplication, he may enjoy gorging on this one. Well, so you have these two numbers, see, and you want to multiply one of them by the other. O. K., so you write them down more or less side by side, as potential headings of two potentially parallel potential columns, roughly thus:

19 27

Then you go to work on the left one, cutting it in half. Write the half underneath. No fractions, though. If it was odd, just forget the fraction. If it was 58 .. 537, just put down 29 .. 268 as its half. That's near enough. Then, under that in turn, put its half (ignoring, again, the fraction if any); and so on, until you get down to 1. That completes your left-hand column.

19 27
9
4
2
1

Then go to work on the right-hand number, making a column under it by exactly the opposite method: doubling each time. This could go on forever, but don't let it. Keep your right-hand column lined up with your left-hand column, entry by entry, and stop as soon as you are opposite the bottom of your left-hand column.

19 27
9 54
4 108
2 216
1 432

O. K., so now you have the two columns side by side. The next thing to do is to start in on the right-hand column and cross out a lot of it. Cross out all the entries which have even numbers opposite them in the left-hand column. Keep only those entries in the right-hand column which have odd numbers opposite them in the left-hand column. All right, now add up the right-hand column, what's left of it after all the crossing out. The result, unless I have made a mistake somewhere, is the answer to your original multiplication problem.

19 27
9 54
4 108 [XXXed out]
2 216 [XXXed out]
1 432
—–
513 [19 * 27 = 513]

It may be that this information reaches Stevie a bit too late to be altogether useful. If I had tipped him off earlier, he would never had [sic] had to learn the multiplication table.

The algorithm actually works, which you will see if you play around with it. And indeed, although certain aspects of the storytelling are played up to make it seem like magic, after a little study it becomes clear (even to someone as mathematically handicapped as I am) why it works. If you like this sort of thing, it is fun to figure out.

Do any readers know who first invented this trick?
---

Monday, October 15, 2007

Technorati Favorites

Technorati Favorites Exchange is one of the best experiment going on in between all bloggers and they are exchanging technorati favorites to increase traffic to their blogs and get more exposer around the blogsphere .
how this will help : - We know that technorati has maintained his own top 100 favorited blogs list and those blogs within this list get nice traffic from that . Example : when you login to your technorati account you see all latest post from your blog and from your favourited blogs . Now think if 100 blogs has added you as favorite than your post will be published to 100 account and your blog traffic will also increase .
How to take part in this experiment : First add Digitalmail to you favorite list from this link : Add to technorati Favourites .

2. After adding me you can leave comment on my blog with you technorati favourite link and i will also add you in my technorati favorite list .

3. You can ask other bloggers to exchange technorati favorite to increase you blog popularity .Also visit these blog to add them into your list Technospot.net .you can also create one post like this and invite as many as friend you can to take part in this Technorati Experiment .
---
-taken from Me and my net

Wednesday, October 10, 2007

Solution to 100 Lockers Puzzle

Solution to the 100 Lockers Puzzle.
Those who haven't seen the puzzle yet, give it a try at 100 Lockers Puzzle
Student 1 opens all the lockers and Student 2 goes and closes every second locker
and so on... means
Locker 1: No one change the state of 1st locker except student 1 so it is in opened state.
Locker 2: Student 1 opens and Student 2 closes.
Locker 3: Student 1 opens and Student 3 closes.
Locker 4: Student 1 opens, Student 2 closes and Student 4 Opens.
. . .
This is very tedious approach and no one likes to do this physical exercise.

But by observing clearly we can conclude
Locker 1 state can be changed by one student,
Locker 2 state can be changed by two students,
Locker 3 state can be changed by two students,
Locker 4 state can be changed by three students, ...
which clearly clarifies that the Lockers are Opened only by the Odd number of students.

We can get the count of students who are going to the particular locker by finding the factors of that locker.

If we get odd number of factors then that locker is in Opened State.
For Example:
Locker 9 has factors {1,3,9} -> odd count, so it is in opened state.
So there are 10 Lockers which has an odd count. And they are {1, 4, 9, 16, 25, 36, 49, 64, 81, 100}.

Another simple way to get how many lockers has an odd number of factors. That is by just calculating the perfect squares from 1 to 100. So, they are nothing but {1, 4, 9, 16, 25, 36, 49, 64, 81, 100}.
---

Sunday, October 7, 2007

Most Interactive Billboard - A Genius Idea, Vertical Soccer

The best of so called "Ambient Billboards". Ever seen soccer played vertically??. Must have seen too many billboards that looks interacting with backgrounds and felt them great. But this one is a piece of art. A work of true genius.
The more the creativity in the advertisement more is the number of people attracted. And this is what is called as Brand building.
Look at the following billboard. The billboard is actually blank. It is made of 12,148 aluminum pegs each varying from a length of 1mm to 27mm. Having different length causes different length shadows for the pegs. Now comes the genius part.

The shadows creates a greyscale image of a woman sunbathing as the sun comes out.
Changing direction from morning to evening.


That was static, yeah , not exactly.
Now comes another real time biggie Adidas. The billboard that stunned all the bystanders. Come on take a look . See what they are doing, how they are doing. The billboard was on air in a few minutes time. They are playing soccer on a billboard, yeah VERTICAL SOCCER. Simply amazing. This gave a hell lot of publicity to Adidas.



Wondering who would have thought about that idea!! And who agreed to implement it!!
Truly great!!
---

Friday, October 5, 2007

Solution to Empty the Bucket Puzzle

This is the solution for the Puzzle --Empty the Bucket Puzzle .

For those who haven't tried the puzzle. First give it a try at Empty the Bucket Puzzle

First observe that a very special thing happens when you work with just two buckets, where one has an even quantity and one has an odd quantity. Because there are just two unequal buckets, there's just one move possible: Pour water from the bucket with more water into the bucket with less water. Note that the move preserves the property that one bucket is even and the other one is odd.

What happens if we just keep doing this? Since there are a finite number of states, we must eventually repeat a state we've seen before. In fact, the first repeated state must be the original configuration. This is because for any configuration in this sequence, there is a unique prior one -- it's the one obtained by moving half of the even bucket's water to the odd bucket.

If the cycle is of length n, then by making n-1 moves, we reach the state "preceeding" the initial one. So if we were in the state (a,b), where a is even and b is odd, then we can get to the state (a/2, b+a/2).

With this under our belt, let's look at a little more general case. Suppose one of the buckets has an odd quantity of water, and the other two have an even quantity of water. Call this the odd-even-even case. We'll show how to increase the size of the odd bucket, while preserving the evenness of the other two. Eventually one of the even buckets must be empty. Let the quantity of water in the buckets be (a, b, c) where a is odd and b and c are even. First if neither b nor c are a multiple of 4, then make one move among them so that one of them is a multiple of 4. Now, by relabeling buckets we can assume without loss of generality that we have three buckets (a, b, c), where a is odd b is a multiple of 4, and c is even. Now we make a backwards move between a and b. The three buckets are now (a+b/2, b/2, c). We still have one odd and two even buckets, and we've grown the odd bucket. By repeating this algorithm one of the even buckets must eventually become empty. This solves the odd-even-even case.

What about the rest of the cases? The odd-odd-odd case becomes odd-even-even (solved above) after any move is made. The other cases are proven by induction. In the even-even-even case we simply divide all the bucket sizes by 2 and solve the smaller problem. The even-odd-odd case is solved by first making a move among the two odd buckets, which leads to the (already solved) even-even-even case.

---

Thursday, October 4, 2007

Phobia

Phobia as defined by Wikipedia: A phobia is a strong, persistent fear of situations, objects, activities, or persons. The main symptom of this disorder is the excessive, unreasonable desire to avoid the feared subject. When the fear is beyond one's control, or if the fear is interfering with daily life, then a diagnosis under one of the anxiety disorders can be made.

Now guess how many different types of phobia are classified. 10, 50, 100... no there are 533 different phobias currently documented. Check this out,

Ablutophobia- Fear of washing or bathing.
Acarophobia- Fear of itching or of the insects that cause itching.
Acerophobia- Fear of sourness.
Achluophobia- Fear of darkness.
Acousticophobia- Fear of noise.
Acrophobia- Fear of heights.
Aerophobia- Fear of drafts, air swallowing, or airbourne noxious substances.
Aeroacrophobia- Fear of open high places.
Aeronausiphobia- Fear of vomiting secondary to airsickness.
Agateophobia- Fear of insanity.
Agliophobia- Fear of pain.
Agoraphobia- Fear of open spaces or of being in crowded, public places like markets. Fear of leaving a safe place.
Agraphobia- Fear of sexual abuse.
Agrizoophobia- Fear of wild animals.
Agyrophobia- Fear of streets or crossing the street.
Aichmophobia- Fear of needles or pointed objects.
Ailurophobia- Fear of cats.
Albuminurophobia- Fear of kidney disease.
Alektorophobia- Fear of chickens.
Algophobia- Fear of pain.
Alliumphobia- Fear of garlic.
Allodoxaphobia- Fear of opinions.
Altophobia- Fear of heights.
Amathophobia- Fear of dust.
Amaxophobia- Fear of riding in a car.
Ambulophobia- Fear of walking.
Amnesiphobia- Fear of amnesia.
Amychophobia- Fear of scratches or being scratched.
Anablephobia- Fear of looking up.
Ancraophobia- Fear of wind. (Anemophobia)
Androphobia- Fear of men.
Anemophobia- Fear of air drafts or wind.(Ancraophobia)
Anginophobia- Fear of angina, choking or narrowness.
Anglophobia- Fear of England or English culture, etc.
Angrophobia - Fear of anger or of becoming angry.
Ankylophobia- Fear of immobility of a joint.
Anthrophobia or Anthophobia- Fear of flowers.
Anthropophobia- Fear of people or society.
Antlophobia- Fear of floods.
Anuptaphobia- Fear of staying single.
Apeirophobia- Fear of infinity.
Aphenphosmphobia- Fear of being touched. (Haphephobia)
Apiphobia- Fear of bees.
Apotemnophobia- Fear of persons with amputations.
Arachibutyrophobia- Fear of peanut butter sticking to the roof of the mouth.
Arachnephobia or Arachnophobia- Fear of spiders.
Arithmophobia- Fear of numbers.
Arrhenphobia- Fear of men.
Arsonphobia- Fear of fire.
Asthenophobia- Fear of fainting or weakness.
Astraphobia or Astrapophobia- Fear of thunder and lightning.(Ceraunophobia, Keraunophobia)
Astrophobia- Fear of stars or celestial space.
Asymmetriphobia- Fear of asymmetrical things.
Ataxiophobia- Fear of ataxia. (muscular incoordination)
Ataxophobia- Fear of disorder or untidiness.
Atelophobia- Fear of imperfection.
Atephobia- Fear of ruin or ruins.
Athazagoraphobia- Fear of being forgotton or ignored or forgetting.
Atomosophobia- Fear of atomic explosions.
Atychiphobia- Fear of failure.
Aulophobia- Fear of flutes.
Aurophobia- Fear of gold.
Auroraphobia- Fear of Northern lights.
Autodysomophobia- Fear of one that has a vile odor.
Automatonophobia- Fear of ventriloquist's dummies, animatronic creatures, wax statues - anything that falsly represents a sentient being.
Automysophobia- Fear of being dirty.
Autophobia- Fear of being alone or of oneself.
Aviophobia or Aviatophobia- Fear of flying.

Bacillophobia- Fear of microbes.
Bacteriophobia- Fear of bacteria.
Ballistophobia- Fear of missiles or bullets.
Bolshephobia- Fear of Bolsheviks.
Barophobia- Fear of gravity.
Basophobia or Basiphobia- Inability to stand. Fear of walking or falling.
Bathmophobia- Fear of stairs or steep slopes.
Bathophobia- Fear of depth.
Batophobia- Fear of heights or being close to high buildings.
Batrachophobia- Fear of amphibians, such as frogs, newts, salamanders, etc.
Belonephobia- Fear of pins and needles. (Aichmophobia)
Bibliophobia- Fear of books.
Blennophobia- Fear of slime.
Bogyphobia- Fear of bogeys or the bogeyman.
Botanophobia- Fear of plants.
Bromidrosiphobia or Bromidrophobia- Fear of body smells.
Brontophobia- Fear of thunder and lightning.
Bufonophobia- Fear of toads.

Cacophobia- Fear of ugliness.
Cainophobia or Cainotophobia- Fear of newness, novelty.
Caligynephobia- Fear of beautiful women.
Cancerophobia or Carcinophobia- Fear of cancer.
Cardiophobia- Fear of the heart.
Carnophobia- Fear of meat.
Catagelophobia- Fear of being ridiculed.
Catapedaphobia- Fear of jumping from high and low places.
Cathisophobia- Fear of sitting.
Catoptrophobia- Fear of mirrors.
Cenophobia or Centophobia- Fear of new things or ideas.
Ceraunophobia or Keraunophobia- Fear of thunder and lightning.(Astraphobia, Astrapophobia)
Chaetophobia- Fear of hair.
Cheimaphobia or Cheimatophobia- Fear of cold.(Frigophobia, Psychophobia)
Chemophobia- Fear of chemicals or working with chemicals.
Cherophobia- Fear of gaiety.
Chionophobia- Fear of snow.
Chiraptophobia- Fear of being touched.
Chirophobia- Fear of hands.
Cholerophobia- Fear of anger or the fear of cholera.
Chorophobia- Fear of dancing.
Chrometophobia or Chrematophobia- Fear of money.
Chromophobia or Chromatophobia- Fear of colors.
Chronophobia- Fear of time.
Chronomentrophobia- Fear of clocks.
Cibophobia- Fear of food.(Sitophobia, Sitiophobia)
Claustrophobia- Fear of confined spaces.
Cleithrophobia or Cleisiophobia- Fear of being locked in an enclosed place.
Cleptophobia- Fear of stealing.
Climacophobia- Fear of stairs, climbing, or of falling downstairs.
Clinophobia- Fear of going to bed.
Clithrophobia or Cleithrophobia- Fear of being enclosed.
Cnidophobia- Fear of stings.
Cometophobia- Fear of comets.
Coimetrophobia- Fear of cemeteries.
Coitophobia- Fear of coitus.
Contreltophobia- Fear of sexual abuse.
Coprastasophobia- Fear of constipation.
Coprophobia- Fear of feces.
Consecotaleophobia- Fear of chopsticks.
Coulrophobia- Fear of clowns.
Counterphobia- The preference by a phobic for fearful situations.
Cremnophobia- Fear of precipices.
Cryophobia- Fear of extreme cold, ice or frost.
Crystallophobia- Fear of crystals or glass.
Cyberphobia- Fear of computers or working on a computer.
Cyclophobia- Fear of bicycles.
Cymophobia or Kymophobia- Fear of waves or wave like motions.
Cynophobia- Fear of dogs or rabies.
Cypridophobia or Cypriphobia or Cyprianophobia or Cyprinophobia - Fear of prostitutes or venereal disease.

Decidophobia- Fear of making decisions.
Defecaloesiophobia- Fear of painful bowels movements.
Deipnophobia- Fear of dining or dinner conversations.
Dementophobia- Fear of insanity.
Demonophobia or Daemonophobia- Fear of demons.
Demophobia- Fear of crowds. (Agoraphobia)
Dendrophobia- Fear of trees.
Dentophobia- Fear of dentists.
Dermatophobia- Fear of skin lesions.
Dermatosiophobia or Dermatophobia or Dermatopathophobia- Fear of skin disease.
Dextrophobia- Fear of objects at the right side of the body.
Diabetophobia- Fear of diabetes.
Didaskaleinophobia- Fear of going to school.
Dikephobia- Fear of justice.
Dinophobia- Fear of dizziness or whirlpools.
Diplophobia- Fear of double vision.
Dipsophobia- Fear of drinking.
Dishabiliophobia- Fear of undressing in front of someone.
Domatophobia- Fear of houses or being in a house.(Eicophobia, Oikophobia)
Doraphobia- Fear of fur or skins of animals.
Doxophobia- Fear of expressing opinions or of receiving praise.
Dromophobia- Fear of crossing streets.
Dutchphobia- Fear of the Dutch.
Dysmorphophobia- Fear of deformity.
Dystychiphobia- Fear of accidents.

Ecclesiophobia- Fear of church.
Ecophobia- Fear of home.
Eicophobia- Fear of home surroundings.(Domatophobia, Oikophobia)
Eisoptrophobia- Fear of mirrors or of seeing oneself in a mirror.
Electrophobia- Fear of electricity.
Eleutherophobia- Fear of freedom.
Elurophobia- Fear of cats. (Ailurophobia)
Emetophobia- Fear of vomiting.
Enetophobia- Fear of pins.
Enochlophobia- Fear of crowds.
Enosiophobia or Enissophobia- Fear of having committed an unpardonable sin or of criticism.
Entomophobia- Fear of insects.
Eosophobia- Fear of dawn or daylight.
Ephebiphobia- Fear of teenagers.
Epistaxiophobia- Fear of nosebleeds.
Epistemophobia- Fear of knowledge.
Equinophobia- Fear of horses.
Eremophobia- Fear of being oneself or of lonliness.
Ereuthrophobia- Fear of blushing.
Ergasiophobia- 1) Fear of work or functioning. 2) Surgeon's fear of operating.
Ergophobia- Fear of work.
Erotophobia- Fear of sexual love or sexual questions.
Euphobia- Fear of hearing good news.
Eurotophobia- Fear of female genitalia.
Erythrophobia or Erytophobia or Ereuthophobia- 1) Fear of redlights. 2) Blushing. 3) Red.

Febriphobia or Fibriphobia or Fibriophobia- Fear of fever.
Felinophobia- Fear of cats. (Ailurophobia, Elurophobia, Galeophobia, Gatophobia)
Francophobia- Fear of France or French culture. (Gallophobia, Galiophobia)
Frigophobia- Fear of cold or cold things.(Cheimaphobia, Cheimatophobia, Psychrophobia)

Galeophobia or Gatophobia- Fear of cats.
Gallophobia or Galiophobia- Fear France or French culture. (Francophobia)
Gamophobia- Fear of marriage.
Geliophobia- Fear of laughter.
Geniophobia- Fear of chins.
Genophobia- Fear of sex.
Genuphobia- Fear of knees.
Gephyrophobia or Gephydrophobia or Gephysrophobia- Fear of crossing bridges.
Germanophobia- Fear of Germany or German culture.
Gerascophobia- Fear of growing old.
Gerontophobia- Fear of old people or of growing old.
Geumaphobia or Geumophobia- Fear of taste.
Glossophobia- Fear of speaking in public or of trying to speak.
Gnosiophobia- Fear of knowledge.
Graphophobia- Fear of writing or handwriting.
Gymnophobia- Fear of nudity.
Gynephobia or Gynophobia- Fear of women.

Hadephobia- Fear of hell.
Hagiophobia- Fear of saints or holy things.
Hamartophobia- Fear of sinning.
Haphephobia or Haptephobia- Fear of being touched.
Harpaxophobia- Fear of being robbed.
Hedonophobia- Fear of feeling pleasure.
Heliophobia- Fear of the sun.
Hellenologophobia- Fear of Greek terms or complex scientific terminology.
Helminthophobia- Fear of being infested with worms.
Hemophobia or Hemaphobia or Hematophobia- Fear of blood.
Heresyphobia or Hereiophobia- Fear of challenges to official doctrine or of radical deviation.
Herpetophobia- Fear of reptiles or creepy, crawly things.
Heterophobia- Fear of the opposite sex. (Sexophobia)
Hexakosioihexekontahexaphobia- Fear of the number 666.
Hierophobia- Fear of priests or sacred things.
Hippophobia- Fear of horses.
Hippopotomonstrosesquippedaliophobia- Fear of long words.
Hobophobia- Fear of bums or beggars.
Hodophobia- Fear of road travel.
Hormephobia- Fear of shock.
Homichlophobia- Fear of fog.
Homilophobia- Fear of sermons.
Hominophobia- Fear of men.
Homophobia- Fear of sameness, monotony or of homosexuality or of becoming homosexual.
Hoplophobia- Fear of firearms.
Hydrargyophobia- Fear of mercurial medicines.
Hydrophobia- Fear of water or of rabies.
Hydrophobophobia- Fear of rabies.
Hyelophobia or Hyalophobia- Fear of glass.
Hygrophobia- Fear of liquids, dampness, or moisture.
Hylephobia- Fear of materialism or the fear of epilepsy.
Hylophobia- Fear of forests.
Hypengyophobia or Hypegiaphobia- Fear of responsibility.
Hypnophobia- Fear of sleep or of being hypnotized.
Hypsiphobia- Fear of height.

Iatrophobia- Fear of going to the doctor or of doctors.
Ichthyophobia- Fear of fish.
Ideophobia- Fear of ideas.
Illyngophobia- Fear of vertigo or feeling dizzy when looking down.
Iophobia- Fear of poison.
Insectophobia - Fear of insects.
Isolophobia- Fear of solitude, being alone.
Isopterophobia- Fear of termites, insects that eat wood.
Ithyphallophobia- Fear of seeing, thinking about or having an erect penis.

Japanophobia- Fear of Japanese.
Judeophobia- Fear of Jews.

Kainolophobia or Kainophobia- Fear of anything new, novelty.
Kakorrhaphiophobia- Fear of failure or defeat.
Katagelophobia- Fear of ridicule.
Kathisophobia- Fear of sitting down.
Kenophobia- Fear of voids or empty spaces.
Keraunophobia or Ceraunophobia- Fear of thunder and lightning.(Astraphobia, Astrapophobia)
Kinetophobia or Kinesophobia- Fear of movement or motion.
Kleptophobia- Fear of stealing.
Koinoniphobia- Fear of rooms.
Kolpophobia- Fear of genitals, particularly female.
Kopophobia- Fear of fatigue.
Koniophobia- Fear of dust. (Amathophobia)
Kosmikophobia- Fear of cosmic phenomenon.
Kymophobia- Fear of waves. (Cymophobia)
Kynophobia- Fear of rabies.
Kyphophobia- Fear of stooping.

Lachanophobia- Fear of vegetables.
Laliophobia or Lalophobia- Fear of speaking.
Leprophobia or Lepraphobia- Fear of leprosy.
Leukophobia- Fear of the color white.
Levophobia- Fear of things to the left side of the body.
Ligyrophobia- Fear of loud noises.
Lilapsophobia- Fear of tornadoes and hurricanes.
Limnophobia- Fear of lakes.
Linonophobia- Fear of string.
Liticaphobia- Fear of lawsuits.
Lockiophobia- Fear of childbirth.
Logizomechanophobia- Fear of computers.
Logophobia- Fear of words.
Luiphobia- Fear of lues, syphillis.
Lutraphobia- Fear of otters.
Lygophobia- Fear of darkness.
Lyssophobia- Fear of rabies or of becoming mad.

Macrophobia- Fear of long waits.
Mageirocophobia- Fear of cooking.
Maieusiophobia- Fear of childbirth.
Malaxophobia- Fear of love play. (Sarmassophobia)
Maniaphobia- Fear of insanity.
Mastigophobia- Fear of punishment.
Mechanophobia- Fear of machines.
Medomalacuphobia- Fear of losing an erection.
Medorthophobia- Fear of an erect penis.
Megalophobia- Fear of large things.
Melissophobia- Fear of bees.
Melanophobia- Fear of the color black.
Melophobia- Fear or hatred of music.
Meningitophobia- Fear of brain disease.
Menophobia- Fear of menstruation.
Merinthophobia- Fear of being bound or tied up.
Metallophobia- Fear of metal.
Metathesiophobia- Fear of changes.
Meteorophobia- Fear of meteors.
Methyphobia- Fear of alcohol.
Metrophobia- Fear or hatred of poetry.
Microbiophobia- Fear of microbes. (Bacillophobia)
Microphobia- Fear of small things.
Misophobia or Mysophobia- Fear of being contaminated with dirt or germs.
Mnemophobia- Fear of memories.
Molysmophobia or Molysomophobia- Fear of dirt or contamination.
Monophobia- Fear of solitude or being alone.
Monopathophobia- Fear of definite disease.
Motorphobia- Fear of automobiles.
Mottephobia- Fear of moths.
Musophobia or Muriphobia- Fear of mice.
Mycophobia- Fear or aversion to mushrooms.
Mycrophobia- Fear of small things.
Myctophobia- Fear of darkness.
Myrmecophobia- Fear of ants.
Mythophobia- Fear of myths or stories or false statements.
Myxophobia- Fear of slime. (Blennophobia)

Nebulaphobia- Fear of fog. (Homichlophobia)
Necrophobia- Fear of death or dead things.
Nelophobia- Fear of glass.
Neopharmaphobia- Fear of new drugs.
Neophobia- Fear of anything new.
Nephophobia- Fear of clouds.
Noctiphobia- Fear of the night.
Nomatophobia- Fear of names.
Nosocomephobia- Fear of hospitals.
Nosophobia or Nosemaphobia- Fear of becoming ill.
Nostophobia- Fear of returning home.
Novercaphobia- Fear of your step-mother.
Nucleomituphobia- Fear of nuclear weapons.
Nudophobia- Fear of nudity.
Numerophobia- Fear of numbers.
Nyctohylophobia- Fear of dark wooded areas or of forests at night
Nyctophobia- Fear of the dark or of night.

Obesophobia- Fear of gaining weight.(Pocrescophobia)
Ochlophobia- Fear of crowds or mobs.
Ochophobia- Fear of vehicles.
Octophobia - Fear of the figure 8.
Odontophobia- Fear of teeth or dental surgery.
Odynophobia or Odynephobia- Fear of pain. (Algophobia)
Oenophobia- Fear of wines.
Oikophobia- Fear of home surroundings, house.(Domatophobia, Eicophobia)
Olfactophobia- Fear of smells.
Ombrophobia- Fear of rain or of being rained on.
Ommetaphobia or Ommatophobia- Fear of eyes.
Oneirophobia- Fear of dreams.
Oneirogmophobia- Fear of wet dreams.
Onomatophobia- Fear of hearing a certain word or of names.
Ophidiophobia- Fear of snakes. (Snakephobia)
Ophthalmophobia- Fear of being stared at.
Opiophobia- Fear medical doctors experience of prescribing needed pain medications for patients.
Optophobia- Fear of opening one's eyes.
Ornithophobia- Fear of birds.
Orthophobia- Fear of property.
Osmophobia or Osphresiophobia- Fear of smells or odors.
Ostraconophobia- Fear of shellfish.
Ouranophobia or Uranophobia- Fear of heaven.

Pagophobia- Fear of ice or frost.
Panthophobia- Fear of suffering and disease.
Panophobia or Pantophobia- Fear of everything.
Papaphobia- Fear of the Pope.
Papyrophobia- Fear of paper.
Paralipophobia- Fear of neglecting duty or responsibility.
Paraphobia- Fear of sexual perversion.
Parasitophobia- Fear of parasites.
Paraskavedekatriaphobia- Fear of Friday the 13th.
Parthenophobia- Fear of virgins or young girls.
Pathophobia- Fear of disease.
Patroiophobia- Fear of heredity.
Parturiphobia- Fear of childbirth.
Peccatophobia- Fear of sinning or imaginary crimes.
Pediculophobia- Fear of lice.
Pediophobia- Fear of dolls.
Pedophobia- Fear of children.
Peladophobia- Fear of bald people.
Pellagrophobia- Fear of pellagra.
Peniaphobia- Fear of poverty.
Pentheraphobia- Fear of mother-in-law. (Novercaphobia)
Phagophobia- Fear of swallowing or of eating or of being eaten.
Phalacrophobia- Fear of becoming bald.
Phallophobia- Fear of a penis, esp erect.
Pharmacophobia- Fear of taking medicine.
Phasmophobia- Fear of ghosts.
Phengophobia- Fear of daylight or sunshine.
Philemaphobia or Philematophobia- Fear of kissing.
Philophobia- Fear of falling in love or being in love.
Philosophobia- Fear of philosophy.
Phobophobia- Fear of phobias.
Photoaugliaphobia- Fear of glaring lights.
Photophobia- Fear of light.
Phonophobia- Fear of noises or voices or one's own voice; of telephones.
Phronemophobia- Fear of thinking.
Phthiriophobia- Fear of lice. (Pediculophobia)
Phthisiophobia- Fear of tuberculosis.
Placophobia- Fear of tombstones.
Plutophobia- Fear of wealth.
Pluviophobia- Fear of rain or of being rained on.
Pneumatiphobia- Fear of spirits.
Pnigophobia or Pnigerophobia- Fear of choking of being smothered.
Pocrescophobia- Fear of gaining weight. (Obesophobia)
Pogonophobia- Fear of beards.
Poliosophobia- Fear of contracting poliomyelitis.
Politicophobia- Fear or abnormal dislike of politicians.
Polyphobia- Fear of many things.
Poinephobia- Fear of punishment.
Ponophobia- Fear of overworking or of pain.
Porphyrophobia- Fear of the color purple.
Potamophobia- Fear of rivers or running water.
Potophobia- Fear of alcohol.
Pharmacophobia- Fear of drugs.
Proctophobia- Fear of rectums.
Prosophobia- Fear of progress.
Psellismophobia- Fear of stuttering.
Psychophobia- Fear of mind.
Psychrophobia- Fear of cold.
Pteromerhanophobia- Fear of flying.
Pteronophobia- Fear of being tickled by feathers.
Pupaphobia - Fear of puppets.
Pyrexiophobia- Fear of Fever.
Pyrophobia- Fear of fire.

Radiophobia- Fear of radiation, x-rays.
Ranidaphobia- Fear of frogs.
Rectophobia- Fear of rectum or rectal diseases.
Rhabdophobia- Fear of being severely punished or beaten by a rod, or of being severely criticized. Also fear of magic.(wand)
Rhypophobia- Fear of defecation.
Rhytiphobia- Fear of getting wrinkles.
Rupophobia- Fear of dirt.
Russophobia- Fear of Russians.

Samhainophobia: Fear of Halloween.
Sarmassophobia- Fear of love play. (Malaxophobia)
Satanophobia- Fear of Satan.
Scabiophobia- Fear of scabies.
Scatophobia- Fear of fecal matter.
Scelerophibia- Fear of bad men, burglars.
Sciophobia Sciaphobia- Fear of shadows.
Scoleciphobia- Fear of worms.
Scolionophobia- Fear of school.
Scopophobia or Scoptophobia- Fear of being seen or stared at.
Scotomaphobia- Fear of blindness in visual field.
Scotophobia- Fear of darkness. (Achluophobia)
Scriptophobia- Fear of writing in public.
Selachophobia- Fear of sharks.
Selaphobia- Fear of light flashes.
Selenophobia- Fear of the moon.
Seplophobia- Fear of decaying matter.
Sesquipedalophobia- Fear of long words.
Sexophobia- Fear of the opposite sex. (Heterophobia)
Siderodromophobia- Fear of trains, railroads or train travel.
Siderophobia- Fear of stars.
Sinistrophobia- Fear of things to the left or left-handed.
Sinophobia- Fear of Chinese, Chinese culture.
Sitophobia or Sitiophobia- Fear of food or eating. (Cibophobia)
Snakephobia- Fear of snakes. (Ophidiophobia)
Soceraphobia- Fear of parents-in-law.
Social Phobia- Fear of being evaluated negatively in social situations.
Sociophobia- Fear of society or people in general.
Somniphobia- Fear of sleep.
Sophophobia- Fear of learning.
Soteriophobia - Fear of dependence on others.
Spacephobia- Fear of outer space.
Spectrophobia- Fear of specters or ghosts.
Spermatophobia or Spermophobia- Fear of germs.
Spheksophobia- Fear of wasps.
Stasibasiphobia or Stasiphobia- Fear of standing or walking. (Ambulophobia)
Staurophobia- Fear of crosses or the crucifix.
Stenophobia- Fear of narrow things or places.
Stygiophobia or Stigiophobia- Fear of hell.
Suriphobia- Fear of mice.
Symbolophobia- Fear of symbolism.
Symmetrophobia- Fear of symmetry.
Syngenesophobia- Fear of relatives.
Syphilophobia- Fear of syphilis.

Tachophobia- Fear of speed.
Taeniophobia or Teniophobia- Fear of tapeworms.
Taphephobia Taphophobia- Fear of being buried alive or of cemeteries.
Tapinophobia- Fear of being contagious.
Taurophobia- Fear of bulls.
Technophobia- Fear of technology.
Teleophobia- 1) Fear of definite plans. 2) Religious ceremony.
Telephonophobia- Fear of telephones.
Teratophobia- Fear of bearing a deformed child or fear of monsters or deformed people.
Testophobia- Fear of taking tests.
Tetanophobia- Fear of lockjaw, tetanus.
Teutophobia- Fear of German or German things.
Textophobia- Fear of certain fabrics.
Thaasophobia- Fear of sitting.
Thalassophobia- Fear of the sea.
Thanatophobia or Thantophobia- Fear of death or dying.
Theatrophobia- Fear of theatres.
Theologicophobia- Fear of theology.
Theophobia- Fear of gods or religion.
Thermophobia- Fear of heat.
Tocophobia- Fear of pregnancy or childbirth.
Tomophobia- Fear of surgical operations.
Tonitrophobia- Fear of thunder.
Topophobia- Fear of certain places or situations, such as stage fright.
Toxiphobia or Toxophobia or Toxicophobia- Fear of poison or of being accidently poisoned.
Traumatophobia- Fear of injury.
Tremophobia- Fear of trembling.
Trichinophobia- Fear of trichinosis.
Trichopathophobia or Trichophobia- Fear of hair. (Chaetophobia, Hypertrichophobia)
Triskaidekaphobia- Fear of the number 13.
Tropophobia- Fear of moving or making changes.
Trypanophobia- Fear of injections.
Tuberculophobia- Fear of tuberculosis.
Tyrannophobia- Fear of tyrants.

Uranophobia or Ouranophobia- Fear of heaven.
Urophobia- Fear of urine or urinating.

Vaccinophobia- Fear of vaccination.
Venustraphobia- Fear of beautiful women.
Verbophobia- Fear of words.
Verminophobia- Fear of germs.
Vestiphobia- Fear of clothing.
Virginitiphobia- Fear of rape.
Vitricophobia- Fear of step-father.

Walloonphobia- Fear of the Walloons.
Wiccaphobia: Fear of witches and witchcraft.

Xanthophobia- Fear of the color yellow or the word yellow.
Xenoglossophobia- Fear of foreign languages.
Xenophobia- Fear of strangers or foreigners.
Xerophobia- Fear of dryness.
Xylophobia- 1) Fear of wooden objects. 2) Forests.
Xyrophobia-Fear of razors.

Zelophobia- Fear of jealousy.
Zeusophobia- Fear of God or gods.
Zemmiphobia- Fear of the great mole rat.
Zoophobia- Fear of animals.


---