## 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.

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## 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?
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## Sunday, October 28, 2007

### Amazing Roads of the World

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

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## 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?
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## 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?
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## 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?

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## 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?

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## 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?

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## 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?
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## 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 .
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-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}.
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## 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!!
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## 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.

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## 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.

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## Wednesday, October 3, 2007

### Solution to Burning Rope Timer Puzzle

Solution to the puzzle --Burning Rope Timer Puzzle.
For those who haven't read the puzzle, first give it a try at Burning Rope Timer Puzzle
Keep both the ropes alongside. As it is said the ropes are not uniform and both burn in exactly 1 hour. Keeping the rope alongside length, light one rope at both the ends and the second rope at one end. When the first rope is burnt completely that means half an hour has elapsed (because burnt from both sides, no matter how non-uniform it is, it will burn completely in half hour). When the first rope is finished , light the other end of the second rope. When the second rope is also finished, its 45 minutes time
When the first rope is finished, i.e. half hour has elapsed , the remaining part of rope has to burn in 30 minutes. Now again no matter how non-uniform the rope is ,when burnt from both ends it will take half the time when it is burnt at one end. So the remaining time for the second rope when burnt from both the ends will be 15 minutes. This makes total of 45 minutes
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## Tuesday, October 2, 2007

### Crazy guy on Aeroplane Puzzle

Crazy Guy on Aeroplane Puzzle
A line of 100 airline passengers is waiting to board a plane. they each hold a ticket to one of the 100 seats on that flight. (for convenience, let's say that the nth passenger in line has a ticket for the seat number n.)
unfortunately, the first person in line is crazy, and will ignore the seat number on their ticket, picking a random seat to occupy. all of the other passengers are quite normal, and will go to their proper seat unless it is already occupied. if it is occupied, they will then find a free seat to sit in, at random.

what is the probability that the last (100th) person to board the plane will sit in their proper seat (#100) ?
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## Monday, October 1, 2007

### Solution to Twins Birthday Puzzle

Solution to the puzzle - Twin Birthday Puzzle
For those who havent read the puzzle.. first try it at Twin Birthday Puzzle
First child born at 11:59pm on Feb 28th
at 12:00 am, it is now March 1st
At 12:01 am, the plane crosses the international date line
so now it is March 2nd
at 12:02 am, child is born
All this happens in a non-leap year
but the birthdays in question are being celebrated in a leap year
Importantly, amongst twins, the child born later is considered 'older'
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