Mindbreakers

A helium-filled balloon is tied to the floor of a car that makes a sharp right turn.
Does the balloon tilt while the turn is made? If so, which way?
Note that the windows are closed so there is no connection with the outside air.
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There was a guy who had a Fox, a Chicken, and a bag of Grain.
He had to cross a river to get back home, but he could only take one item with him at a time. He could only take the fox, or the grain, or the chicken.
Well, if you leave a chicken and a […]

Do you want to make some money?
OK, let’s say you have a dime.

If you square $0.10 it equals to this $ 0.01.
$(0.10)^2 = $ 0.01.
So you will get a penny

However if you square 10 cents you get 100 cents.
(10 cents)^2 = 100 cents.
So you just earned a full dollar out of a […]

You want to send a valuable object to a friend.
You have a box which is more than large enough to contain the object. You have several locks with keys. The box has a locking ring which is more than large enough to have a lock attached. But your friend does not have […]

�I heard you are a genius. Then the following problem won�t be a problem …�

Mr. Smith and his wife throw a party and invite four married couples.
There are some of them who know each other, and some who don’t. Those who do not know each other, shake hands.
Mr. Smiths asks all the participants of the […]

Why does a mirror appear to invert the left-right directions, but not up-down?

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An Arab sheikh tells his two sons to race their camels to a distant city to see who will inherit his fortune. The one whose camel is slower will win.
The brothers, after wandering aimlessly for days, ask a wise man for advise. After hearing the advice they jump on the camels and race […]

Hanging over a pulley there is a rope, with a weight at one end. At the other end hangs a monkey of equal weight.
What happens if the monkey starts to ascend the rope?
Assume that the mass of the rope and pulley are negligible, and the pulley is frictionless.
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A person in a boat drops a cannonball overboard; does the water level change?
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How can you place the numbers 1 to 9 in the cells, so you can add those numbers horizontally, vertically and diagonally and get 15 each time ?

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