What breaks yet never falls, and what falls yet never breaks?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

When it's bad luck to meet a black cat?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

Who is that with a neck and no head, two arms and no hands? What is it?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Why do we preferably have round manhole covers and not square ones?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?