In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

What jumps when it walks and sits when it stands?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

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

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?