If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?
Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?
What can you see in the middle of March and April that you can never see in any other month?
A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?
What do you answer even though it never asks you questions?
What has hands, but can’t clap?
How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.
How old is the man's son ?
How many times can you subtract the number 5 from 25?
First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?
Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?
Find the hidden tiger in the given optical illusion ?
In 2011, people playing Foldit, an online puzzle game about protein folding, resolved the structure of an enzyme that causes an Aids-like disease in monkeys. Researchers had been working on the problem for 13 years. The gamers solved it in three weeks.