An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

What is black when you buy it, red when you use it, and gray when you throw it away?

John can fit six large chocolate boxes or nine small chocolate boxes into a carton. How many cartons will he require to put sixty-six chocolate boxes into?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

What does the below rebus riddle means?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

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

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?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?