Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

Which is heavier: a ton of bricks or a ton of feathers?

What does a man do only once in his lifetime, but women do once a year after they are 29?

Can you make the below equation true by using any three numbers from "1, 3, 5, 7, 9, 11, 13 and 15"?

( ) + ( ) + ( ) = 30

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

What is the difference between a jeweller and a jailer?

What's a single-digit number with no value?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?