The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Why Wine Glass Stem is so long?

Which country gets ill every time?

What is harder to catch the faster you run?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

What can you hold in your right hand, but never in your left hand?

What is red and smells like blue paint?

Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?

5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____