There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?

When it is alive we sing, when it is dead we clap our hands. What is it?

By using all numbers, i.e. 123456789 and subtraction/addition, operators number 100 can be formed in many ways.
Example: 98 + 7 + 6 - 5 - 4 - 3 + 2 - 1 = 100

But if we add a condition use of the number 32 is a must. Then there are limited solutions.
One of such solution is: 9 - 8 + 76 + 54 - 32 + 1 = 100

Can you tell me any other solution?

Move three sticks of the spiral below to form a square.

What does this simple rebus mean?

What number do you get when you multiply all of the numbers on a telephone's number pad?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

Why is the longest human nose just 11 inches?