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?

You walk into a room and see a bed. On the bed, there are two dogs, five cats, a giraffe, six cows, and a goose. There are also three doves flying above the bed. How many legs are on the floor?

What question can you never answer yes to?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

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

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

If 1+9+8=1, what is 2+8+9?