Can you find the key in the picture below?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

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

Why Aeroplane windows are round?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

What part of Turkey has the most feathers?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...