How can a man go eight days without sleep?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting 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 21x = 79x, what is the value of x?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

Who can jump higher than a Mountain?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Keyboard words are not in alphabetical order, Why?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?