How can a man go eight days without sleep?

Solve the mathematical equation in the picture below.

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

What kind of storm is always in a rush?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?