How can a man go eight days without sleep?

What is red and smells like blue paint?

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?

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

What has a bottom at the top?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?