Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

You are playing as white and given four rooks to checkmate the black king in four moves with the following rules 1. You can place one rook every move and ensure the black king should be in check position.2. After four moves the black king should be in the checkmate position.

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

What has many teeth, but cannot bite?

Why is Saturday stronger than Monday?

What seven-letter word has hundreds of letters in it?

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

There is something which is always coming but never arrives?

Why is a river so rich ?

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