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?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Can you make the number 24 by utilizing the numbers 1, 3, 4 and 6? You must use one number only one time and you can use mathematical operation symbols anytime anywhere.

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

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

Why are all black people so quick ?

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?

What occurs twice in a week, once in a year but never in a day?

When it's bad luck to meet a black cat?