What is always in front of you but can’t be seen?

Before Mount Everest was discovered, what was the highest mountain in the world?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

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?

There are forty elephants and they have forty-fore heads. How can this be possible?

What has a ring but no finger?

There was a strange boy who was born before his father. How can this be possible?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?