What does this mathematical rebus means ?

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

What is so fragile that saying its name breaks it?

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

What number do you get when you multiply all of the numbers on a telephone's number pad?

How can a man go eight days without sleep?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

What has a ring but no finger?

Can you tell a 3D object that has just two surfaces?

What four weights can be used to balance from 1 to 30 pounds?