Why Wine Glass Stem is so long?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

Where do you go to learn how to make ice cream?

A bomb exploded in a room full of married couples and no one died. How?

Where do fish keep their money?

What do you get if you add 2 to 100 four times?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

Rearrange the letters in "new door" to make one word.

You bought me for dinner but never eat me. What am I?