What has lots of eyes, but can’t see?

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?

What building has the most stories?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Name a key which is hardest to turn.

What is the centre of gravity?

What can you see in the middle of March and April that you can never see in any other month?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

What number when divided in half becomes zero?