Good Riddles

Question: Two men find an old gold coin and want to have a coin toss with it to decide who gets it. The only problem is the coin is heavier on one side so it comes up heads more than tails. What is a fair way for the men to toss the coin and decide who gets the coin?

Question: If a farmer has 5 chickens, two horses, and a wife.

How many feet are on his farm?

Question: You find me behind the stars; or in a sixth, seventh, or third.
It takes something round, a computer, and me to make pie.
I am bigger than anything you can think of.

What am I?

Question: What has thousands of ears but can't hear a thing?

Question: What goes up when the rain goes down?