Good Riddles

Question: What number when divided in half becomes zero?

Question: I see you, you see me; I raise my right, you raise your left. What am I?

Question: I have 6 faces and 21 eyes, but can't see a thing. What am I?

Question: It is always bought when you're hungry, but it doesn't get eaten. What am I?

Question: If 2=8, 3=27, 4=64, and 6=216, what does 9 equal?