Good Riddles

Question: Why is 12 divided in half 7?

Question: A father and his son are in a car accident and the father dies on the scene, so the father is out of the picture. The son is brought to the hospital and when he arrives, the surgeon said, "I can`t operate on my own son!" Who is the surgeon?

Question: What is older than Obama, sits still as stone, but in some people's eyes is more appreciated than the president's home ? Hint: HIS nickname has Two words and starts with H and the second with A.

Question: The more it dries, the wetter it becomes.

What is it?

Question: When you fall in me your as happy as could be, but you fall into depression when you lose me.

What am I?