Who is she?

Question: A horse jumps over a castle killing a woman, who is she?

Question: When you're given one, you'll have either two or none?

Question: During what month do people sleep the least?

Question: When is 99 more than 100?

Question: You have a glass of water that looks about half full. How can you tell, only using the glass of water itself, if the glass is half full or not?

The glass is a right cylinder.

Question: The more you add, the less it weighs.