Answer:
What is yours but only used by others?
Dora died at a very old age on her 24th birthday. How can this be?
How can you place a pencil on the floor so that no one can jump over it?
A man is able to contact his long lost brother who has never met. They agree to meet. When the brother arrives he is able to instantly pick him out from the crowd. How is that possible?
What starts with an E, ends with an E & only contains one letter but is not the letter E
Not born, but from a Mother's body drawn. I hang until half of me is gone. I sleep in a cave until I grow old. Then valued for my hardened gold.