Answer:
What has 13 hearts but no other organs?
Brown I am and much admired; many horses have I tried; tire a horse and worry a man; tell me this riddle if you can.
My snake-like body cracks and burns. I cause pain but pleasure too. What am I?
I am an object which is used in baseball during the day I can't be seen at all
The dirtier I get, the whiter I am. What am I?
What did the piece of wood say when he saw the screwdriver and screws approaching?