Answer:
What turns from red to black as soon as it touches water?
What moves without seeing and cries without eyes?
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.
Which button does not function when being pressed?
It is greater than God and more evil than the devil. The poor have it, the rich need it, and if you eat it you'll die.
You use it between your head and your toes, the more it works the thinner it grows.