Answer:
You see a boat filled with people. It has not sunk but when you look again you don't see a single person on the boat. Why?
Used left or right I get to travel over cobblestone or gravel. Used up I vie for sweet success used down I cause men great duress.
Tear me off and scratch my head, what once was red is black instead. What am I?
I am a box who holds keys but not locks. With the right combination I may unlock your soul
I have a little pool with two layers of wall around it. One white and soft and the other dark and hard. What am I?
I flow from the Homerβs mouth when he sees doughnuts.