2. You cross the river by walking across the ice.
3. You walk backwards, so that when the bridge man sees you, he'll think that you're came from the other side, going to the opposite side, and he'll force you to go back to the side where he thought you came from. And ta da, you successfully crossed the bridge.
4. Why not?
5. An ear of corn.
6. 1990 dollar bills are worth $1990, while 1989 dollars are worth only $1989.
7. "One Word"
So how well did you do? Are you a genius or an idiot. . .
Go back to the mind twisters.
Go back home.