can you figure out the worlds hardest riddles???

1.Paul is 20 years old in 1980, but only 15 years old in 1985. How is this possible?

2.What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.

3.I have four wings, but cannot fly, I never laugh and never cry; On the same spot I'm always found, toiling away with little sound. What am I?

4.A man and a woman were driving in their car when it broke down. The man decided to go for help at a gas station a few miles back. He made sure nobody was in the car, rolled all the windows up, and locked all of the sedan's doors. He went off, but when he came back, his wife was dead, and there was a stranger in the car. No physical damage was done to the car, so how did the stranger get in?

5.What's black when you get it, Red when you use it, And white when you're all through with it

6.I can be long, or I can be short. I can be grown, and I can be bought. I can be painted, or left bare. I can be round, or square. What am I?

Additional Details
7.Sabrina gave Samantha as many dollars as Samantha started out with. Samantha then gave Sabrina back as much as Sabrina had left. Sabrina then gave Samantha as back as many dollars as Samantha had left, which left Sabrina broke and gave Samantha a total of $80.00. How much did Sabrina and Samantha have at the beginning of their exchange?

8.Two convicts are locked in a cell. There is an unbarred window high up in the cell. No matter if they stand on the bed or one on top of the other they can't reach the window to escape. They then decide to tunnel out. However, they give up with the tunneling because it will take too long. Finally one of the convicts figures out how to escape from the cell. What is his plan?

9.Name an eight letter word that has kst in the middle, in the beginning, and at the end.

10.Something very extraordinary happened on the 6th of May, 1978 at thirty-four minutes past twelve a.m. What was it?