The hardest thing to over come for me would be boredom.

Because over time the start to crumble or melt.And after a while they are destroyed.

Because he shows them that it doesn't matter how old you are ,you can do any thing.

because it follows its orbit and its orbit is an oval so at certain points it is farther away.

i would take the 20 because it is more gainful.

jumping off a skyscraper (without a parachute) into a pool of sharks,but at last second turn on the jet pack.