Clean riddles

How can you drop a raw egg from a height onto a concrete floor without cracking it?

I am slim and tall, many find me desirable and appealing, they touch me and I give a false good feeling, once I shine in splendor, but only once and then no more, for many I am "to die for".

The more you take, the more you leave behind. What am I?

Why is a river rich?

You are in a room with 3 monkeys. One monkey has a banana, one has a stick, and one has nothing. Who is the smartest primate?

When you do know me about me, them I am definitely something. You will always search for me. But when you know me, I am nothing. Who am I?

You can see me in water, but I never get wet. What am I?

What runs around the house, but does not move?

One day a really rich old man with two sons died. In his will he said that he would give one of his sons all of his fortune. He gave each of his sons a horse and said they would compete in a horse race from Los Angeles to Sacramento, but the son whose horse came in second would get the money. So one day they started the race. After one whole day they had only ridden one mile. At night they decided they should stop at a hotel. While they were booking in they told their problem to the wise old clerk, who made a suggestion. The next day the two brothers rode as fast as they could. What did the clerk suggest that they do?

An iron horse with a flaxen tail. The faster the horse runs, the shorter his tail becomes. What is it?