Kids Riddles

Question: A man drops an egg onto the cement. The egg doesn't break after falling 3 feet.

How could this be?

Question: I give advice to others,
yet I know nothing myself.
I am a hitchhiker destined to stay still.

Question: Filled with garb,
the price is free.
Just return what you don't need.

What am I?

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

Question: Drop me and the world will shatter,
and you can always find me where you empty your bladder.

What am I?