Good Riddles

Question: Why did the chicken cross the road?

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

Question: There are two sisters: one gives birth to the other and she, in turn, gives birth to the first. Who are the two sisters?

Question: Before man discovered Mt. Everest, what was the tallest mountain in the world?

Question: A town only has one barber (he is male). The barber only shaves all of the people who do not shave themselves.

So who shaves the barber?