Good Riddles

Question: Something all men have,
but all men deny.
Man created it,
but no man can hold it.

What is it?

Question:

What is the most common use of cowhides?

Question: Would you rather enter a pool with a man eating shark, or a pool with ten electric eels?

Question: What sport starts with a T, has four letters, and is played around the world?

Question: How many people do you need to have the odds be in favor (at least 50% chance) of two people having the same birthday?