What two letters in the alphabet say goodbye?

What instrument can you hear but never see?

I am black when clean and white when dirty. What am I?

What do you throw out when you want to use it, but take in when you don’t want to use it?

If your aunt’s brother is not your uncle, what relation is he to you?

What seven-letter word has hundreds of letters in it?

A boy throws a baseball. It travels 40 feet and then goes right back to the boy. How is that possible?

What gets whiter the dirtier it gets?

How many apples grow on a tree?

What can be broke without touching it?