Everyone has it but no one can lose it, what is it?

Who has 13 hearts but no organs?

What is the only question you can't answer yes too?

What is black when it's clean and white when it's dirty?

What has legs but doesn't walk?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

What's not alive but can die?

What has a neck but no head?

What has an eye but can not see?

What has a bottom at the top?

What has many keys but can't open a single lock?

What's the only room from which no one can enter or leave?

What can run but never walks has a mouth but never talks has a head but never weeps has a bed but never sleeps.