Medium logic riddles for teens

You saw me where I never was and where I could not be. And yet within that very place, my face you often see.

What building has the most stories?

A man is found hanging in a room 30 feet off the ground. There is nothing else in the room except for a large puddle of water on the ground. The police can't see any way the man could have climbed the walls to get to where he is hanging. How did this man hang himself?

When is your uncle's sister not your aunt?

Wash it and it isn't clean. Don't wash it and then it's clean. What I Am?

When does Halloween come before Valentine's day?

A boy fell off a 30 meter ladder but did not get hurt. Why not?

A boy was rushed to the hospital emergency room. The ER doctor saw the boy and said, "I cannot operate on this boy. He is my son." But the doctor was not the boy's father. How could that be?

You are in a cabin and it is pitch black. You have one match on you. Which do you light first, the newspaper, the lamp, the candle, or the fire?

Four children and their pet dog were walking under a small umbrella. But none of them became wet. How?