Tricky riddles with simple answers

It's 7:00 am. You are asleep and there is a sudden knock on the door. Behind the door are your parents, who came to have breakfast. In your fridge: bread, pasteurised milk, juice, and a jar of jam. What will you open first?

What is the center of Gravity?

A black dog stands in the middle of an intersection in a town painted black. None of the street lights are working due to a power failure caused by a storm. A car with two broken headlights drives towards the dog but turns in time to avoid hitting him. How could the driver have seen the dog in time?

David's father has three sons : Snap, Crackle and _____ ?

What is it that when you take away the whole, you still have some left over?

What starts with a 't' ends with a 't' and is full of 't' ?

I'm in you, But not in him, I go up, But not down, I'm in the colosseum, But not a tower, I'm in a puzzle, But not a riddle.

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

How can a man go eight days without sleep?

Scientists are trying to find out what is between earth and heaven. Can you find me?