Riddles Thursday!

Here are a 5 easy riddles. Leave me a comment with your answers, and i'll post a post later on in the week with the real answers. And try not to google any of the please. And Lizzy, don't answer ANY of these!

1. What travels around the world, but stays in one corner?

2. Why did the scientist put a knocker at his front door?

3. What falls without making any noise?

4. What's the last thing you take off before you go to bed?

5. What can you hold without touching?

I hope you enjoy solving these!

Katie