Who was Mark Twain's brother?
Choo-Choo Train (Twain sounds like Train).
What is 5Q plus 5Q?
1.) 10Q but also... 2.) You're Welcome(10Q sounds like Thank You)
There's a line. You have to make it larger but may not touch it. How can you make the line longer without touching it?
Go over a little to the right of the line and make a new line. Therefore, the line was made bigger without touching it!
What's a physicist's favorite snack?