Q: Where does a bounced email return to?
What is the answer?

A: sender

Q: Which 31 minute documentary made in 1938, which asked for better housing, farm techniques and flood control and more electrical power, showed a great flood in the Mississippi River?
What is the answer?

A: river

Q: What is the name for an Australian Aboriginal spear-throwing device used to increase the power of a throw?
What is the answer?

A: woomera

Q: The absent-minded Professor Calculus was a colleague of which fictional character?
What is the answer?

A:
tin tin