Do You Know?
1. I have seen "night vision goggles" in movies. How do they actually work?
2. Can stars become planets ever and go around other stars?
3. How fast can a human being run? Is there a limit and why?
4. We keep reading about life forms deep in the ocean. How can we track them? 
5. Termites seem to work collectively. How do they manage to divide up the work?