Inquiry Hour Blog Post 1.2: Generating questions

One of the questions I am most interested in is, "What makes us human?" This is an interesting question because many animals have similar traits as humans, yet they do not not create and destroy things nearly as much as we do. A possible hypothesis to help answer this question is "If the mastery of fire makes us human, then teaching another animal to make fire will help it to advance to human levels of intellect."
Here is a list of twenty questions that I am interested in:

1. Why is the sky blue?
2. Why do we see colors?
3. Why do boomerangs come back?
4. Why don't spiders stick to their webs? 
5. Why are flamingos pink?
6. What happens when you faint?
7. Why do bruises change colors?
8. Why do people go bald?
9. Why do men grow facial hair?
10. Why do things fade in the sun?
11. Why does black heat up in the sun faster?
12. How do glasses work?
13. How do contacts work?
14. Why do things look darker when they are wet?
15. How does hair know when to stop growing?
16. Why does your stomach make noises?
17. Why do I have to use a number 2 pencil?
18. Why am I upside-down when I look in a spoon?
19. Do plants get cancer?
20. Why are we ticklish?