- Why is it not warm even though the sun's out?
- How do vampires grow their teeth?
And my personal favorite:
- How does food get bad?
For most of the questions I try to explain in simplest terms, if I even know the answer, but for that last question I was stumped. How in the world do you explain the science of food spoiling to a four-year-old?
I'll update with more questions, if I can remember them. He's got an very inquisitive mind and I love it!