I don't know if this kind of thing is normal or not, but I thought it was pretty interesting. My four year old daughter, out of the blue, says the following to me at the breakfast table one recent morning:
If you were the first person created, and you were on Mars where there was no air, you would just be bleah (Zoe sticks out her tongue and closes her eyes for effect on the word bleah) dead. No one else would be created. You'd just go straight to heaven.
And that was it. She didn't add anything to her comments or give me any other hints to clue me in to her many deep thoughts that lead her to the conclusion above.
All I could say was, "Yes, I think that if the first person was created on Mars, that's exactly what would happen."