<span>Wrong:
Everyone is welcome! We need some strong people to help with the set up come early.
Correct:
</span>Everyone is welcome! We need some strong people to help with the setup. Come early.
I believe the answer would be ignorance. Many of the cultures were actually very aware of their surroundings, and the world they lived in. Mostly through this interest, ancient cultures were currently finding out new ideas about their world.
