1. Newton thought about why things fall down and not up or sideways.
2.While he was getting out, he noticed that the water went down in the bath. So he got back in, and the water went up.
3.He shouted "Eureka!" because he was Greek, not English.
4.Because they needed people like Newton and Archimedes to do the thinking.
If you have more questions for your homework, you can ask me.
