Answer:
Nuclear fusion because the energy get other and make a from of ball energy and they blow up. I think.
Most important things done first
Answer:
A thousand years spoked wheels allowed heavy carts to evolve into light carts, or chariots. These may have been developed first to help the people herd their horses, or for hunting; they were soon being used for war, and were to have a far-reaching impact on the civilizations of the Middle East and China.
C. deflation
I don't want to write 20 characters like I have to to answer your question.