I need a two really difficult questions about history with its respective answers.
Question 1: It should be a why question, and a question rarely asked in school because it's real hard to answer. Unless you're majoring in History or getting a Ph.D. And not many people know the answer to it.
Question 1: It should be a question that can initiate a strong and heated debate that really creates a battle of wits between two sides.

I also need two difficult why questions either about chemistry or biology, with answers. I don't care whatever, as long as they're hard to answer.

Thanks so much in advance!