My fiance' had a similar argument in High School. I was with my partnet in Cuba(Guantanamo Bay, he was in the Marines at the time). She got into an argument with her HISTORY teacher; he said there was no U.S. base in Cuba, she told him otherwise. "OK, if there's no base there, then where are my boyfriend and his Marine father staying?"...and "I have letters from him, would you like me to bring them in so you can see the postmark and the address?". Sometimes, teachers are more worried about appearing all-knowing than actually allowing their students to really LEARN.