I am currently still in high school, and recently finished reading Guns, Germs and Steel. It was a tough read but I really enjoyed it. However, I heard some recent debate that it was outdated. I took the book with a grain of salt, given that it was published in the late 1980’s (I think). It has been updated recently though. I have used it as a source in some history essays for school. My teacher didn’t seem to care... Any opinions or advice?