We all sat through history classes in school, and, mostly, we pretty much believed what our teachers taught us. But how often are accepted historical “facts” anything but true? How about a president’s wooden dentures, horns on Viking helmets, a cow that started the Great Chicago Fire? Truth is, they’re all historical facts that need a good trashing. Read on to discover 40 of the most pernicious “truths” from history that are actually entirely false.