When you put time on a grand scale, it would appear that change is something that takes a very long time to happen. But take a quick snap of any given era, and you'll quickly see how that really isn't the case.
It turns out that many of the simple pearls of wisdom we take for granted as universal truths just don't stand up to the cold, hard scrutiny of scientists.
It turns out that archaeology has proven a whole bunch of our assumptions to be wrong, which, in addition to tricking Nazis into melting their own faces off, is exactly what archaeologists are supposed to do.