I mean theories with not much evidence presented, I guess. Such as, the way Homo sapiens was supposed to have pushed the Neanderthals to extinction in Europe, despite the fact the Neanderthals were better cold adapted, sturdier, had bigger brains and it seems perfectly decent tools. She didn't seem to put forward much evidence to suggest why it had happened. (We were just having a chat about it here at work. I don't know if anyone can enlighten me?)