There was once an extinction that wiped out so much life on Earth, it was practically a reset button. So what if that button was never, pushed? Life goes down a far different path. Follow Me On Twitter: https://twitter.com/AltHistoryHub I Wrote A Book: https://amzn.to/2VQ21kh Special thanks to my paleontologist friend Matt for helping out, as well as shoutout to TreytheExplainer for inspiring this video.