Episode 5 of 5 of our miniseries from author Henry Gee, based on his new book A (Very) Short History of Life on Earth. Buy A (Very) Short History of Life on Earth: Amazon Apple Books Bookshop.org Macmillan Check out all the Quick and Dirty Tips shows. Subscribe to the newsletter for regular updates.  Join the conversation on Facebook and Twitter. Links:  https://www.quickanddirtytips.com/ https://www.quickanddirtytips.com/podcasts https://www.quickanddirtytips.com/subscribe https://www.facebook.com/askscienceqdt https://twitter.com/askscienceqdt