Here's the original paper<p><a href="https://www.nature.com/articles/s41559-017-0138" rel="nofollow">https://www.nature.com/articles/s41559-017-0138</a><p>You really should read it if you have any interest at all in the evolution of life. Just a ton of facts integrated in a framework that seems very sound, at least from my non-expert perspective.