This video is a good example of why I love PBS Eons - There’s been a tendency with a lot of the other youtube science shows I’ve watched to cover things I already know about and only rarely surprise me. I often watched them for simpler ways to explain things I already knew, or to remember them for later when I might want to tell someone else about a topic and don’t have time to re-explain the basics. Eons consistently brings up stuff I just straight up did not know. Like what order turtle shell bits evolved in.