“When a Billion Years Disappeared [https://www.youtube.com/watch?v=6R_NAV8Ieuo]” “That Time It Rained for Two Million Years [https://www.youtube.com/watch?v=_1LdMWlNYS4]” “When Giant Scorpions Swarmed the Seas [https://www.youtube.com/watch?v=1sQXTXbuLYo]” One thing I like about the PBS Eons show