This comprehensive video guide covers topics including the five historical mass extinction events, the sixth mass extinction, and de-extinction from Season 2, Episode 5 of the Netflix Series Bill Nye Saves the World, titled "Why All Our Friends Are Dying".CONTENTSDetailed Teacher's GuideTimestamps for each segmentDetailed notes on entire episode with additional helpful notesLinks to YouTube videos on related subjects from popular and respected educational channels and other online and print reso