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Curated by: MathYeux Sommet (340 videos)
In which John gets curious about the last time global human population declined and ends up learning about a period of human history called The General Crisis. Thanks to Our World in Data for being such an amazing source of information about life on Earth: https://ourworldindata.org/ And thanks to Hannah Ritchie for answering my question! Learn more about the general crisis: https://en.wikipedia.org/wiki/The_General_Crisis ---- Subscribe to our newsletter! http://nerdfighteria.com/newsletter/ And join the community at http://nerdfighteria.com http://effyeahnerdfighters.com Help transcribe videos - http://nerdfighteria.info John's twitter - http://twitter.com/johngreen John's tumblr - http://fishingboatproceeds.tumblr.com Hank's twitter - http://twitter.com/hankgreen Hank's tumblr - http://edwardspoonhands.tumblr.com