Why European Diseases Devastated the Americas
CGP Grey · Explainer · YouTube title: Why Some Diseases Only Traveled One Direction
Why it's here
HN commenters point to it as a clear, short explanation of one-directional disease spread and the core argument of Guns, Germs, and Steel.
What it covers
CGP Grey explains why European diseases devastated the Americas while few deadly diseases traveled the other way. He ties it to livestock domestication, dense cities, and the ideas of Guns, Germs and Steel.