History is shaped by catastrophe

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History is shaped by catastrophe

These two videos are fascinating.

 

The Mystery Of The Village That Beat The Black Death | Riddle Of The Plague Survivors | Chronicle (48 min)

CCR5 Δ32 mutation is a common deletion of 32 nucleotides resulting in a frameshift and non-functional receptor. Its prevalence in European population ranges between 4 and 16% (frequency of homozygotes is 1%). It stops white blood cells getting infected.