Nature selects the fittest to survive. Human beings are deeply obsessed with their own high intelligence. The reason for human beings' past misfortunes is actually human beings' too hasty jump in ecological status, which makes us too easy to think that we are the limit of creation.
But in fact, many things are not achieved overnight. In the face of sudden differentiation, the power of medicine has not been able to keep up. Facing a world without inhibitors and peeling surgeries, people are roughly separated by geographical isolation.
Ps: I don't have any medical experience. The things in the article are just written indiscriminately, just take a look.
Atypical ABO articles
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