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The authors are professors at the University of French Polynesia, so I guess they have some personal experience of these matters.
What about continuously cold environments like the inuits and northern siberians? Some possible counter-examples to the study: 1. Native Tasmanians 2. Native Argentines 3. Inca civilization
Yeah there are some outliers. 1 likely recently descended from more tropical people.
And the reverse of that: Singapore.
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