TED2009: Nina Jablonski
Anthropologist Nina Jablonski is on stage at TED2009. She is talking about the consequences of darkly-pigmented people moving from high UV areas to low UV areas. If people move to areas where they didn't evolve skin to handle the types and quantity of UV, it can lead to trouble. Light pigmentation in tropics causes cancer and darkly pigmented people will get vitamin D deficiency, which leads to loss of immune function, mood, mental health, and a host of other disorders.
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