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Small-Scale Question Sunday for January 22, 2023

Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?

This is your opportunity to ask questions. No question too simple or too silly.

Culture war topics are accepted, and proposals for a better intro post are appreciated.

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To my knowledge, it doesn't require a cold winter to reach either of these countries from Africa

All of these countries had quite dark-skinned populations several thousand of years ago. Then, populations originating from territory of modern China came and largely displaced them, sometimes without a trace of preceeding population. A large fraction of area of modern China was permafrost or under glaciers at some point.

Why do you think Indonesians literally living at equator have such light skin?

A diet based almost entirely on rice would tend to lighten the skin over generations, but the Chinese replacement also makes sense.

In general, it almost never occurs that some recent non-African population had its ancestors follow shortest path from Africa.