Humans lived in tiny, separate bands for 100,000 years

Humans lived in tiny, separate bands for 100,000 years: "Human beings for 100,000 years lived in tiny, separate groups, facing harsh conditions that brought them to the brink of extinction, before they reunited and populated the world, genetic researchers have said."
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Let's see...tiny, separate bands. Check. Facing harsh conditions. Check. So far it sounds like either a lot of HOAs or Chicago's sports teams.