This episode is set 75,000 years ago in India, following a catastrophic super-volcanic eruption which forced a showdown between our ancestors and a completely different species of human, Homo erectus, who up until that point had reigned supreme. Homo erectus was a successful, long-lived species that migrated out of Africa. Possibly the first humans to live in hunter-gatherer societies, they also used rafts to travel the oceans.
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