Related topics: neanderthals · modern humans

Solving an age-old mystery about crystal formation

A million years ago, the oldest known species to walk upright like a human, the Homo erectus, had a human-like fascination with crystals. Historians can even pin down the possible reasons—crystals didn't look like anything ...

Do technological civilizations depend on atmospheric oxygen?

Nearly 2 million years ago a species of upright apes known as Homo erectus began to use fire. It was a gradual process, from opportunistic users of natural fires to masters able to craft flames from flint and tender. We are ...

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