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Did Acheulean hominins have long-distance obsidian trade?

I review several papers looking into the occurrence of obsidian artifacts in the Acheulean of eastern Ethiopia.

J. Desmond Clark photographing artifacts on a desert landscape
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Are the "earliest modern human" skulls really modern?

The redating of the Omo Kibish fossil remains prompts a close look at what it means to be a modern human.

Replica of the Omo 2 cranium from left lateral view