How Hunting Made Us Human

For decades anthropologists have debated when and how our ancestors became skilled hunters. Recent discoveries have yielded surprising new insights
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Some 279,000 years ago, on a ridge overlooking a vast lake in central Ethiopia's Rift Valley, hunters painstakingly shaped chunks of greenish black volcanic glass into small, sharp points. After chipping the brittle material to create cutting edges, they attached each point to a shaft of wood, producing a sort of javelin. It might sound like a modest feat of engineering by today's standards. But the technology was nothing less than revolutionary. With it, members of the human lineage had at their disposal a weapon that would allow them to kill much more effectively from afar than a simple wooden spear could. Not only would that development enable our predecessors to hunt a broader range of animals, but it also upped their odds of emerging from the hunt unscathed by putting a safe distance between them and large, dangerous prey, perhaps including the hippos that would have lurked in and around the nearby lake.

As far as technological inventions go, this stone-tipped throwing spear was arguably humanity's crowning achievement at the time. But perhaps more remarkable than the hunting gains it afforded is the fact that the conceptualization, manufacture and use of this seemingly simple device were made possible only through the piecemeal acquisition, over tens of thousands of generations, of traits that helped our forebears acquire meat.

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