The Guardian today has a piece on the discovery of an ancient fire in South Africa around 1 m years ago. Interesting, but a big change occurred in human evolution around 2 million year ago, leading to genetic changes in digestion and brain size. Richard Wrangham has a plausible theory on this: cooked food allowed these changes by dramatically shortening the time needed for eat and acquire high energy nutrition. So Wrangham's hypothesis requires that our ancestors were eating cooked food twice as long ago as this find. The jury is still out.
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