Just because you know something to be true does not tell you **why** it is true.
People knew left handed people existed. They thought it was the devil’s work.
You know the sun will rise without having to know why.
Same with the cooking. If all the old people in your tribe eat their meat cooked, maybe the secret to living longer is cooked meat. You don’t have to know why.
Also meat cooking was as much about parasites and nutritional availability as it was bacteria.
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