About the time the last glacial maximum started.
They assume “training” made the brains and not that the brains provided the ability for the skills.
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agreed.
...i only agree with them, there was a “leap” in that time frame, after relative stagnation for 120,000 years.
so the event is clear, but the cause is debatable.
and i seem to recall that there was a near extinction event (for humans) around 74,000 years ago...