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We started using tools during the Paleolithic period, which only goes back about two million years, but we and other great apes have been evolving since the Miocene era, which goes back as far as 20 million years
The participant agreed to have the case and images published
This format is suited for extended research programs requiring supply for multi-condition experimental designs
It distinguishes carefully between well-supported observations and areas where the evidence is thin or absent
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