Persistence Hunting
We all know how smart humans are.[1] Perhaps too smart for our own good. Our brains[2] got the right nutrition, stimulus, and circumstances to vastly distance ourselves from previous versions of "human."
As apex predators, over time, we used our brains to figure out many interesting ways of getting food in the most rapid way.
Just Run
But, before all that, our bodies were fashioned into the ultimate killer. Back in those days, we didn't need to be smart. We had already figured it all out. Just run. Sure, our spears were made of hardened wood and couldn't pierce a mastodon's hide, but that didn't matter. Because we discovered something about ourselves.
Through exactingly perfect conditions, our legs grew longer, our heart became specialized, our hair suddenly disappeared, our hips narrowed, our lungs grew bigger, and we perfected one of the best ways of cooling our bodies. We became a predator that literally RAN PREY TO DEATH.
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Sharks mindlessly bite. Cats see in the dark and are fast. Spiders defy gravity and are quick. Killer Whales (interestingly, mediawiki software thinks Orca and Orcas are misspelled.) work in packs to quickly take down their prey. All apex predators, with some exceptions, seem to work with a calculated slow wait before quickly striking.
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And geeze, we sure did it enough so that over time, all that good protein gave us bigger brains. Then we invented the bow and arrow.
buncha stuff
https://scholar.harvard.edu/sites/scholar.harvard.edu/files/dlieberman/files/2004e.pdf
https://dash.harvard.edu/handle/1/3743587
https://www.journals.uchicago.edu/doi/10.1086/708810
https://ui.adsabs.harvard.edu/abs/2019QSRv..217..310S/abstract
https://www.researchgate.net/publication/323210111_NEANDERTHAL_LIMB_PROPORTIONS_AND_COLD_ADAPTATION