Did our stone-age ancestors chase down antelope across the hot, dry savanna, armed with nothing but maybe some blunt sticks or rocks, for hours on end, never letting the animals rest until they ...

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Hairless, clawless, and largely weaponless, ancient humans used the unlikely combination of sweatiness and relentlessness to gain the upper hand over their faster, stronger, generally more dangerous ...

Think about taking a walk: where you need to go, how fast you need to move to get there, and whether you need to bring something along to carry the results of your errand. Are you going on this walk ...