Humans: Hot, Sweaty, Natural-Born Runners
 http://www.physorg.com/news95954919.html

...adaptations allowed us to relentlessly pursue game in the hottest part of the day when most animals rest ...humans likely practiced persistence hunting, chasing a game animal during the heat of the day, making it run faster than it could maintain, tracking and flushing it if it tried to rest, and repeating the process until the animal literally overheated and collapsed.

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