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The Secret Lives of Ancient Humans — 10 modules, 3.5+ hours of exclusive content.

Cold-blooded animals like reptiles and fish have thrived on Earth for hundreds of millions of years using a fraction of the energy warm-blooded creatures require — so why did ancient humans and our mammalian ancestors evolve the extraordinarily expensive biological system of warm-bloodedness in the first place? Maintaining a constant internal body temperature burns an enormous amount of calories and requires a relentless food supply, yet evolution clearly decided this costly biological investment was worth every calorie. From the remarkable cognitive advantages of a constantly warm brain and the ability to remain active in cold environments, to superior immune function and dramatically faster reaction times, warm-bloodedness gave ancient humans a decisive and extraordinary survival edge. In this video, we explore the fascinating science behind why ancient humans evolved warm blood when cold blood clearly works too.

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📚 The Secret Lives of Ancient Humans — Full Course
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