Top 5 signs your your ancestors were geniuses at beating the heat

We're dealing with the climate now. But it's not the first time...

Before air conditioning in the latter half of the 20th century, humankind didn't just suffer in the heat. We met the heat with creativity and a whole lot of cool.

Let me just say it: I love AC. I even own a T-shirt with an AC unit on it. I love my AC that much. Yes, AC feels good, but the fact is, it isn't all that great for the environment.

That's why I was so impressed to discover that the...

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top 5 signs your ancestors were genuises at beating the heat

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