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This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?

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All humans evolved to find certain female traits attractive, across cultures, because they signal a potential mate's reproductive potential.

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Right?

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Actually, a new study finds that cultural norms can also play a big part.

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At least when it comes to big feet.

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Once women give birth, their feet tend to grow larger.

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Which means small feet are markers for youth and fertility, and thus should be universally attractive.

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A previous study did find a widespread small-foot preference.

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But University of Washington anthropologist Geoff Kushnick tested the hypothesis again among rural Indonesians called the Karo Batak.

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One-hundred-fifty-nine men and women looked at a series of female figures, identical except for subtly different foot sizes.

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Surprisingly, the Karo Batak rated the image with the largest feet the most attractive.

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The work is in the journal Human Nature.

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Among the Karo Batak, and other rural societies with low exposure to media, large feet are signs of a woman's strength and ability to do agricultural work.

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This cultural big foot bias contradicts the notion of universal ideals of beauty.

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Attractiveness is not one size fits all.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.

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