February 13th is Galentines Day, so 13 things science says about friendship

On Galentine’s Day, it’s Uteruses before Duderuses. Ovaries before brovaries.

The “Galentines” concept was invented by the US sitcom, Parks and Recreation, in 2010.

Amy Poehler’s character Leslie Knope explains Galentines: “Oh, it’s only the best day of the year. Every February 13th, my lady friends and I leave our husbands and our boyfriends at home, and we just come and kick it, breakfast-style. Ladies celebrating ladies.”

In honor of this day, here are some 13 surprising facts Science has dug up about friendship:

Scientists say of the people you regard you as friends, only 50% regard you as a friend.

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Gaining a new romantic partner usually means losing 2 friends.

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Social isolation is as risky to your health as smoking 15 cigarettes a day or obesity.

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We lose (and replace) half of our friends every 7 years.

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For women, the most important factor for happiness is friendship, more than family bonds.

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Close friends tend to have similar DNA, up to 1%!  That’s like fourth cousins.

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Having a friend living within a mile (about 1.6 km) of you may increase your happiness by 25%

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Children recognize friendship by the age of 1.

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People tend to have fewer friends than their friends have.

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Having a good social life is as good for your health as quitting smoking.

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Frenemies make you more anxious than actual enemies

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If your close friend beocomes obese, your chances of becoming obese increase by over 100%

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Individuals are more attractive in groups of friends

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Just for fun: Even animals from different species can be friends, like this tortoise and hippo