We were once mermaids. Plus, a suddenly not ’rare’ disease; the real Harriet the Spy

Also, a death moon; how menstrual cycles affect the brain; your tongue and your real age; toilet paper and Mardi Gras

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Email from National Geographic. The seven love hormones; the science of touch; outdoor ’therapy’; ending a toxic relationship (with sugar)

The seven love hormones; the science of touch; outdoor ’therapy’; ending a toxic relationship (with sugar)

Email from National Geographic. Shop 18 innovative Valentine's Day gifts + Nat Geo staff picks

Shop 18 innovative Valentine's Day gifts + Nat Geo staff picks

Email from National Geographic. How old are you? Stick out your tongue.

How old are you? Stick out your tongue.

Email from National Geographic. Mocktails are on the rise, but are they helpful or harmful? Subscribe now to find out, just $19/year.

Mocktails are on the rise, but are they helpful or harmful? Subscribe now to find out, just $19/year.

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Inspire the joy of learning with Nat Geo Little Kids Magazine! Just $34/year (6 issues)

Email from National Geographic. Where Valentine’s Day is unloved and forbidden; Plus, what do we know about the Tollund Man?

Where Valentine’s Day is unloved and forbidden; Plus, what do we know about the Tollund Man?

Email from National Geographic. How science solved the mystery of the severed feet. Plus, 9 tips to feel better

How science solved the mystery of the severed feet. Plus, 9 tips to feel better

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