Learn the science behind the sensation of butterflies in the stomach and what it reveals about your body.

BIOLOGY
There are a lot of myths and misunderstandings about menstruation. But it’s important to parse out what’s true and what’s a lie.
Was it a rat? Probably not.
Don’t be surprised to see wild wallabies hopping around the UK.
A fishing group thought they caught a giant goldfish. What they hooked was actually much weirder.
The ♂and ♀ symbols initially had nothing to do with representing human sex or gender.
Charles Davenport’s Eugenics Record Office collected data on thousands of Americans, hoping to support a pseudoscientific theory that would create a more perfect human race. It led to unspeakable tragedy.
The newly identified Atlantic manta ray is officially a distinct species.
There's a big wide world beyond common molds and mushrooms—and some of it is very strange.
Scientists have made the first comprehensive marine wildlife size database to help scientists better understand ocean ecosystems.
Scientists captured the elusive Antarctic gonate squid on camera for the first time during a National Geographic expedition.
From the long legs of the jerboa to basically everything about the duck-billed platypus, evolution has taken some weird turns.
The Carnarvon flapjack octopus flattens its body like a pancake and uses its Dumbo-like fins to swim.
A rare grasshopper once believed to be extinct has been spotted for the first time since 1980—but habitat loss may threaten its future.
There’s a right and a wrong way to wipe your butt after all. But with these expert-approved tips, you’ll be sitting pretty in more ways than one.
Getting bitten by it won’t give you superpowers, as far as we know.
Skates lay black, ravioli-shaped egg cases. Rays give birth to live pups.
Scientists in Mexico have found that axolotls bred in captivity can survive and thrive in their native habitat—which is great news for the species.
Researchers in Indonesia have filmed a rare coelacanth nearly 500 feet underwater—marking the first time the fish has been recorded in its native environment.