BIOLOGY

Koalas Have Fingerprints That Are Nearly Indistinguishable From Ours

Though humans and koalas don't have much in common, there is one big similarity: fingerprints. Koalas have looping fingerprints just like humans, and some might not be able to tell them apart.

mihailomilovanovic/iStock via Getty Images

The Surprising Reason Your Muscles Get Tired When You Exercise

Though it may be annoying, sudden muscle fatigue during exercise is nothing to worry about. It's a byproduct of the way your body uses energy.

David Clark, Wikimedia Commons // CC BY-SA 2.0

Don’t Smell the Flowers: How Alnwick Castle’s Poison Garden Finds Beauty in the World’s Deadliest Plants

Smelling or touching the plants in the Poison Garden at the UK's Alnwick Castle could send you to the hospital.

Why Do Flamingos Stand on One Leg?

Pink flamingos’ ability to stand on one leg seems impressive—but it might be less of a balancing act than you think.

Scientists Are Unlocking the Mysteries of an Echidna’s Fancy, Four-Headed Penis

An echidna’s penis doesn’t have to excrete any urine, which may help explain why it’s fancier than a human’s.

The chocolate frog on a very green leaf.

Scientists Have Identified a New ‘Chocolate Frog’ Species

We simply have to assume that at least one researcher made some reference to Harry Potter’s chocolate frogs when they found it.

Why Does the Sun Make Hair Lighter?

If you get natural blond highlights in the summer, your hair may be damaged by too much exposure to the sun.

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