January 5, 2019

Why do I have fingerprints?

Those whirls, swirls, loops, and arches on your fingertips (and toes, in case you didn’t know) are unique to you – even if you have an […]
January 5, 2019

Why do my fingers wrinkle when I’ve been swimming?

You might think that playing in the pool or soaking in the tub makes your fingertips and toes waterlogged and soggy. Not so! The prune effect […]
January 5, 2019

Why can I pop my knuckles?

When you move or bend your fingers, you occasionally squeeze tiny air bubbles that form in the protective fluid around your body’s joints. Those popping bubbles […]
January 5, 2019

Why do I have fingernails? (and toenails)

Humans evolved with flattened fingernails instead of the thicker, sharper claws found on most mammals. Researchers think that fingernails and toenails helped our ancestors climb trees, […]