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, […]
January 5, 2019

What are fingernails made out of it?

Believe it or not, that armor plating at the tips of your fingers is made of the same stuff as your hair and skin, a protein […]
January 5, 2019

Do animals have fingerprints like us?

It should come as no surprise that gorillas, chimpanzees, and other higher primates closely related to humans have fingerprints. But if you look closely at a […]