Stomach acid is strong enough to dissolve some metals.

Wacky WorldHuman Body

Gastric acid has a pH of about 1.5–3.5. The stomach lining protects itself with mucus and constant cell renewal.

Another wacky fact → All facts

Explore more Wacky World facts

Your nose and ears keep growing slowly throughout life.You blink around 15–20 times a minute.The smallest bone in your body is in your ear.