Go on. Look inside.

Some tick bites can leave something behind: an immune reaction to alpha-gal, a sugar found in beef, pork and lamb.

A coin battery has no sharp edges, but if it gets stuck in the esophagus, wet tissue completes its circuit.

Pull a seatbelt slowly and it glides out, but yank it and it locks right away.

Every red blood cell lives for about four months.

Licking frozen metal can leave your tongue stuck to it.

When a splinter lets bacteria into your skin, a white blood cell called a neutrophil follows a chemical alarm and squeezes out of your blood vessel to swallow them.

A mosquito's 'bite' is really six tiny needles working together.

Your stomach is full of acid strong enough to help break down meat, so why doesn't it digest itself?

This man kept getting drunk without drinking any alcohol.