Anatomy

Radiation is all around us, but how does it get into our bodies?

Here's the highest temperature and humidity level that people can tolerate.

The respiratory system is responsible for taking in oxygen and expelling carbon dioxide. The main organs are the lungs, which work in concert with the cardiovascular system.

There isn't an official "organ count" for the human body, but is there a ballpark estimate?

Activated charcoal can protect against some poisons, but can it help whiten your smile?

Wouldn't it be easier if our teeth didn't feel pain?

Evidence suggests that modern humans may be cooler than our 19th-century ancestors.