The largest muscle in the human body is the Gluteus Maximus. It is responsible for keeping your posture upright, and is the principal antigravity force working when you walk up stairs.

So having a body covered in sweat glands became an advantage. DINGWALL: So you might be able to forage for longer, hunt for longer, collect more food. Or even if it's just - it could be as simple ...

For example, in the 1890s, anatomist Robert Wiedersheim published a list of 86 human "vestiges," or body parts that had "lost their original physiological significance" to humans.

The adrenal glands, found atop each kidney, weigh 5-10 grams in adults. The pineal gland in the midline of the brain is the size and shape of a grain of rice and weighs 50-150 mg.