Ultimately, Mars will test our biology more than our technology. Every gram of muscle preserved, every synapse protected, every cell repaired will be a triumph of physiology. Space may dismantle the ...

Behold, the human brain: Often compared to a computer, the body's most complex organ operates using a code of electrical and chemical signals. These signals transmit through wires, nodes and networks ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Each human is a ...

It happens to all of us, and usually far sooner than we expect: You suddenly find that every time you get in or out of a chair, there's a veritable chorus of sounds from both your joints and your own ...

Fatigue more quickly, minor temporary aches and pains, balance that seems less secure... what if these everyday details were actually the discreet messengers of your biological age? A study published ...