After you hit 50, sarcopenia — the natural loss of lean muscle — starts to speed up. Why does this happen? Your levels of "muscle-supporting hormones" — including estrogen and testosterone — decrease, ...

You may not be able to grow bigger muscles out of thin air, but you can 3D print them in microgravity, scientists at ETH Zurich have now established. "3D printing" refers to a type of manufacturing ...