Arthritis & Rheumatism

Why you shouldn't be afraid to start running after middle age

As someone who started marathon running in midlife, I know how many aches and pains (and doubts) you can have if you take on the challenge to start running at an older age. But as an orthopedic surgeon who has replaced thousands ...

Medical research

New research furthers case for exercise promoting youthfulness

A recent paper published in the Journal of Physiology deepened the case for the youthfulness-promoting effects of exercise on aging organisms, building on previous work done with lab mice nearing the end of their natural ...

Weightlessness

Weightlessness is a phenomenon experienced by people during free-fall. Although the term zero gravity is often used as a synonym, weightlessness in orbit is not the result of the force of gravity being eliminated or even significantly reduced (in fact, the force of the Earth's gravity at an altitude of 100 km is only 3% less than at the Earth’s surface). Weightlessness typically occurs when an object or person is falling freely, in orbit, in deep space (far from a planet, star, or other massive body), in an airplane following a particular parabolic flight path (e.g., the “Vomit Comet”), or in one of several other more unusual situations.

This text uses material from Wikipedia, licensed under CC BY-SA