(CNN) — Many people view aging as an inevitable breakdown. Muscle loss, in particular, can carry a sense of dread: the fear that our bodies will become less capable with each passing year. The good ...

The trillions of microbes living in the human gut are increasingly recognised as important partners in human health.

During hibernation, brown bears spend up to six months lying almost completely still, without eating, drinking or exercising. When spring arrives, they leave their dens with their muscles largely ...