It's a growing fitness trend. People say wearing a weighted vest when you exercise builds bones, strengthens muscles and improves cardiovascular health. But does research back up these claims?

New research shows lifelong bikers have healthier knees, less pain and a longer lifespan, compared to people who've never biked. This adds to the evidence that cycling promotes healthy aging.

Archaeologists have discovered evidence of a rare type of skull surgery dating back to the Bronze Age that's similar to a procedure still being used today.

An experiment involving some "mighty mice" on the International Space Station could someday help astronauts maintain muscle and bone strength on interplanetary journeys.