It's no coincidence that our bodies feel a little creakier as we age. The trillions of cells that make up our skeleton age too, and some change in ways that weaken the very structure of our bones.

Bone tissue is a complex structure, consisting of mineralized collagen fibers and a variety of non-collagenous proteins, including proteoglycans such as biglycan and decorin. These proteoglycans ...

Image: A Dual Energy X-ray Absorptiometry (DEXA) scan of a human hip bone, left, and a human spine, right. Credit: NASA Are bigger bones stronger bones? Not necessarily, according to a recent NASA ...