A brain-activated, bone-derived hormone called osteocalcin regulates the acute stress response in rodents and possibly humans.

Researchers say the skull belongs to an Australopithecus species once thought to be a predecessor to “Lucy,” but now that relationship is murky.

Animal studies and a few small clinical trials show it’s possible to get commensal microbes to protect against bone loss, rather than contribute to it.

Juvenile eels break down bone tissue and rebuild it in preparation for mating.

The fabella disappeared from our lineage millions of years ago, but over the last century, its presence in people’s knees has become more common.

They hope to develop the “exercise hormone” into therapeutics that harness the benefits of exercise for people unable to do so.

Researchers recovered the cells that give rise to bone and cartilage from fetal and adult bone marrow and also derived them from induced pluripotent stem cells.

Ultrasound-stimulated microbubbles enable gene delivery to fix fractures.

The new technique helped pig tibias heal in just eight weeks.