Exercise helps beef up bones, but exactly how hasn’t been clear. A study published today (December 13) in Cell points to irisin, dubbed the “exercise hormone,” as a messenger between muscle and bone ...

The fossils — which may date back to 1.4 million years — were nicknamed “Pink” in honor of iconic rock band Pink Floyd.

Spiegelman’s group first identified irisin as a hormone released from human muscle during physical activity in 2012. It has been a source of scientific contention ever since. Three years ago, ...

The upper jawbone and partial cheek bone represent a mysterious unknown species that lived in present-day Spain between 1.1 ...