This Tiny Knee Bone Had Nearly Vanished As Humans Evolved. It’s Coming Back

By Yasemin Saplakoglu A tiny bone hidden in the tendon of the knee started to disappear over the course of human evolution … or so scientists thought. Now, a new study finds that this so-called fabella (Latin for “little bean”) is making a comeback. The bone, which is a sesamoid bone, or one that’s embedded …