It’s not just the big-name celebrities of the skeleton—the hips and knees and shoulders—that scream at us as we accumulate ...

By moving their head and shoulders or flexing their calves, athletes can turn the luge. Skeleton riders lack these controls and must flex the sled itself using their shoulders and knees to initiate a ...

So where do those extra bones go? For a baby to be born, the whole skeleton has to be squashy, so many of the bones are joined with flexible cartilage. And after birth, those bones start fusing ...