Some of our bones are easy to see. The zygomatic bones that give our cheeks shape, the delicate phalanges of our fingers, and the bony bulbs that are our kneecaps all stand out from beneath the flesh.

The investigation into disgraced financier Jeffrey Epstein's death could hinge on a minute bone in his neck that in the past has shed light on whether a cause of death is a suicide or a murder.