Over the course of the Hitler regime in Germany, an estimated 6 million people were killed in concentration camps. And the dreadful fate of some of those bodies might surprise you: thousands of them were distributed to scientists for various research projects, some of which still play a key role in modern medicine. In a stunning report at Slate, Emily Bazelon explores the disturbing history of Nazi-era anatomy research, and unravels the stories of those who conducted it as well as those whose bodies were shuttled to 31 different laboratories throughout Germany.