Elizabeth Svoboda is the author of What Makes a Hero?: The Surprising Science of Selflessness, and she has contributed to Aeon, Discover, Psychology Today, and The New York Times. She lives in San Jose, California, with her husband and two young sons. Follow her on Twitter @svobodster.
After the Nazis' three so-called Operation Reinhard camps swallowed more than a million and a half Jewish lives, the camps were themselves destroyed. Forensic archaeologists are finally exploring what lies beneath the earth—but not without resistance.