In the early 20th century, tens of thousands of British soldiers returned home from World War I battles with a mysterious condition that left them racked with anxiety and in psychological distress. It was thought to be caused by the blast of artillery shells, so people called it “shell shock”. Now, a 100 years later, scientists at the Johns Hopkins University School of Medicine have found what they believe to be the physical evidence of “shell shock” in the brains of veterans. With Sheilah to talk about it is VassilisKoliatsos, professor of pathology, neurology, and psychiatry at the Hopkins School of Medicine.