In 1918, New York City hired its first scientifically trained medical examiner, Charles Norris. Over the course of a decade and a half, Norris and his extraordinarily driven and talented chief toxicologist, Alexander Gettler, would turn forensic chemistry into a formidable science, sending many a murderer to the electric chair and setting the standards that the rest of the country would ultimately adopt.

Explore the 1928 collapse of the St. Francis Dam, the second deadliest disaster in California history. A colossal engineering and human failure, the dam was built by William Mulholland, a self-taught engineer who ensured the growth of Los Angeles by bringing the city water via aqueduct. The catastrophe killed more than 400 people and destroyed millions of dollars of property.