NOVA investigates what science can do in helping to solve murder—in understanding why it occurs, and how the rate might be reduced—and explores the work of people who have the stark job of dealing with death: the police, pathologist, scientists and psychiatrists.

For 150 million years, dinosaurs dominated the earth. Then, 65 million years ago, they suddenly vanished, along with a great deal of the planet's animal and plant life. NOVA examines a remarkable theory about the cause of the catastrophe—in which the first clue to the solution was a piece of clay.