NOVA S8E8 The Asteroid and the Dinosaur

NOVA Season 8 Episode 8 Online – For 150 million years, non-avian 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.