This high-interest NOVA video documents the efforts of scientists to unravel the mystery of the extinction of the dinosaurs 65 million years ago. Now linked to the impact of a large asteroid with the earth, scientists have recently explored the center of the crater, which is located in northern Yucatan, Mexico. Drilling expeditions have returned samples of the rocks beneath the crater's center, and they reveal the progress and aftermath of the impact. The PDF download contains the 46 question vi