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What Caused the Dinosaurs to Go Extinct?
How did an asteroid impact on one side of the planet cause global devastation?
NOVA
Forgotten Genius
The story of how African-American Percy Julian defied the odds to become a famous chemist.
NOVA
Hunt for the Oldest DNA
Follow the quest to recover DNA millions of years old for the very first time.
NOVA
Making North America: Life
How did massive volcanic eruptions, inland seas, and land bridges pave the way for life?