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Clip: Season 44 Episode 20 | 1m 49s
Crows can remember the face of their captors—even after generations.
Aired: 12/20/17
National corporate funding for NOVA is provided by Draper. Major funding for NOVA is provided by the David H. Koch Fund for Science, the Corporation for Public Broadcasting and PBS viewers.
Experts drill into the impact crater of an asteroid that created a worldwide cataclysm.
NOVA uncovers the secrets of nature’s battleground—claws, horns, fangs and all.
Scientists uncover geologic evidence of epic floods that tore through ancient landscapes.
Experts reconstruct the Great Hurricane of 1780 to help predict the risk of future storms.
Scientists hunt for a mega-eruption that plunged medieval Earth into a deep freeze.
How has China’s magnificent Forbidden City withstood centuries of earthquakes?
Discover the world of medieval knights and see how their armor was made.
Follow Cassini's final days as it skims the cloud tops before plunging into the planet.
The country’s first solar eclipse in 99 years will cast a light on the Sun’s secrets.
