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Guests discuss weather patterns, climate change, and how this influences our future.
Paleontologist Dr. Larry Agenbroad describes early work at the Mammoth Site.
The son of the man who discovered some old bones was in the right place at the right time.
The man who discovered the first bones at the Hot Springs Mammoth Site describes the find.
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Find out what causes emotions to reach the boiling point.
Find out why both the prime minister and an old MI5 colleague want Johnny back.
FRONTLINE and ProPublica investigate the secret history of Firestone in Liberia.
See an exclusive preview of Downton Abbey Season 5.
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