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Episode 5: The Calling

The Calling

Season 4 Episode 5
53:05
When Whales Could Walk

When Whales Could Walk

Season 51 Episode 1
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Tuberculosis: The Forgotten Plague

Tuberculosis: The Forgotten Plague

Season 6 Episode 5
26:49
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Cancer: The Emperor of All Maladies

Causes of Cancer

After smoking and obesity the causes of cancer remain elusive and varied.
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