Season 4 Episodes19
E1 7.9Hitler's Secret Weapon
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E2 8.1The Hot Blooded Dinosaurs
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E3What Price Coal?
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E4 7.6The Sunspot Mystery
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E5 7.2The Plastic Prison
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E6Incident at Brown's Ferry
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E7Bye Bye Blackbird
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E8The Pill for the People
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E9Now viewingThe Gene Engineers
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E10The Human Animal
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E11The Wolf Equation
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E12The Dawn of the Solar Age
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E13The Business of Extinction
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E14 7.7The Red Planet
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E15Tongues of Men (1)
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E16Tongues of Men (2)
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E17 8.0Linus Pauling: Crusading Scientist
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E18Across the Silent Barrier
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E19The New Healers
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