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Episodes Season 4
Specials13 eps
Season 113 eps
Season 217 eps
Season 320 eps
Season 419 eps
Season 521 eps
Season 619 eps
Season 720 eps
Season 820 eps
Season 919 eps
Season 1021 eps
Season 1120 eps
Season 1220 eps
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Season 2120 eps
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Season 3016 eps
Season 3118 eps
Season 3218 eps
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Season 5018 eps
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Season 5318 eps
01
Hitler's Secret Weapon
02
The Hot Blooded Dinosaurs
03
What Price Coal?
04
The Sunspot Mystery
05
The Plastic Prison
06
Incident at Brown's Ferry
07
Bye Bye Blackbird
08
The Pill for the People
09
The Gene Engineers
10
The Human Animal
11
The Wolf Equation
12
The Dawn of the Solar Age
13
The Business of Extinction
14
The Red Planet
15
Tongues of Men (1)
16
Tongues of Men (2)
17
Linus Pauling: Crusading Scientist
18
Across the Silent Barrier
19
The New Healers











