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The Planets: Inner Worlds

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Rise of the Mammals

Rise of the Mammals

Season 46 Episode 17
53:27
Why Bridges Collapse

Why Bridges Collapse

Season 46 Episode 18
53:25
Decoding da Vinci

Decoding da Vinci

Season 46 Episode 21
53:31
Polar Extremes

Polar Extremes

Season 47 Episode 1
1:52:46
Dog Tales

Dog Tales

Season 47 Episode 2
53:21
Cat Tales

Cat Tales

Season 47 Episode 3
53:21
Nature's Fear Factor

Nature's Fear Factor

Season 47 Episode 9
53:21
Human Nature

Human Nature

Season 47 Episode 11
1:33:41
Can We Cool the Planet?

Can We Cool the Planet?

Season 47 Episode 16
53:31
Beyond the Elements: Reactions

Beyond the Elements: Reactions

Season 47 Episode 17
53:31
Beyond the Elements: Indestructible

Beyond the Elements: Indestructible

Season 47 Episode 18
53:30
NOVA Season 47

Beyond the Elements: Life

Season 47 Episode 19
53:32
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NOVA

The Planets: Inner Worlds

Season 46 Episode 12

The rocky planets—Mercury, Venus, Earth and Mars—were born of similar material around the same time. Yet only one of them supports life. Were Earth's neighbors always so extreme? And is there somewhere else in the solar system life might flourish?

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