#74918
Mentioned in 1 episodes

Gravity's Engines

Book •
Author
Caleb Scharf

Mentioned by

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 Michael Shermer
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 Caleb Scharf

Mentioned in 1 episodes

Mentioned by
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Michael Shermer
 as one of
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Caleb Scharf
's popular science books.
Are We Meant to Leave Earth? Why Humanity May Have No Choice but to Go to Space

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