Distributia
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Erik ThompsonNarrator
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Michio KakuHimself - Author, 'Physics of the Impossible'
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Russell SchweickartHimself - Former Astronaut, B612 Foundation (as Rusty Schweickhart)
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Grant StokesHimself - M.I.T. Lincoln Observatory
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Alex FilippenkoHimself - Univ. of California, Berkeley
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Ed LuHimself - Former Astronaut, B612 Foundation
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Amy MainzerHerself - NASA / JPL
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Don YeomansHimself - NASA / JPL