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Why did the US adopt 120v60hz as standard vs the much more widely used 220v50hz that most of the world uses?
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What prevents us from building an observatory on the moon?
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Why did the US adopt 120v60hz as standard vs the much more widely used 220v50hz that most of the world uses?
36
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9
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1
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What prevents us from building an observatory on the moon?
1
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