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915
0
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619
3
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514
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527
2
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680
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565
1
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498
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7
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36
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383
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458
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10
585
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2
839
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Science Continued...
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2002
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675
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586
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654
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791
Science Continued...
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484
A new means of space propulsion... closed loop pulse propulsion... here's the idea [View all]
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521
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594
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2
591