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senglish
Oct 12, 2018
Designing and testing parachutes. A lesson in gravity and air resistance.
Designing and testing parachutes. A lesson in gravity and air resistance.
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senglish
Oct 12, 2018
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senglish
Oct 12, 2018
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senglish
Oct 12, 2018
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senglish
Oct 12, 2018
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senglish
Oct 12, 2018
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senglish
Oct 12, 2018
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senglish
Oct 12, 2018
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senglish
Oct 12, 2018
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