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