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With our extensive knowledge of biomechanics, aerodynamics as well as modern synthetics that enabled us to build ultralight, ultrastrong materials, why didn't we invent a personal flying machine based on flappy wings similar to real birds?
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Why is the week 7 days?
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With our extensive knowledge of biomechanics, aerodynamics as well as modern synthetics that enabled us to build ultralight, ultrastrong materials, why didn't we invent a personal flying machine based on flappy wings similar to real birds?
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Why is the week 7 days?
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