Science & Nature - Science & Nature: A Dragonfly Flaps Its Wings 20 To 40 Times A Second, Bees And Houseflies 200 Times, Some __________ 600 Times, And A Tiny Gnat 1,000 Times

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Science & Nature: A Dragonfly Flaps Its Wings 20 To 40 Times A Second, Bees And Houseflies 200 Times, Some __________ 600 Times, And A Tiny Gnat 1,000 Times

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