TOKYO -- A Japanese man who developed the world's smallest helicopter will take flight in the birthplace of Leonardo da Vinci in tribute to the Renaissance genius' idea. Gennai Yanagisawa, 75, said ...
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A kind of helicopter design first envisioned by the Renaissance-era Italian polymath Leonardo Da Vinci could help develop quieter and stealthier modern drones, according to a new study. Drones produce ...
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