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Da Vinci addresses the importance of lightweight structures and illustrates the structure of a mechanical wing in the codex on plans for human flight.

Da Vinci addresses the importance of lightweight structures and illustrates the structure of a mechanical wing in the codex on plans for human flight.

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Best combat rifles of all time

A combat rifle is a military service rifle that fires a full-power rifle cartridge, a mainstay of every modern army in the world. See the best combat rifles ever made.