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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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Crazy Celebrity Tattoos

Tattoos are more popular than ever, but don’t let your kids get something like this. Check out the craziest tattoos celebrities have shown off and the ones they came to regret.