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Easy Leonardo Da Vinci's Inventions

What emergency aircraft did Leonardo da Vinci propose as a conical canopy that could descend safely?

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Intermediate Leonardo Da Vinci's Inventions

What flying-machine concept did Leonardo da Vinci sketch with a rotating helical rotor above a platform?

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Hard Leonardo Da Vinci's Inventions

What rotating-arm machine did Leonardo da Vinci design to measure wind speed?

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Hard Leonardo Da Vinci's Inventions

What machine did Leonardo da Vinci design with a humanoid armored figure inside?

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Intermediate Metallica's The Black Album 35th Anniversary

Which producer's 1989 album impressed Metallica enough to hire him for The Black Album?

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