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What machine did Leonardo da Vinci sketch using a helical rotor to lift into the air?
Answer
Aerial screw
What self-propelled device did Leonardo da Vinci design for moving without an animal?
Answer
Self-propelled cart
Which Leonardo da Vinci invention is often described as an early armored vehicle?
Answer
Tank
In Leonardo da Vinci's inventions, what device did he design to resemble a bird's flapping wings?
Answer
Ornithopter
How many copies of Metallica's The Black Album had sold worldwide by the album's later sales reports?
Answer
Over 30 million
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What self-propelled device did Leonardo da Vinci design for moving without an animal?
Answer
Self-propelled cart