"This looks like a corkscrew!" says Carmine. "This is a classic Renaissance idea. I'll bet Leonardo noticed that corkscrews can push ships through water, so he wondered if they could lift helicopters into the sky?

"It wouldn't actually work, but it shows how his ideas were based on observing the real world. Looking closely at nature was a revolutionary idea—it was only a hundred years later that Galileo turned his telescope to the night sky to discover Jupiter's moons!

"So I really think that Leonardo made this sketch. Why don't you try another one?"

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