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Lego Antikythera Mechanism
Teachable Moment: It's easy to dismiss this as "I guess some people will try to build anything with Lego" but it highlights how simple building blocks (OK... it uses some differential gears which aren't that "simple") when properly and cleverly combined can make complex computations.
In 1900 divers retrieved a complex mechanical device from the Antikythera shipwreck. It wasn't until 2006 that high resolution X-Ray tomography revealed that the mechanism as used for highly accurate astronomical predictions.
So of course, someone had to figure out how to make this device using Lego. And 1500 Tecnic pieces, 110 gears and 30 days later... they did... and made this video.