Being atop a skyscraper when it sways is disconcerting, but not as terrifying as that sway would be if it weren't for mass dampers. This simple but thorough explanation of how they work from Minute Physics uses a LEGO Saturn 5 rocket, or two of them, to show how it works. The video is really only 3:40 long; after that, it's an ad. -via Geeks Are Sexy
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