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A ‘magic number’ of people can make a bridge sway

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Added by The Angry UFOlogist in Science
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We thought walking in lock step made bridges sway, like London’s Millennium Bridge when it opened. But it turns out crowd size matters more than rhythm. Read more: https://www.newscientist.com/article/2152834-a-magic-number-of-people-walking-across-a-bridge-makes-it-sway/

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