Engineers explain why shoelaces keep coming untied(mobile.nytimes.com)
mobile.nytimes.com
Engineers explain why shoelaces keep coming untied
https://mobile.nytimes.com/2017/04/13/science/why-shoelaces-undone-untied.html
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https://mobile.nytimes.com/2017/04/13/science/why-shoelaces-undone-untied.html
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