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#1
12th April 2017, 01:35
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Shoe string theory
A new study by mechanical engineers at UC Berkeley finally shows why your shoelaces may keep coming untied. It's a question that everyone asks, often after stopping to retie their shoes, yet one that nobody had investigated until now. The answer, the study suggests, is that a double whammy of stomping and whipping forces acts like an invisible hand, loosening the knot and then tugging on the free ends of your laces until the whole thing unravels.
Read more at: https://phys.org/news/2017-04-shoe-s...ntied.html#jCp 
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