Why Your Shoelaces Keep Coming Undone

April 17, 2017

Why Your Shoelaces Keep Coming Undone

Science! It has helped explain the mysteries of the universe. The source code of human genetics. The very properties of matter. And now: shoelaces. Engineers at UC Berkeley recently analyzed how, exactly, the knot you tie in your shoelaces comes undone–short answer: the force of your foot hitting the ground + the swinging nature of your gait loosen and ultimately pull it apart. At which point you scowl and re-tie. Watch the surprisingly hypnotic video the team made of a runner’s laces seemingly spontaneously slipping apart mid-stride.

The solution? Generally, stronger knots. I endorse the reef knot, as explained in Put This On’s shoe episode by Adam Lisagor. With apologies to grannies everywhere: the traditional granny knot won’t cut it (unlike the maligned granny-style freethrow, which is making a comeback). Also an option: loafers.


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