People were wrestling with this one long before headphones were even invented. In 1889, the comic writer Jerome K Jerome noted in Three Men In A Boat how rope can become tangled seemingly by itself.

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Surprisingly, the explanation was only discovered by mathematicians in 1988. Put simply, it turns out that, unless handled carefully, the chances of the free ends of stringy objects – such as headphone wires – going through the motions needed to make a knot increase rapidly with the length of the string or wire.

Happily, that leads to a simple way to cut the risk of tangles: get rid of the troublesome free ends by clipping the earbuds and the jack together to form a loop – using, say, a plastic hairgrip.

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Authors

Robert is a science writer and visiting professor of science at Aston University.

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