No matter how carefully you place a pair of earbuds into your pocket, they emerge in a knot.
Scientific research (dataset: 3415 trials) has shown that strings shorter than 0,5 meter never tangle, buts as a string gets longer, the probability of knots shoots up sharply.
Follow-up research (dataset: 12000 trials) shows that by connecting the plug and the buds (so that the wire forms a loop) reduces the change of knots by a factor of 10.
Experience from rescue squads (who hang from cliffs and helicopters, where tangled rope can prove fatal) provides the best approach: don't roll up the wire, but instead put one end of the string in your pocket, and then feed the rest in (keeping the ends away from each other).
(c) Judy Dutton, in Wired
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