It's not your fault: Basic physics is the reason why your headphones keep tying themselves in knots, Business Insider reports. Researchers at the University of California, San Diego, demonstrated that whereas cords less than 46 centimeters long will almost never tangle, any cord longer than 150 centimeters will have at least a 50% chance of spontaneously knotting up. Apple earbuds measure in at 139 centimeters, putting it right at the edge of the 50% entanglement zone.
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