Two complementary effects tag team to untie a runner's shoelace in this video, shot with a high-speed camera. Each time the runner pounds her feet into the treadmill, the impact causes the knot to stretch and begin to loosen. As she swings her legs, inertia pulls the shoelace's ends forward, tugging them out of the knot, which reveals little sign of its impending doom until the last few strides.
Science News
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