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Scientists have finally untangled why shoelace knots fail.
First the core of the knot wiggles and loosens when shoes strike the ground.
Then, the swinging motion causes the lace ends to whip and pull apart the knot.
Using slow-motion video, they witnessed two stages of knot-slippage
Walking was the key: Neither impact or swinging alone was enough to undo the knots.
They used this controlled setup to calculate the slip rate of different knots
The square knot failed -50% of the time, while the granny knot always failed.
Scientists still don't know why certain knots fail.