Interesting Fact - Science
Researchers have worked out how shoelaces come undone. (Seemingly "knot failure" happens in a matter of seconds, and is triggered by a complex interaction of forces: These include the stomping of the foot, which gradually loosens the knot. The movement of the foot creates a whipping force which acts like hands tugging on the ends of the laces. Then as the tension in the knot eases and the free ends start to slide, a runaway effect takes hold whereby the knot suddenly unravels. They offered some advice to those plagued by this issue: The square knot is less likely to come unravelled compared with a granny knot. All in all it is a knotty problem.)