https://www.npr.org/2020/01/02/793050811/a-knotty-problem-solved

A Knotty Problem Solved

1/3/2020 - Heard on All Things Considered. Special fibers that change color when they are under strain have helped scientists come up with some simple rules that can predict how a knot will perform in the real world. There's a whole field of mathematics that studies knots, to explore abstract properties of… SEE MORE