Now, using algebraic topology, researchers from the UK have developed a scheme for creating optical vortices in propagating laser fields to form knots and links (Nature Phys. 6, 118–121 ...
The knot that is most commonly used for tying into a harness is the Figure 8 Follow-through (or rewoven Figure 8 ... These calls are designed to be easy to remember. The basic sequence goes 4, 3, 2, 1 ...
We tie our shoes, we put on neckties ... The knots ranged from one of the strongest basic knots in existence, the reef knot, to one so weak that it can unravel if gently nudged, the aptly named ...