You can tie as many butterfly knots into a single line of rope as needed, which is especially handy with multiple climbers on a line of rope. But it's not just useful for climbing. The alpine ...

Here's how to tie three classic knots. Produced by Justin Gmoser Follow BI Video: On Facebook More from Lifestyle Your tie can really accentuate an outfit and send a message of confidence.

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 art of tying knots goes beyond shoelaces. Delve into the physics and history of knots, and how our understanding of their security may be flawed.