Tie a trefoil knot in a piece of string, seal the ends together, and try to wiggle it free without cutting. In three-dimensional space, the knot holds firm. Add a fourth spatial dimension, however, ...

A Q&A with a veteran knot theorist discusses the strange origins of the discipline, as well as its modern-day applications. This field of mathematics, rich in aesthetic beauty and intellectual ...

Find a string. Really. Do it. Now twist, tie and tangle it as much as you like. Finally, attach the two loose ends of your string together to make a closed loop. (This is a crucial step.) What you ...

Add Yahoo as a preferred source to see more of our stories on Google. For many of us, untangling our earbuds is the extent of our survivalist knot knowledge. Tying knots is just for sailors and ...