Is it possible to tie a knot that you can’t untie? According to legend, the Gordian knot resisted all attempted solutions until the year 333 B.C.. In fact, the knot was highly problematic until Alexander the Great came. Not known for his lack of ambition when ruling Asia, he cut through it with a sword. “Cheat!” you might cry. However, you might have been unwise to point it out in Alexander’s presence. His method did seem to go against the whole spirit of the problem. The challenge was to solve the puzzle solely by manipulating the knot, not by cutting it….