In Clive Cussler’s thriller Inca Gold, a crucial clue in an international treasure hunt is encoded in an ancient tangle of knotted, colored strands. Using a computer to identify patterns, an expert ...

Cut twine or string into 8 equal lengths of approximately 24-34 inches (depending on how large your container is). Knot the ends. Lay out the string on a flat surface and divide the 8 strings into 4 ...