A Knotty Puzzle: Solution

Last month's puzzle challenged students to tie a simple overhand knot in a piece of yarn by picking up the yarn by its ends and not letting the ends go until after the knot had been tied. In solving this puzzle you must first make a knot with your arms. To do this, bend both arms at the elbow. Place your right hand under your left upper arm with your right forearm resting on top of your left forearm. Next, lift your left hand so that it is above your right upper arm. You have now made a not with your arms. Reach down and pick up the ends of the yarn with your hands (this takes some flexibility and may be easier for you students than it is for you). Pull your arms apart and the knot will be transferred to the yarn.