Numerology has long been part of our every day superstitions. And while we think of numbers as objective, in actuality we often attach to them special meaning. Perhaps we use our lucky number for the lottery, or maybe we avoid sitting at an unlucky seat number. Although, deep down we probably know such things are absurd. But when numbers really have unlocked some of the deepest mysteries of our world, maybe it is wise to be hesitant when you see you have reached your 13th session.