According to astronomers, the big bang created both time and space about 14 billion years ago. Ever since, seconds and minutes have spooled outward, like an infinitely large ball of twine unraveling as it rolls on a ceaseless journey. Humans have long tried to affect this unraveling process, to make it happen more slowly or quickly. Einstein even predicted it was possible -- if we could travel at the speed of light. Unfortunately, most of us will never ride on the back of a light beam. Instead, we must be contented with the nonrelativistic speeds we can attain in jets and Jettas, which means we must also be satisfied with time that is universal and constant.