"Nature has been kind to us by being governed by universal laws, rather than by mere parochial bylaws. A hydrogen atom on Earth... or even in a galaxy that is ten billion light years away, behaves in precisely the same manner. And this is true in any direction we look and at any time. ...such properties ...are called symmetries and they reflect immunity to changes in location, orientation, or the time... If not for these (and other) symmetries, any hope of deciphering nature's grand design would have been lost..."