http://www.sciencedaily.com/releases/2013/01/130110142129.htm
Taking advantage of the fact that, in nature, matter can be both a particle and a wave, he has discovered a way to tell time by counting the oscillations of a matter wave. A matter wave's frequency is 10 billion times higher than that of visible light. "A rock is a clock, so to speak," Müller said. <end excerpt> Fascinating article.
