This is a unique time in science, one that will witness a change in the understanding of gravity, one of the four fundamental forces of nature. This change is shepherded by the imminent detection of gravitational waves. Facilities such as the Laser Interferometer Gravitational-Wave Observatory (LIGO) are now operational and conducting searches.  Fundamental to the success of the search for gravitational waves is the theoretical modeling of the sources that produce them. Over the past year, numerical relativity has begun to successfully solve Einstein's equations governing gravity for the strongest source of gravitational waves, the final few orbits and plunge of two black holes.  Taken together with gravitational wave detection, these models probe the mysteries of relativity by interpreting what nature is telling us about gravity.