Art Bell interviews Dr. Anthony Rizzi, a theoretical physicist who earned degrees from MIT, the University of Colorado, and Princeton, and who served as the first scientist at Caltech's LIGO gravitational wave observatory. Rizzi explains his discovery of the first definition for angular momentum in general relativity, describing how gravity waves rippling through space make it nearly impossible to find a stable reference point for measurement. The conversation turns to time travel, where Rizzi… Full show notes & guests: https://artbellarchive.org/episode/november-6-2004-philosophical-physics-dr-anthony-rizzi