Imagine trying to catch up to something moving close to the speed of light – the fastest anything can move — and sending ahead information in time to make mid-path flight corrections. Impossible? Not quite. Physicists at the Relativistic Heavy Ion Collider, a particle accelerator, have achieved this tricky task — and the results may aid in the quest to understand the inner workings of the early universe. Already, RHIC scientists have learned that mere microseconds after the Big Bang, the universe was more interesting than imagined – a nearly “perfect” liquid with virtually no viscosity and strong interactions among its constituents.