At the beginning of the 20th century Einstein changed the way we thinkabout Nature. At the beginning of the 21st century Einstein'sthinking is shaping one of the key scientific and technologicalwonders of contemporary life: atomic clocks, the best timekeepersever made. Such super-accurate clocks are essential to industry,commerce, and science; they are the heart of the Global PositioningSystem (GPS), which guides cars, airplanes, and hikers to theirdestinations. Today, atomic clocks are still being improved, usingatoms cooled to incredibly low temperatures. Atomic gases reachtemperatures less than a billionth of a degree above Absolute Zero,without freezing. Such atoms are at the heart of Primary Clocksaccurate to better than a second in 80 million years as well as bothusing and testing some of Einstein's strangest predictions.This will be a lively, multimedia presentation, including experimentaldemonstrations and down-to-earth explanations about some of today'smost exciting science.