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The nature of time is an age-old conundrum for physicists, philosophers, biologists and theologians. The Newtonian picture of time—a kind of cosmic clock that ticks off time in a manner that applies identically to everyone and everything—tightly aligns with our experience. But with special and general relativity, Einstein showed the fallacy inherent in experience: the rate at which time elapses depends on circumstance and environment. These discoveries raise even more basic, long-standing puzzles: What is time? Is it a fundamental feature of reality or something we humans impose on experience? Does time come into existence with the universe or does it transcend it? Why does time exist at all?
Ira Flatow is the host of Science Friday on PRI, Public Radio International. He anchors the show each Friday, bringing radio and Internet listeners worldwide a lively, informative discussion on science, technology, health, space and the environment. Flatow is president of ScienceFriday, Inc. and founder and president of Science Friday Initiative.Read More
Craig Callender is a professor of philosophy at the University of California, San Diego. His work focuses on the philosophy of science, especially physics. He has a lifelong interest in the mysteries of time. By attacking the problems associated with time through interdisciplinary means—especially physics, philosophy and psychology—he hopes to show how our manifest image of time arises in creatures like us.Read More