The Universal Timekeeper: Reconstructing History Atom by Atom - featuring David Helfand / Columbia University

By utilizing the basic building blocks of matter as imperturbable little clocks, we are now able to reconstruct in quantitative detail a remarkable range of human and natural events. From the discovery of art forgeries and the dating of prehistoric archeological drawings, to a detailed history of human diet and the Earth's climate, to the events surrounding the death of the dinosaurs, the origin of the Solar System, and the history of the Universe itself, the universal timekeepers provide us with a precise chronology from the beginning of time to the moment humans emerge to contemplate such questions.