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Hear the history of how time is measured - from primitive astronomy to modern precision clocks. Also, on Underreported: find out why the problem of huge plastic garbage patches in our oceans could be one of the most pressing environmental problems we’re facing today.

Join us for a Leonard Lopate Show film screening! On Tues., Feb. 3, we'll watch Frank Capra's "American Madness." Find out more and RSVP.