Expanding the Universe

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Only 4 percent of the universe is understood by astrophysicists, and we’ll look at what makes up the other 96 percent: dark matter. Also, soprano Sondra Radvanovsky talks about performing the title role in the Metropolitan Opera's new staging of Puccini’s Tosca! Then, Paul Clemens follows the closing of a Detroit auto plant. Plus, our word maven Patricia T. O’Connor takes your calls on English...and why some people believe there are conspiracies to control language.