Host Jack Barry conducts questioning of contestants James Snodgrass (left) and Hank Bloomgarden (right) in supposed isolation booths during the program Twenty-One. Albert Freedman, producer of the show, died on April 11 at age 95. AP hide caption

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AP

Author Robert Pirsig and his son Chris in 1968. Pirsig, who wrote Zen and the Art of Motorcycle Maintenance, died Monday at age 88. William Morrow/HarperCollins hide caption

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William Morrow/HarperCollins

The Anti-Defamation League counts 541 incidents of anti-Semitism since the year began. That includes vandalism of Jewish burial grounds, including the Mount Carmel Cemetery in Philadelphia in February. Jacqueline Larma/AP hide caption

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Jacqueline Larma/AP

In "The Fish on My Plate," author and fisherman Paul Greenberg sets out to answer the question "what fish should I eat that's good for me and good for the planet?" As part of his quest to investigate the health of the ocean — and his own — Greenberg spent a year eating seafood at breakfast, lunch and dinner. Courtesy of FRONTLINE hide caption

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Courtesy of FRONTLINE

K.K. DuVivier stands by a smart meter that sends electricity back to her utility, Xcel Energy. The Denver home gets credits from Xcel for power that's added back to the grid. Grace Hood/Colorado Public Radio hide caption

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Grace Hood/Colorado Public Radio

As Rooftop Solar Challenges Utilities, One Aims For A Compromise

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'Politico' Details Trump's Relationship With Conservative Media

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As Tensions Rise, Experts Question Threat Level Posed By North Korea

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Harvard Project Outlines Pattern Of Attorney Failures In Arkansas Death Row Cases

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Hacking Lake Erie: Tech Competition Seeks Solutions To Water-Related Problems

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Writer Recalls Undergoing Female Genital Mutilation In The U.S.

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Trump's Platform Remains Unclear As President Reaches 100 Days

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Obama Re-Enters Public Eye At Community Engagement Panel In Chicago

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In New Orleans, Officials Remove First Of 4 Confederate Monuments

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U.S. Tobacco Profits Soar Despite Drop In Number Of Smokers

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Treasury Secretary Steven Mnuchin talks to reporters during Monday's press briefing at the White House. Mnuchin announced sanctions against 271 employees of Syria's Scientific Studies and Research Center. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images