Tip Sheet

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We’ll get some tips about the etiquette of tipping during the holiday season. Then Jeffrey Wright and Mos Def talk about their roles in the Lincoln Center production of John Guare’s “A Free Man of Color.” Also, Joan Nathan tells us about her search for Jewish cuisine in France. Plus, our latest underreported segment takes a look at the widespread use of DNA databases in law enforcement, and why that may pose civil liberties problems.