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The massacre in Pittsburgh was one of the worst attacks against the Jewish community in the United States in decades. The city\u2019s mayor called it \u201cthe darkest day of Pittsburgh\u2019s history.\u201d Guests: Kevin Roose, who writes about technology for The New York Times, and Campbell Robertson, a national correspondent for The Times. For more information on today\u2019s episode, visit nytimes.com/thedaily.