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'Last Tango in Hailfax' returns for season four

After seven years of marriage, Alan and Celia discover that wedded bliss isn't always blissful. Clashing politics, Alan's new job and a wild local lad create tension. Caroline gets emotionally embroiled at work. Alan's brother visits. See what else unfolds in season four of "Last Tango in Hailfax."

'Great Performances at the Met' returns to Sundays at 9 a.m.

"Great Performances at the Met" brings the best of the Metropolitan Opera into the homes of classical music fans across the United States.

Nova: "How Writing Changed the World"

"Nova" explores new discoveries and how we have come this far on Wednesdays at 8 p.m. on Arizona PBS.