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MICHEL MARTIN, HOST:

I'm Michel Martin and this is TELL ME MORE, from NPR News. Coming up, all kinds of folks made their debut on Twitter this year, including His Holiness, Pope Benedict XVI. We decided we wanted to talk about the best and worst of 2012 on Twitter. That's coming up later in the program.

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MICHEL MARTIN, HOST:

I'm Michel Martin, and this is TELL ME MORE, from NPR News. Coming up, are you invited to any parties for Kwanzaa, which is going on now? If the answer is yes, you're not alone. If the answer is no, you're not alone, either. We'll ask just how widely observed is this inspired-by-Africa, made-in-America celebration.

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MICHEL MARTIN, HOST:

The tortuous negotiations involved in the "fiscal cliff" talks are like a chess game.

To shed some light on the kinds of negotiation techniques that members of Congress might be using during the talks, we asked two negotiators to walk us through their tactics with examples from their everyday lives.

Longshoremen and East Coast and Gulf Coast port operators have agreed to an extension on labor negotiations, a federal mediator said Friday, averting a potentially crippling strike that would have halted container traffic at many of the nation's largest seaports.

Update at 4:45 p.m. ET: The temporary deal extends the contract to Feb. 6.

In A Man of Misconceptions: The Life of an Eccentric in an Age of Change, John Glassie writes of 17th-century Jesuit priest and scientist Athanasius Kircher, a renaissance man who studied magnetism, Mount Vesuvius, even the blood of plague victims. The only problem? His theories were often wrong.

Did you know that the human overbite may have evolved after people began using forks and knives? In Consider the Fork, author Bee Wilson traces how kitchen tools--from knives to pots to gas stoves--have changed over time, and how they have influenced what, and how, we eat.

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