-- A link between diet soda and depression.

-- "The heavily tattooed artist and professor ... has surprisingly moderate political views."

-- New Mexico Gov. Susana Martinez, a Republican, says her state will expand Medicaid.

-- What it's like to experience new technology after 25 years in jail.

-- The guy who used to run security for the U.S. Mint explains how one would guard a $1 trillion coin.

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Sarah Kliff · January 9, 2013