Arctic blast and cold warnings

Authorities in the disappearance of Nancy Guthrie say they believe she's still out there. Tony Dokoupil speaks with former FBI agent Katherine Schweit to break down the case.

Face the Nation's Margaret Brennan says why she thinks the world could be a more dangerous place following the world's largest nuclear powers plan to limit their nuclear arsenals.

And, new bill in Florida expands the vaccine exemptions for parents.

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