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Dec. 23: Nightly News Monday broadcast

20:34

Could a credit-card chip be the secret to security?; Extreme weather brings frigid temps and record highs; Marines set to rescue Americans in Sudan; Health care enrollment deadline extended; Spacewalk set for tomorrow; Imprisoned Pussy Riot members freed; Study: Pregnant women don’t have to avoid nuts; AK-47 inventor Mikhail Kalashnikov dies; John Eisenhower dies at age 91; Farewell, Candlestick Park; Window washers bring Christmas cheer to sick kids