On this day: January 21
Louis XVI is guillotined, the first nuclear-powered submarine launches, the nation catches "Saturday Night Fever," and President Reagan's second inauguration heads indoors, all on this day.
2008: Worldwide stock markets slump in a day that will be labeled "Black Monday." The London Stock Exchange's FTSE 100 index sees its biggest ever one-day points fall, European stocks close with their worst results since Sept. 11, 2001, and Asian stocks drop as much as 14 percent.
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