Black Monday: What can we learn from it 25 years later?

      |Black Monday -- Oct. 19, 1987 -- was the worst single day of trading in Wall Street history, with the Dow Jones losing 22.6 percent of its total value. Jill Schlesinger, editor-at-large for CBS MoneyWatch.com, explains what we can learn from that day and has tips for how investors can protect themselves from the next crash.

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