I love days when the stock market is up. It generally means that something good is happening in the world, and that people are making money. Today was one of those days; the Dow Jones Industrial Average, one of the three main American indexes used to judge the health of the stock market, was up about 1% this morning. Then, a Twitter message sent to millions of users caused what is known as a flash-crash as people around the world saw what they thought may have been one of the most shocking news stories in a decade.
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