So there's still no clear explanation for what just sent the Dow on that ridiculous slide. But the questions are starting to come faster and faster. A biggie: What was the role of computerized trading to blame?

On a related point, a few have pointed out some rather strange action in Procter & Gamble shares. A P&G spokeswoman said the company doesn't know what might have caused a sudden drop and said that it is looking into the matter, according to the Dow Jones reporter covering the company. Any ideas? Just a fat-finger trade?

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