Updated:Wall Street had its head handed to it in another major sell-off. The Dow tumbling 326 points, now down more than 7 percent since the start of the year. The S&P 500 nose-diving to an October closing low. And the Nasdaq suffering its first triple-digit plunge in more than two years. Money leaving the stock market continues to pile into the bond market, pushing yields on the 10-year note to the lowest since November.