News HeadlinesCNBC staff and wire reports | May 06, 2010 | 04:10 PM EDT In one of the most dizzying half-hours in stock market history, the Dow plunged nearly 1,000 points before paring those losses in what possibly could have been a trader error. According to multiple sources, a trader entered a "b" for billion instead of an "m" for million in a trade possibly involving Procter & Gamble [ PG 60.75 -1.41 (-2.
