Though stocks closed on a high note Wednesday, marking a four-day gain, all three major indexes were still down more than 4 percent and logged their worst August in 10 years. The day's losers included AT&T, which fell more than 4 percent after the Justice Department moved to block its acquisition of T-Mobile. But the Dow Jones is sneaking into positive territory, up more than 150 points at its session climax and closing Wednesday up 53.58 points at 11613.53. A key volatility index fell significantly, too, indicating a large drop in market fear.