Wall Street sinks again as Fed chair warns on virus threat

Stocks are falling in early trading on Wall Street Wednesday, tacking on more losses to their end-of-day slide from a day before.The market has been wavering the last couple weeks after coming off its best month in a generation, as optimism about reopening the economy collides with worries about the dangers of lifting restrictions too soon.The S&P 500 was down 0.7% after the first 30 minutes of trading, following up on its 2.1% loss from Tuesday. Markets around the world were showing caution