Stocks were sharply lower Monday afternoon, but have eased off their worst levels of the session. The Nasdaq was down 1.2%, led by big caps Apple (AAPL), Google (GOOG) and Amazon.com (AMZN). The Dow Jones industrial average and the S&P 500 were off by 0.9%. All three were down between 1% and 1.4% at Monday's lows. On the plus side, volume continued to track lower across the board. Celgene (CELG) slumped 3% and wiped out Friday's gain. The stock