Stocks held near session lows in late trading Tuesday. The NYSE composite lost 1.8% and the Dow 1.4%. Both were on pace to close below their 50-day moving averages for the first time in nearly three months. The Nasdaq dropped 1.5% and the S&P 500 fell 1.4%. Volume continued to track higher on the NYSE and slightly lower on the Nasdaq. Bruker (BRKR) dropped 4% and was on pace to snap a four-session win streak. The developer of materials research