Stocks went on a roller coaster ride Wednesday as European leaders warned that Greece may soon exit the euro, sending the Dow down to its lowest point since January at one point during the day. Most of the descent came among financial stocks, but Dell also fell a staggering 18 percent, its biggest loss since 2000. Facebook, another stock being closely watched since its disastrous IPO last week, ticked up 2.8 percent following a 19 percent drop over the past few days. The Dow made a small climb to close the day, losing 6 points to close at 12,496.
