Stocks fell Tuesday on concerns that a deal to prevent a default by Greece might fall through. A slew of U.S. corporate earnings Tuesday also did little to bolster investors’ confidence. The Dow Jones industrial average closed down 33 points at 12,676. It has risen or fallen less than 100 points in 13 trading sessions, the longest calm stretch since March and April of last year. The Standard & Poor’s 500 lost a point to close at 1,315. It’s only the third time the S&P has ended lower this year - all those declines have been less than 7 points. So far this year, it’s up about 4.5 percent.