March 13, 2009 5:38 pm Traffic Could Trigger Heart Attack A German study found that people exposed to traffic are up to 3 times more likely to have a heart attack within a few hours. US & World Videos 1:45 NYPD enters Columbia University in riot gear to clear protest 4:28 ‘Apples Never Fall' and ‘Jurassic Park' star Sam Neill reveals his real name 3:21 Katy Perry's surprising regret about cheeseburger Met Gala look 1:49 New guidelines say women should be screened every other year for breast cancer starting at 40 2:28 King Charles returns to public duties amid cancer diagnosis