There are plenty of things about driving to make your blood pressure rise: screaming kids in the back, crappy songs on the radio, rising gas prices, idiot drivers who don't know what they're doing and need to get off the phone and keep their eyes on the road and... Whew, sorry, got a little hot under the collar there. Anyway, researchers from Egypt just published a study in BMC Physiology identifying another ubiquitous aspect of driving that could be making drivers angier: gas fumes. The scientists exposed some rats to fumes of leaded gas (which you can still buy in Egypt) and others to unleaded, but both groups became more prone to chattering their teeth, arching their backs, and biting. From Wired.com