This might be one of the most common summer debates with friends, coworkers, and neighbors: does cracking the window of your car while it’s parked actually help keep the car cool? It seems like a simple premise, but most of us don’t cart around thermometers and such to do a scientific experiment and find a definitive answer. Instead, most of us rely on personal experience and other summer car tips to keep cool. Luckily, the geeks at Science Blog have put together a (mostly) scientific test to see what really matters. An Open and Shut Case Using two cars that were similar in size, shape, and color, a pair of vehicle owners set out to determine once and for all