Getting into a car that's been baking in the heat is among the most unpleasant parts of summer. The air inside a car can get much hotter than the air outside—according to one study , a car's interior can reach 99°F in just 10 minutes on an 80°F day—and it also grows stale and stuffy from being trapped inside.

Fry then demonstrates the trick, which she says she uses regularly, though she warns it will make you look a bit goofy. Check out the video below, and read on for a how-to.

How to Do It

As Fry shows in the video, with the car parked, roll the passenger side rear window all the way down. Then, standing outside the car, rapidly open and close the driver's side door a few times. Simple!

What's going on? Fry, who has a PhD in fluid dynamics—the study of how liquids and gases, includ

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