Like the science of tilt-and-turn windows. Or as we call them in Germany: windows. I must admit I do find American windows - weird when I see them in the movies. Pushing them up, meaning you can only open half of them, and always feeling like it could come crashing down on you when you try to look out. I guess even looking out of a window is a dare for Americans...:)

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This is how a window works when you pout some engineering into it: