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One of the things that I remember reading about the leading edge of wings is that they could be angled with a hard edge if they would only be flown at a particular angle against the wind. The blunt/rounded (teardrop) shape lets them move through the wind at a wide range of angles without generating turbulence.
In a car, we drive forward, but we encounter x-winds; a hard/pointy edge on the front might work for head on, but it would generate an eddy in a x-wind.
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