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Tire "eyebrows"
I've noticed car manufacturers are now putting little flaps in the underbody, projecting down, just in front of the tires. What is that about? Is it an efficiency measure?
Seems to me they would work better if larger and lower, and angled so the air exits outside rather than under the car. It would be pretty simple to screw larger flaps right to the original ones. The chloroplast would be "sacrificial" so you could put it quite a bit lower toward the ground, and not worry if it hit something.
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