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Why do some semi truck exhausts have metal flaps on top?
Once the exhaust flow slows, the flap snaps shut to seal the pipe. This keeps out rain, dirt, and anything else that might ...
Techno-Science on MSN3d
🚆 The most dangerous pollution from cars: is it really from the exhaust pipe? 💨
Are tires more dangerous than exhaust gases? A recent study reveals this surprising truth, highlighting an often overlooked ...