For decades, farmers have been using acetylene-powered "hail cannons" as a method to protect their delicate crops from the devastating effect of hailstorms. They function, on a basic level, by generating shockwaves that aim to break up falling hailstones. Now in smaller pieces, the fragments melt quickly and fall as rain. But do they really work?
Scientists have called them "pseudoscience" for years, but farmers seem convinced.
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