stoutfellow: Joker (Joker)
stoutfellow ([personal profile] stoutfellow) wrote2019-04-14 02:33 pm
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Nuts!

Learn something new every day... Apparently crushed walnut shells used to be used to clean jet engines (and are still used for smaller engines). They're tossed into the running engine, where they have the right abrasiveness to scrape off gunk, and they wind up being incinerated without causing further problems.
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