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Scientists strengthen concrete by 30 percent with used coffee grounds
(www.engadget.com)
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this post was submitted on 25 Aug 2023
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Maybe they dropped old coffee grounds on their fresh concrete sidewalk while getting the trash out.
I always have these kinds of thoughts when reading articles like this.
On a serious note , I am pretty sure they find this stuff at the molecule level then match it to the closest item.
This is an area where AI might actually be really useful in the future. If that's not already the case.