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Used coffee grounds make concrete 30% stronger
(www.livescience.com)
just science related topics. please contribute
note: clickbait sources/headlines aren't liked generally. I've posted crap sources and later deleted or edit to improve after complaints. whoops, sry
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I don't screen everything, lrn2scroll
Especially when coffee grounds are a wonderful addition to compost, and help the breakdown of the rest of the material.
Large scale composting of all organic material (or even small scale, really) is much more efficient and impactful than trying to collect only coffee grounds for this purpose.