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Scientists strengthen concrete by 30 percent with used coffee grounds
(www.engadget.com)
This is a most excellent place for technology news and articles.
This is funny because when I was a plumber after particularly dirty days I used to wash my hands with cement and I used to think that made my hands feel smooth
Makes sense if you were working with strong acids. Bleach or baking soda might've had a similar effect.
Was domestic so plenty of urine from blocked drains I guess
Ah, I see what you mean now by "dirty".