The coffee grounds are pyrolyzed at 500 degrees and then incorporated into the concrete mix. Awaiting longevity tests before going to market.https://www.sciencealert.com/scientists-discover-an-amazing-practical-use-for-leftover-coffee-grounds
That's a good thing, because (remarkably) we're running out of sand - at least, 3:21 the rough-edged sand that's good for binding concrete together.
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