From: here@is.invalid   
      
   Scientists Discovered an Amazing Practical Use For Coffee Ground Waste   
      
   Charred coffee grounds could make concrete up to 30 percent stronger,   
   scientists in Australia found.   
      
   Their clever recipe could solve multiple problems at once.   
      
   Each year, the world produces about 10 billion kilograms (22 billion   
   pounds) of coffee waste, most of which ends up in landfills   
      
   https://www.sciencealert.com/scientists-discovered-an-amazing-pr   
   ctical-use-for-coffee-ground-waste   
      
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