Just about every American home has a collection of half-empty house paint cans lingering in its garage or basement. These remnants, often of noble experiments like brightening the bathroom with hot pink, are of no value to the current occupants. But how can they get rid of the aging paint? Most landfills in the United States do not accept liquids. And while many landfills will accept paint that has been turned into a solid (by mixing it with kitty litter, for example), the resulting cans of drie…

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