Quentin Declerck, from Le Champignon de Bruxelles, inspects the progress of shelves of mushrooms growing in various substrates at the company's urban farm in the cellars of Cureghem in Brussels, Wednesday, Feb. 5, 2020. When the founding members of the company first tried to grow their Shiitake, Maitake and Nameko mushroom varieties using coffee grounds as a substrate, they realized the fungi much preferred organic beer waste. (AP Photo/Virginia Mayo)
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