Grow mushrooms on old Digi-Key catalogs via BB.
Making DIY gourmet mushrooms at home is difficult: you must buy a bale of hay, and must innoculate some sterile grain as “spawn.” That, or buy a pre-made “grow block” from a supplier. Instead, what if we use old phone books as the growth medium? Don’t throw out those Mouser and Digikey electronics catalogs, instead turn them into mushrooms. Pleurotus ostreatus (oyster mushrooms) is an easy one.