It's always interesting to hear of new growing mediums for mushrooms.
The latest new idea emanating from Mexico is the growing of mushrooms on pre-used disposable diapers. Sounds kind of yucky, but the science behind the method seems solid.
Mexico is the third largest consumer of disposable diapers globally. You can see how the idea arose.
It does show how some creative thinking can come up with solutions for a more environmentally friendly method of nappy disposal.