In Julia's science study this year, she's instructed to find mushrooms and examine their spores under the microscope. There's no shortage of mushrooms in our neighbor's yard! He's never home. I think he stays on his fishing boat about 11 1/2 months of the year. So ... we use his yard as our doggies' potty stop. That's a bit embarrassing, so I whispered it. The result is, a banner crop of mushrooms!!
She was also supposed to grow some mold on food, so we did as the textbook said and placed some homemade jam, an apple slice, and some bread on a plate. I supplied a store-bought bread and a homemade, hoping that the homemade, without preservatives, would provide her with some nice mold sooner.
She informed me I should not eat any more of that dressing. It was "alive and wriggling," as Gollum would say.
I guess there's a limit to how much "live food" you should keep around the house, even if you are a green foodie type. But they sure are handy for science experiments!