Grab some jars with lids that will seal tight. In each jar put a food that you want to observe.
Seal up the jars and place them somewhere where they won’t bother you. Being by a window will cause a lot of condensation in the jars due to the heat from the sun beating into the jars. This can make things mold quite a bit faster. You could try them in the dark if you want to prevent that. Or do both and compare!
Start with predictions, which rots the fastest, which will grow mold first, or last…
The worst part of the entire process is opening those jars when the project is done.
I warn you it is a disgusting science experiment.
The experiment was found at the blog TeachBesideMe