Our refrigerator. It is big and things easily go bad if we don't periodically go through and do an "inventory" of what's there, what needs to be eaten.

A fridge should, ideally: Track counts of objects, Have date of entry of objects, Have a freshness meter for all objects, and give me a map of the location of each object.

I have in mind how to visually display this info and have R&D insights to other ways to make this practical. Lots of innovation :)