Had an idea for an invention:

Household appliance that crushes shellfish shells, meat bones, etc. into a powder that you could use either as a supplement, to put in pet food or just as part of compost for a garden.

Also, the reason the trash sometimes stinks and is disgusting is because meat and seafood scraps are mixed with other disposable items. It would largely solve that problem too. And people would cook more, especially fish if they didn’t have to deal with disposing of the bones/shells.

(Now, hopefully no one will use this to dispose of his spouse.)

I would buy one of these appliances, biggest challenge would be to make the noise tolerable.

Other invention I’m trying to get my friend who make furniture to build: elegant wooden Faraday cage box for cellphone charging with a built-in contact charger on its floor. You drop your phone in the box when you get in the door, pick it up, fully charged on the way out.