Something that slices bread would be nice.

Antigravity device

A way to save and restore the climate and non-human habitats from industrial abuse and destruction, and reverse the extinction crisis. (Safe clean fusion power plants would help a bit.)

A way to get the people and organizations who have all the money and power, to put their effort and power into making the world better for everyone, rather than just increasing their own money and power at the expense of everyone else.

An effective privacy-protecting solution to all the privacy violations created by tracking, and making audio and visual recordings of everyone’s activities everywhere.

Zips that work smoothly, never fail and dont get caught in your private parts

Portal transportation devices to eliminate planes, trains, and automobiles.