Most countries in the world are “really metric countries”. And yes we do use the cm a lot for measurements inside the 1-100cm range.

How is this magic technology going to be freely implemented eveywhere and especially in the poorest parts of the world? You description of the mechanisms of invention and investing does not sound at all like how these things actually works in the world we are living in.

Some parts of the globe is going to run out of water, some areas of the globe are about to get way too much of it. You know, climate change and all that.