> with just a simple piece of paper an a $14k sound analysis / SDR / magnetism detection rig, we can detect force on the paper This is actually better than tha

> with just a simple piece of paper an a $14k sound analysis / SDR / magnetism detection rig, we can detect force on the paper This is actually better than that. They created a spray on invisible circuit board that can both detect touch inputs and generate enough electricity to power a bluetooth radio. They achieved all this for a unit cost of 25 cents. That's a pretty amazing achievement and opens up some quite practical uses. Imagine something like Nintendo Labo, but with so many more opportunities for interactivity. Another idea, imagine a student's notebook that synchronized their writing with their phone.