One of those, "If cars can fly we wouldn't need to build any more roads!" concepts. I got to learn a bit about betavoltaic[1,2] devices which seem pretty neat,

One of those, "If cars can fly we wouldn't need to build any more roads!" concepts. I got to learn a bit about betavoltaic[1,2] devices which seem pretty neat, but I'm not going to hold my breath on seeing production versions any time soon :-). [1] https://en.wikipedia.org/wiki/Betavoltaic_device https://en.wikipedia.org/wiki/Betavoltaic_device [2] "Advances in Betavoltaic Power Sources" -- https://pdfs.semanticscholar.org/795d/eb5ca274f79a11730b9a34e78633f3dfe781.pdf https://pdfs.semanticscholar.org/795d/eb5ca274f79a11730b9a34...