Though artificial-joint tech is pretty advanced these days, with titanium hips and knees built to last a decade or more, they won't last forever -- and aging patients will have to go back under the knife for upgrades. Naturally re-growing their own bones would be a nice alternative.
For the first time, researchers have proven this can work, by stimulating the body's own stem cells to re-grow joint tissue around an implantable scaffold.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.