3D PRINTING of heart valves and bionic ears, using a hydrogel assembly frame that then gets populated with aortic or cochlear cells after incubation with a brew of pure cells. Chuck Hull invented stereolithography with his 1986 patent, while working for 3D Systems in California (famously described as “any system capable of solidification”). But like the inventors of the internet in 1989 (who? Sir Tim Bergers-Lee, now an MIT Professor). these are curiously not household names but should be. Clearly two immense inventions that have changed, and are continuing to change, our world.