About 40 years ago, Eric Drexler conceived of universal assemblers - machines that would be able to construct any desired material, simply by attaching the relevant atoms to each other to create the final structure. Machines like that could conceivably produce meat, hammers, glass, diamond, and even sophisticated electronics.
What if we had a competition to do just that? Not an actual universal assembler, but maybe a 3D printer that can create three different types of matter: metal tools, meat, and glass, for example.
What do you think?