Packet switched pneumatic tubes. Back when pneumatic tubes were a big thing we didn't have a lot of the technology we have now. I think a lot of the inefficienc

Packet switched pneumatic tubes. Back when pneumatic tubes were a big thing we didn't have a lot of the technology we have now. I think a lot of the inefficiency in pneumatic tube networks could be made up for by modern computing and robotics. Obviously a lot of challenged but if you could get the downtown core of a high density city on board as a trial project you could be delivering everything from packages to fast food. It's an expensive piece of infrastructure to invest in, and I know big companies like Amazon are expecting drones to solve all their problems, but I can't help but think the answer is to just lay out some pipe and build the network. I think once you have a network like that it changes the economics of a lot of stuff. Maybe you can even use return packets for garbage collection. I think if you can get the per packet price low enough it opens the doors for a lot of new business ideas.