If you don't think it's safe to fly it over cities with 5 million+ people, then flying it over cities with 1 million is also not OK. FAA authorisation is mentioned multiple times but why doesn't this ...
The year is 1962, America has just sent an astronaut to space and an engineer with the name Buckminster Fuller has just patented the Tensile-Integrity Structure. He looks to the empty blue sky, its ...