Google's Balloon-Powered Internet Project
Google is cooking up Project Loon, bringing internet access to rural areas using high-altitude balloons. And that altitude is super high -- the balloons float in the stratosphere, beaming a sort of cellular-style signal back to terrestrial antennas. Using solar power arrays, the balloons can drift up and down into existing air currents, allowing them to travel without side-to-side propulsion. Pretty neat!