In this June 10, 2013 photo released by Jon Shenk, a Google balloon sails through the air with the Southern Alps mountains in the background, in Tekapo, New Zealand. Google is testing the balloons which sail in the stratosphere and beam the Internet to Earth. (AP Photo/Jon Shenk) EDITORIAL USE ONLY

It's two-and-a-half years since Google first shared details of Project Loon, a series of high-altitude balloons designed to provide wireless Internet access to developing countries where infrastructure is scarce. As testing expands, and we've learned more about the project's progress, the FCC has started to receive objections from those concerned that the long-range microwave transmissions might pose health risks or interfere with other wireless operations.

Google has this week written to the FCC to argue that the balloons are both safe and legal ...

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