Imagine a future in which entire cities are blanketed with blazing-fast wireless internet. If Google gets its way, that could one day be a reality. The search giant this week asked the FCC to keep mum about a recent application to test an experimental radio network at its Mountain View, Calif., headquarters. No one knows what exactly Google is testing (it could be new devices and hardware), but the frequencies tapped, reportedly between 2524 and 2625Mhz, would work well in densely populated areas, says The Wall Street Journal. In fact, mobile operators in China, Brazil, and Japan are already building networks around it. Google, to its credit, already offers free WiFi in the city of Mountain View, and is rolling out a similar service in New York's Chelsea neighborhood, where the company has an office. In Kansas City, the search giant has introduced a next-generation high-speed wired service for internet and video called Google Fiber. (Via The Wall Street Journal)