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Google is taking to the air. The online giant has announced plans to test a network of stratosphere-wandering balloons intended to provide Internet access to the two-thirds of humanity who still can’t log on to the Web.

The solar-powered balloons transmit signals to each other high in the sky, signals which eventually find their way to a user’s “Internet antenna” on the Earth below. The balloons simply drift with the winds—algorithms help the balloons rise or fall into the wind pattern that will take them where they need to go.