In pictures: 11 eye-catching solar tech projects

From the world's largest solar furnace to a still that turns salt water into drinking water, the range of devices that harness the sun's energy is breathtaking. Here are some of our favourites

Making hay while the sun shines With more energy from the sun reaching Earth in an hour than we humans use in a year, it's no wonder that people have come up with myriad ways to use that power -- including a recent project announced by Google X for using solar-powered balloons to bring Internet access around the world.

Here are 11 other solar projects that are either in use today or in development. Some have humanitarian aims, such as a solar-powered toilet and waste treatment system meant for areas of the world that lack adequate sanitary facilities. Others, like a racecar powered by 2,000 solar cells, are just plain cool. All will make you sit up and take notice.

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