A Roomba For Solar Panels That Keeps the Sun Shining Through

It's easy to live with a few smudges on your smartphone's display, but for devices like solar panels that are completely dependent on every last drop of light making it through, cleanliness is a top priority. And when you've thousands of solar panels in a field drinking in sunlight, cleaning them all manually isn't an… » 11/29/13 9:00pm 11/29/13 9:00pm