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Welcome to the "Silicon Roundabout," which is luring young companies with government funding, Google-sponsored office space, and a new start-up competition. The start-up scene in London may not be as well known as the hotbeds of entrepreneurship in Silicon Valley or New York City, but it is striving to offer entrepreneurs looking to launch companies a buzzing business environment.

Promising treatments for those blinded by an often-hereditary, retina-damaging disease are expanding throughout Europe and making their way across the pond, offering a ray of hope for the hundreds of thousands of people in the U.S. left in the dark by retinitis pigmentosa . The disease--which affects about one in 4,000 people in the U.S