Like time and money, the space on the rooftops of public and commercial buildings is a finite resource. Now, a curvy, new solar cell offers building owners and contractors an opportunity to make the most of all three. The system consists of dozens of hermetically sealed glass tubes containing a cylindrical core of thin-film photovoltaic material arranged in a 3.5-ft x 5-ft rectangular aluminum framework to create panels specifically designed for optimal performance on low-slope rooftops. Photo: Solyndra Curved cells (above) allow for flexible rooftop installation. Related Links: America May Gain from Materials Designed To Stretch Your Stimulus Dollars Packing