<http://schema.org/url>
<http://www.mnn.com/green-tech/research-innovations/stories/first-all-carbon-solar-cell-made-with-nanotubes-and-buckybal>
<http://www.mnn.com/green-tech/research-innovations/stories/first-all-carbon-solar-cell-made-with-nanotubes-and-buckybal>