User talk:Khartwel

Please do not add or change content without citing verifiable and reliable sources, as you did to Photovoltaics. Before making any potentially controversial edits, it is recommended that you discuss them first on the article's talk page. Please review the guidelines at Citing sources and take this opportunity to add references to the article. Thank you. Materialscientist (talk) 03:10, 5 December 2010 (UTC)