User talk:Gen2013Gen

Please do not add or change content without verifying it by citing a reliable source. Please review the guidelines at Citing sources and take this opportunity to add references to the article. Thank you. Materialscientist (talk) 05:44, 28 February 2013 (UTC)

Please stop adding unsourced content. This contravenes Wikipedia's policy on verifiability. If you continue to do so, you may be blocked from editing Wikipedia. Materialscientist (talk) 05:49, 28 February 2013 (UTC)