User talk:Mehdi Hassan

May 2013
Hello, I'm Demiurge1000. I noticed that you recently removed some content from Lens (optics) without explaining why. In the future, it would be helpful to others if you described your changes to Wikipedia with an edit summary. If this was a mistake, don't worry: I restored the removed content. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks! --Demiurge1000 (talk) 20:41, 26 May 2013 (UTC)