User talk:Sir2sirjohn

October 2013
Hello, I'm Mark Arsten. I wanted to let you know that I undid one of your recent contributions, such as the one you made with this edit to Calculus, because it didn’t appear constructive to me. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks. Mark Arsten (talk) 00:57, 8 October 2013 (UTC)