User talk:173.48.197.239

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December 2013[edit]

Information icon 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 Newton's law of universal gravitation, 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) 02:21, 30 December 2013 (UTC)