User talk:Carl12345mn

November 2016
Hello, I'm Contributor321. I wanted to let you know that one or more of your recent contributions to Steven G. Poskanzer have been undone because they did not appear constructive. If you would like to experiment, please use the sandbox. If you think a mistake was made, or if you have any questions, you can leave me a message on my talk page. Thanks. Contributor321 (talk) 20:29, 23 November 2016 (UTC)

Please do not introduce incorrect information into articles, as you did to Columbia University. Your edits could be interpreted as vandalism and have been reverted. If you believe the information you added was correct, please cite references or sources or discuss the changes on the article's talk page before making them again. If you would like to experiment, use the sandbox. Thank you. Semmendinger (talk) 01:24, 24 November 2016 (UTC)

February 2017
Please stop your disruptive editing. If you continue to vandalize Wikipedia, as you did at Steven G. Poskanzer, you may be blocked from editing. Contributor321 (talk) 18:41, 20 February 2017 (UTC)