User talk:172.56.11.151

Recent edit to Muhammad al-Mahdi
Hello, and welcome to Wikipedia. I noticed that you made a change to an article, Muhammad al-Mahdi, but you didn't provide a reliable source. It's been removed for now, but if you'd like to include a citation and re-add it, please do so! If you need guidance on referencing, please see the referencing for beginners tutorial, or if you think I made a mistake, you can leave me a message on my talk page. Thank you! Materialscientist (talk) 11:44, 7 March 2017 (UTC)

April 2020
Hello, I'm Materialscientist. I wanted to let you know that I reverted one of your recent contributions —specifically this edit to Slavery in China—because it did not appear constructive. If you would like to experiment, please use the sandbox. If you have any questions, you can ask for assistance at the Help desk. Thanks. Materialscientist (talk) 02:48, 23 April 2020 (UTC)
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