User talk:2600:387:0:809:0:0:0:5A

November 2017
Hello, I'm Jim1138. I wanted to let you know that I reverted one of your recent contributions —the one you made with this edit to Internal energy— because it did not appear constructive. If you would like to experiment, please use the sandbox. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks. Jim1138 (talk) 03:30, 3 November 2017 (UTC)

Hello, I'm Fin 22. I wanted to let you know that one or more of your recent contributions have been undone because they 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. Fin (talk) 02:46, 18 October 2019 (UTC)