User talk:49.149.172.91

July 2019
Hello, I'm William Avery. I wanted to let you know that one or more of your recent contributions to Louis de Broglie 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. William Avery (talk) 08:30, 17 July 2019 (UTC)
 * If this is a shared IP address, and you did not make the edits referred to above, consider creating an account for yourself or logging in with an existing account so that you can avoid further irrelevant notices.