User talk:67.247.13.141

May 2023
Hello, I'm Schminnte. I noticed that you added or changed content in an article, Conservation of energy, but you didn't provide a reliable source. It's been removed and archived in the page history for now, but if you'd like to include a citation and re-add it, please do so. You can have a look at referencing for beginners. If you think I made a mistake, you can leave me a message on my talk page. Thank you. Schminnte (talk • contribs) 11:22, 21 May 2023 (UTC)

June 2023
Please do not add or change content, as you did at Conservation of energy, without citing a reliable source. Please review the guidelines at Citing sources and take this opportunity to add references to the article. Thank you. Throast  { { ping }} me! (talk &#124; contribs) 20:21, 11 June 2023 (UTC)