User talk:2600:6C40:5F00:1603:45E6:A80:3E30:EB0E

September 2022
Hello, I'm Dr Greg. I noticed that you added or changed content in an article, Mass–energy equivalence, 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.  Dr Greg  talk 00:07, 29 September 2022 (UTC)