User talk:2001:8004:1500:41AF:55D5:5B66:3194:33FB

July 2021
Hello, I'm DVdm. An edit that you recently made to Conservation of mass seemed to be a test and has been reverted. If you want to practice editing, please use the sandbox. If you think a mistake was made, or if you have any questions, you can leave me a message on my talk page. Thanks! - DVdm (talk) 09:05, 16 July 2021 (UTC)