User talk:197.239.7.181

September 2022
Hello, I'm Dr Greg. An edit that you recently made to Speed of sound 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!  Dr Greg  talk 16:09, 27 September 2022 (UTC)