User talk:47.197.74.168

October 2022
Hello, I'm DB1729. I wanted to let you know that I reverted one of your recent contributions—specifically this edit to Doppler effect—because it 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 Teahouse or the Help desk. Thanks. DB 1729 talk 02:40, 17 October 2022 (UTC)