User talk:Walrq1

April 2016
Hello, I'm Mike1901. I wanted to let you know that I reverted one of your recent contributions —the one you made with this edit to Doppler effect— because it didn’t appear constructive to me. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks. Mike1901 (talk) 20:09, 10 April 2016 (UTC)