User talk:Poe323

May 2017
Hello, I'm Materialscientist. I noticed that you made a change to an article, Free-space optical communication, but you didn't provide a source. I’ve removed it for now, but if you’d like to include a citation to a reliable source and re-add it, please do so! If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks. Materialscientist (talk) 10:14, 3 May 2017 (UTC)