User talk:Duikbootman

Reliable sources
Hello, I'm DVdm. I noticed that you made a change to the articles Time dilation and Length contraction, but you didn't provide a reliable source. It's been removed for now, but if you'd like to include a reliable citation 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. Thank you. - DVdm (talk) 20:48, 19 February 2013 (UTC)