User talk:78.148.7.83

September 2019
Please refrain from making unconstructive edits to Wikipedia, as you did at Mass–energy equivalence. Your edits appear to constitute vandalism and have been reverted. If you would like to experiment, please use the sandbox. Repeated vandalism may result in the loss of editing privileges. Thank you. Toddst1 (talk) 19:01, 29 September 2019 (UTC)
 * If this is a shared IP address, and you did not make the edits referred to above, consider creating an account for yourself or logging in with an existing account so that you can avoid further irrelevant notices.