User talk:175.139.68.18

April 2019
Please refrain from making unconstructive edits to Wikipedia, as you did at Timeline of scientific discoveries. 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. Dl2000 (talk) 21:32, 29 April 2019 (UTC)