User talk:189.216.156.101

Please refrain from making unconstructive edits to Wikipedia, as you did at Conservation of mass. 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. Gatemansgc (TɅ̊LK) 23:44, 12 August 2020 (UTC)