February 2017 change
Please do not remove content from pages on Wikipedia, as you did to "Public speaking", without giving a good reason in the change summary. This is vandalism. If you want to practice changing Wikipedia, please use the sandbox. Thank you. J991 16:59, 16 February 2017 (UTC)
January 2018 change
Welcome to Wikipedia. Everyone is welcome to make helpful changes to Wikipedia. However, some of your changes, like those to "Renewable resource", did not seem to be helpful and have been reverted or removed. If you want to try out changing Wikipedia to learn more about how it works, please use the sandbox. Thank you. J991 16:36, 16 January 2018 (UTC)
June 2018 change
Welcome to Wikipedia. Everyone is welcome to make helpful changes to Wikipedia. However, some of your changes, like those to "Cell differentiation", did not seem to be helpful and have been reverted or removed. If you want to try out changing Wikipedia to learn more about how it works, please use the sandbox. Thank you. BRP ever 14:07, 12 June 2018 (UTC)
- If this is a shared IP address, and you didn't make the change, consider creating an account so you can avoid notices that are not for you.
April 2019 change
Welcome to Wikipedia. Everyone is welcome to make useful changes to Wikipedia. However, at least one of your changes, such as the one you made to "Alfred Wegener", did not seem to be helpful and has been automatically reverted by ChenzwBot. If you want to try out changing Wikipedia to learn more about how it works, please use the sandbox. Thank you.
- Technical details: Edit (6498588) processed with score of 0.98667.
If you believe there has been a mistake, please report it here and then remove this warning. --ChenzwBot (talk • contribs) 14:42, 10 April 2019 (UTC)
Please do not make unhelpful changes to Wikipedia, like you did to Martin Frobisher. The changes you made seem to be vandalism and have been automatically reverted. If you want to try changing Wikipedia to learn more about how it works, please use the sandbox.
- Technical details: Edit (6498675) processed with score of 0.98267.
If you believe there has been a mistake, please report it here and then remove this warning. --ChenzwBot (talk • contribs) 15:54, 10 April 2019 (UTC)
 | This is the discussion page for a person who has not created an account yet, or who does not use it. We have to use the numerical IP address to identify them. An IP address can be shared by many people. If you feel that things said here are not about you, you can create an account or log in to stop it happening again. |