User talk:2603:7080:8140:169:78C8:31B9:AB0D:B817

November 2021
Hello, I'm Knuthove. I wanted to let you know that one or more of your recent contributions&#32;to Talk:Charles K. Kao have been undone because they did not appear constructive. If you would like to experiment, please use the sandbox. If you have any questions, you can ask for assistance at the Teahouse. Thanks. Knuthove (talk) 15:51, 11 November 2021 (UTC)