My comment got deleted in the topic Aspiring scientist. It got deleted - fine. But I don't see who did it? Is it normal here, is it norm? I would like to be aware of moderators who do that without leaving a comment.
Comments are ephermal, in general they can be deleted without explanation.
In this case, the link was possibly non mainstrean and had been flagged (we disallow non mainstream physics here), and besides it had no potential of improving the post.
Please only use comments to point out mistakes, ask for clarification, or suggest improvements.