Recently, d&tm posted:

I like to lurk around the space groups and occaionally ask questions
and even dare to have the temerity to try to answer some of them.
Should I refrain from doing this because I am not an astronaut? or an
astrophysicist?

I would think it wise to refrain from arguing with astrophysicists or
astronauts about their responses to your posts. It would be considerate to
other readers not to pose as having the credentials of either of those
professions.

Neil