I have a friend who's thinking about checking out the fediverse, and is looking for more aerospace (& maybe mechanical?) engineering-focused spaces. Do you guys have a suggested Lemmy, Piefed, or Mastodon instance/community that focuses on those topics? Maybe even a STEM community could be good enough. I know most of us are tech nerds on here, but we're more computer focused tech nerds 😅

My only requirement is that the instance can be viewed without sign-in, as I don't want to force them to make an account to check it out.