Are there any sites like Lemmy or Reddit that are more intellectual with no memes and no downvoting?

Looking for something like Hacker News but not about tech or programming.

Looking for something where people post or comment about Science, Physics, philosophical things, Simulation Theory, the Multiverse, or crazy "what if" hypotheticals.

Looking for the format of Reddit or Lemmy but with out all the negative comments and downvoting.

Are there any sites like that?