Ask HN: Recommended blogs by smart people you read?

I've asked this before but like to do it periodically as new people may answer.

What are some blogs by really smart people you read?

Ideally the less well known/obvious the better.

I think blogs can be a really good source of insight because they give you access to less known and less commoditized knowledge.

So what are your recommendations?

Doesn't have to be restricted to any topic necessarily, some categories come to mind such as science, business, philosophy, art, culture, or whatever you're interested in.

Looking forward to answers!