I didn't realize how many years I'd been looking for a serious, entertaining, well-written leftist perspective on news and the world until I ran across this magazine.

http://slatestarcodex.com/2014/07/30/meditations-on-moloch/

It's what finally pushed me out of libertarianism after it was straining under my increasingly long list of qualifiers. He has a bunch of other great articles too ranging from ADHD to bayesian analysis.

Amazing essays on rationality, psychology, science, all sorts of stuff.

https://waitbutwhy.com

Simple but deep explanations of technology(his Elon Musk series is a must read)

Humanities & literature: https://www.aldaily.com/