Science:
4 gravitons
In the Pipeline
nanoscale views
Quanta Magazine
Shtetl-Optimized
News and politics:
Jamelle Bouie
Matt Bruenig (also writes NLRB Edge)
Crooked Timber
Jerusalem Demsas
Jay Caspian Kang
Eric Levitz
Money Stuff
Primary School
Split Ticket
Miscellaneous blogs:
Ask a Fuck Up
Citation Needed
Slate Star Codex (now at ACX)
Thing of Things
Podcasts and YouTube:
3Blue1Brown
ContraPoints
If Books Could Kill
Know Your Enemy