Comment by stared

Frequently:

http://www.economist.com/ - my second best feed (after HN)

Occasionally:

http://www.datatau.com/ - HN for data science

https://johncarlosbaez.wordpress.com/ - Mathematics, Theoretical Physics

https://terrytao.wordpress.com/ - Mathematics

http://slatestarcodex.com/ - Less Wrong-kind stuff (the guy writes frequent and well, but somehow too verbosely)

http://visualizing.org/ - data visualizations

A bit of G+ (mainly, if not only, for a few guys in mathematics and physics).