The Mind once stretched never returns to its former shape. If you want to learn, while being entertained, and stretch your mind in new (and often productive) directions, below are my (thirteen) favourite article writers on mathematics, science, technology, programming, management, & business development. Feel free to add yours in the comments. (Note - the headlined quote is a paraphrase of a quote by Emerson.)

#1. DZO - Doron Zeilberger's Opinions - http://sites.math.rutgers.edu/~zeilberg/OPINIONS.html

#2. JoS - Joel on Software - Joel Spolsky - https://www.joelonsoftware.com/

#3. PG - Paul Graham - Essays - http://paulgraham.com/articles.html

#4. GK - Glenn Kelman - https://www.linkedin.com/influencer/5434591-Glenn-Kelman

#5. YK - Yosef Kreinin - Proper Fixationhttp://yosefk.com/blog/

#6. Coppelia (formerly Drunks & Lampposts - Simon Raper & friends - http://www.coppelia.io/blog/

#7. RJH - Rob J. Hyndman - Hyndsight - https://robjhyndman.com/hyndsight

#8. TT - Terence Tao - https://plus.google.com/+TerenceTao27/

#9. JDC - John D. Cook - https://www.johndcook.com/blog/

#10. JH - James Hague - Programming in the 21st Century - http://prog21.dadgum.com/

#11. SY - Steve Yegge - http://steve-yegge.blogspot.co.uk/

#12. LW - Larry Wasserman - Normal Deviate - https://normaldeviate.wordpress.com/2013/12/16/the-end/

#13. Peter Woit - Not Even Wrong - http://www.math.columbia.edu/~woit/wordpress/