The Toxoplasma of Rage: An essay about how more controversial examples tend to get elevated and thinking about why that happens. https://slatestarcodex.com/2014/12/17/the-toxoplasma-of-rage...
Meditations On Moloch: An essay about how incentives and coordination problems cause systemic societal issues: https://slatestarcodex.com/2014/07/30/meditations-on-moloch/
Who By Very Slow Decay: An essay about death in medicine. https://slatestarcodex.com/2013/07/17/who-by-very-slow-decay...
I Can Tolerate Anything Except The Outgroup: An essay about tribalism https://slatestarcodex.com/2014/09/30/i-can-tolerate-anythin...
He's a good writer, as other replies mention it came out of lesswrong (see: https://www.lesswrong.com/tag/sequences).
Some lesswrong favorites (mostly Eliezer Yudkowsky):
Policy Debates Should Not Appear One-Sided: https://www.lesswrong.com/posts/PeSzc9JTBxhaYRp9b/policy-deb...
A Fable of Science and Politics: https://www.lesswrong.com/posts/6hfGNLf4Hg5DXqJCF/a-fable-of...
Pretending to be Wise: https://www.lesswrong.com/posts/jeyvzALDbjdjjv5RW/pretending...
Local Validity as a Key to Sanity and Civilization: https://www.lesswrong.com/posts/WQFioaudEH8R7fyhm/local-vali...
The Bottom Line: https://www.lesswrong.com/posts/34XxbRFe54FycoCDw/the-bottom...
---
For a fun creative fiction one from Scott: https://slatestarcodex.com/2015/06/02/and-i-show-you-how-dee...
From EY: http://www.hpmor.com/