Best Nonfiction Writing on Less Wrong

How­ever use­ful the con­tent, what are some ex­am­ples of the best non­fic­tion writ­ing on Less Wrong? Are there pieces you think are as good as re­cent clas­sics of es­say form like I Think You’re Fat or Lies We Tell Kids? For ex­am­ple, I like Yvain’s The Apol­o­gist and the Revolu­tion­ary.

Which pieces would you nom­i­nate as some of the best non­fic­tion writ­ing on Less Wrong?