Articulating the ineffable. Programming language theory 
cognitive psychology. PhD @Stanford
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this one took a good amount of research and spec digging, which I'm hoping is correlated with helpfulness! I love learning new things while writing an article.
A fun connection you may find interesting: resolving CSS properties to rules follows a similar structure to resolving methods to classes. http://willcrichton.net/notes/specificity-programming-languages/ … For languages with multiple inheritance, the resolution process can be similarly complicated as CSS
