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First off, big fan of the site, been reading for years now.
Second - spend some time on the typography. Looking at your code, seems like you're running with a font size of .68em, with default line-height.
I'd recommend a font-size of at least .8em, with a line-height of maybe 1.2em. Whatever bumps it just a bit over default.
Also, consider making the width of your article pages narrower. Optimal line-length for reading is about 50 characters. It's better to have narrow columns and lots of scrolling, than a wide column that requires no scrolling. Check the New York Times website for a good example of web type, nice big fonts, and not too wide.
Keep up the good work!