Respectfully, the letter spacing of your main font is so wide and the word spacing so comparatively narrow it's making for slow and difficult reading for me. I can see how you may be going for a kind of spacious theme for the look of the site, but there is probably a way to do it without impeding the visual flow of the text... None the less, I'm quite eager to get through this very interesting article, I'd just rathe…
I found that using webkit inspector to set the paragraph style to normal letter-spacing, 1.4em line-height helped the readability immensely. Something to consider, perhaps?