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On my iPad all the letter 'D's have disappeared. It's quite disconcerting.

Same on my iPhone, all the 'd' characters don't show up properly at all. Had to read the article zoomed right up so that the spider thin d characters were visible at all. Please change the font.

I was wondering the same. Waiting for Browsershots to render the page in different browsers:

http://browsershots.org/http://helios.io/

Looks great in Mac OS.

In my experience, the issues w/ thin font weights tend to be worse on Windows & Linux. Worth keeping in mind if you're using these fonts (particularly if you're using some of the free fonts from Google Web Fonts that aren't necessarily well-hinted)

Here's firefox on linux. http://imgur.com/YqtBUR4 You might want to change the hinting on your fonts. I've set it to "slight".

Looks like your browser isn't properly doing sub-pixel anti-aliasing.