Incorrect display of fonts on Windows 8 (tested Firefox and Chrome)

Normal weight looks a bit unpleasing when viewed on Firefox 25 and Chrome 30 (Windows 8). Maybe it's better to use Light weight for body instead?

![comparison of regular and light weights of source sans pro](https://f.cloud.github.com/assets/389387/1681229/62eefaf0-5d8f-11e3-8aa5-a70210b8f6b3.png)
(make sure to open above image in separate tab/window, downscaling somewhat hinders the quality)

Also, maybe it's wise to look into typefaces from the [League of Movable Type](https://www.theleagueofmoveabletype.com/) for headings to introduce some contrast? All their fonts are open-sourced, they have [repository on GitHub](https://github.com/theleagueof).