What's with the font?
Using a standard, A/B test verified, marketing approved font is a wasted opportunity. If you are going to do something, do it with personality. With this in mind, Biome is the font of this site.
You can read more about the font on fonts.com. In the words of the creator, Carl Crossgrove:
“Biome (bi as in binary + ome as in home)...climatically and geographically similar climatic conditions, such as communities of plants, animals and soil organisms – basically an ecosystem.”
Therefore, the answer to “What’s with the font?”: It is the only font that makes sense for this site.