There are a couple of things I've been wondering about how the site works. I've been digging through the source code, but I've never learned to work with rails, and so it's not always clear how different parts of the codebase work together.

• How are featured articles chosen
• When does the featured article change? Sometimes, it seems to stay the same for a while, and sometimes it seems to change very quickly.
• How is the main feed generated that a user sees on the home page? Some articles seem to linger on the top of my feet for quite long.
• How often is new code deployed to production?