A years old post with interesting comments on how it works: https://news.ycombinator.com/item?id=3514721
Similar very old discusión, the website is dead, but there are a few nice comments in HN https://news.ycombinator.com/item?id=3514721
A years old post with interesting comments on how it works: https://news.ycombinator.com/item?id=3514721