Hacker News stories for 6 PM on Tuesday Oct 16, 2012

0.710 Understanding Postgres Concurrency with MVCC comments

0.516 Dart is ready for the real world comments

0.380 Responsive design sketch sheets from ZURB comments

0.373 Announcing the Juju Web UI comments

0.348 are like Facebook comments

0.242 Data Mining 3.4 billion Web pages for $100 of EC2 comments

0.034 Icon fonts and their usefulness in iOS development comments