Hacker News stories for 11 AM on Tuesday Feb 19, 2013

0.402 Cohort analysis - User retention in a Rails application comments

0.292 StackMob Courts The Enterprise With Launch Of New Marketplace comments

0.053 Apple hit by hackers who targeted Facebook last week comments

0.050 Missing bitcoins on Coinbase comments

0.032 Like a Swarm of Lethal Bugs: The Most Terrifying Drone Video Yet comments