Hacker News stories for 9 PM on Monday Apr 29, 2013

0.730 How to Measure Your Start-up’s Success comments

0.202 Robot Operating System Ros comments

0.188 One Year Later, the Results of Tor Books UK Going DRM-Free comments

0.182 Pentagon Paying China — Yes, China — To Carry Data comments

0.076 Turn a light bulb ON with every new user or download comments