Hacker News stories for 1 PM on Thursday Apr 18, 2013

0.830 “‘Principal Component Analysis’ is a dimensionally invalid method” comments

0.540 Google Trends: Javascript Frameworks comments

0.453 Japan’s National Police Agency to urge Internet providers to block users of Tor comments

0.192 Don’t send me a message to tell me I have a message comments

0.191 How a Fake Island Landed on Google Earth comments