Hacker News on 15 January 2011

• Garry Tan moving on from Posterous and joining YC
• Why Minecraft Matters
• Top Mistakes in Behavior Change
• The Ambiguity of Open and H.264 vs. VP8
• DropQuest 2011
• Why pi?
• Roll your own toy UNIX-clone OS
• Fast Levenshtein distance using a Trie
• Paranoia and deletion: the wipe man page
• RAPT: A physics-intensive HTML5 Platformer