Hacker News on 2 December 2014

• NASA: We're sending humans to Mars
• Nature makes all articles free to view
• 24/192 music downloads are silly
• Gangnam Style breaks YouTube viewer count
• Immigration is about talent, not costs
• Composer – Disable GC when computing deps and refs
• AWS CodeCommit
• PostgreSQL’s New LATERAL Join Type
• Once Celebrated in Russia, Programmer Pavel Durov Chooses Exile
• Stripe raises $70M at $3.5B valuation, double that of January