Hacker News on 27 September 2012

• Announcing the First Beta Release of Persona
• StarCraft: Orcs in space go down in flames
• NASA Rover Finds Old Streambed on Martian Surface
• Beta Late Than Never (Steam Linux Beta)
• How to build a windmill
• “iCloud Backup”
• What happens to our brains when we exercise and how it makes us happier
• How a random bug in Deep Blue may ultimately have led to Kasparov's defeat
• Did NSA Put a Secret Backdoor in New Encryption Standard? (2007)
• Linux TCP/IP Tuning