Hacker News on 12 June 2015

• Snowden Document Search
• Let's Encrypt Overview
• 1980s computer controls Grand Rapids Public School heat and AC
• Inverting Binary Trees Considered Harmful
• NixOS Linux
• PurifyCSS – Remove unused CSS
• Show HN: Retroospect – How was your work week?
• “An ISP in Asia is leaking routes to a Tier 1 transit provider”
• European Parliament TTIP vote postponed ‘because of huge public pressure’
• Financial Indicators for Startups at Different Stages