Hacker News on 4 July 2016

• Bulgaria Passes a Law Requiring Open Source
• No grades, no timetable: Berlin school turns teaching upside down
• Felony – An open-source PGP keychain
• fMRI software bugs could upend years of research
• Ask HN: What did your 'Show HN' project turn into?
• Ruma, a Matrix homeserver written in Rust
• Show HN: OpenGL in super slow motion – visualising Z-buffering
• ABI vs. API (2004)
• Fatigue Is a Brain-Derived Emotion that Regulates to Ensure Protection (2012)
• Amazon Is Quietly Eliminating List Prices