Hacker News on 7 June 2015

• Chalkboard drawings frozen in time for 100 years discovered in Oklahoma school
• Paris Metro lines on a Git graph
• Pixel City – Procedurally generated city (2009) [video]
• How I killed app sales by going freemium
• TempleOS: FlightSim and FirstPersonShooter [video]
• Raw Linux Threads via System Calls
• Docker Jumpstart
• Unix is not an acceptable Unix
• Why Has Apple Spawned So Few Startups?
• Growing One's Consulting Business (2012)