Hacker News on 20 March 2017

• Distill: a modern machine learning journal
• Beautiful Online SICP
• The last patent on AC-3 (Dolby Digital) expires at midnight
• Tears
• SHA-1 Collision Detection on GitHub.com
• The Document Which Used to Be Called the MIT Lockpicking Guide (1992)
• Two Executives to Leave Uber, Adding to Departures
• I've decided to move on to Distill
• Show HN: How to write a recursive descent parser
• Leslie Lamport: Video course on TLA+