Hacker News on 17 April 2017

• Rope Science – Computer science concepts behind the Xi editor
• Brains Sweep Themselves Clean of Toxins During Sleep (2013)
• 90% of Python in 90 Minutes (2013)
• PHP 7 Virtual Machine
• MP3 for Image Compression (2006)
• Show HN: Zuck.js, a JavaScript library that lets you add Stories everywhere
• Loss of Coral Reefs Could Cost $1T
• How the Airlines Became Cartels
• Teeny Tiny Mansion: text adventure game formally proven to have no dead ends
• A document to help you start a tech cooperative