Hacker News on 18 June 2019

• Facebook reveals its cryptocurrency Libra
• Things I learnt the hard way in thirty years of software development
• Two potentially life-friendly planets found orbiting a nearby star
• How LinkedIn exfiltrates extension data from the browser
• $1B for 20,000 Bay Area homes
• Facebook Cryptocurrency Plan Faces Opposition in France
• Super Thinking: The Big Book of Mental Models
• Mezzano – An operating system written in Common Lisp
• Transforming a Tesla Model 3 into a Pickup Truck
• The worst morale-boosting gesture I've experienced