Hacker News on 21 May 2019

• I don't know how CPUs work so I simulated one in code
• Five Hundred and Seven Mechanical Movements
• A Solution for Loneliness: Get out and volunteer, research suggests
• Apple introduces 8-core MacBook Pro
• Technical Debt
• Free Wolfram Engine for Developers
• Procrastination is not a time management problem, it is an emotion
• Niki Lauda has died
• Firefox 67.0 Released
• Show HN: Turn an Excel file into a web application