Hacker News on 8 September 2019

• Vinyl set to outsell CDs for first time since 1986
• A Technology Freelancer's Guide to Starting a Worker Cooperative [pdf]
• Is there a regular expression to detect a valid regular expression?
• Tiler: Build Images with Images
• The Riemann Hypothesis
• Ask HN: What are your favorite books or essays written at least 100 years ago?
• Wunderlist founder wants to buy his app back from Microsoft
• Philosophy of Computer Science [pdf]
• Tesla battery researcher unveils new cell that could last 1M miles
• Ask HN: What Have You Learned at Google as a Software Engineer?