Hacker News on 3 May 2019

• Common mistakes in PostgreSQL
• I/O Is Faster Than CPU – Let’s Partition Resources and Eliminate OS Abstractions [pdf]
• Amazon S3 will no longer support path-style API requests
• The Rate of Return on Everything, 1870–2015 [pdf]
• Pornhub wants to buy Tumblr
• Huge study finds drugs stop HIV transmission
• A New Way of Voting That Makes Zealotry Expensive
• Paying for Open Source Contributions
• America’s Oldest Gun Maker Went Bankrupt: A Financial Engineering Mystery
• Ask HN: How can I automatically scan and catalog a mountain of books?