Hacker News on 21 April 2015

• Call Me Maybe: MongoDB Stale Reads
• We Can’t Let John Deere Destroy the Idea of Ownership
• Elevator.js
• NASA data API
• C-51 will undermine Canada’s businesses: Open letter from 60 business leaders
• This man just claimed a new European nation. 160,000 people want to live there
• Automate the Boring Stuff with Python
• Keywhiz: Square's system for distributing and managing secrets
• If 1+x is 1, how much is 1-x?
• Supreme Court Rules Extending Traffic Stop for Dog Sniff Unconstitutional [pdf]