Hacker News on 29 April 2019

• Ask HN: Are you put off building something because it already exists?
• Topics in Advanced Data Structures [pdf]
• SpaceX Gets FCC Approval to Sell Wireless High-Speed Home Internet from Space
• Belgian programmer solves MIT’s 20-year-old time capsule cryptographic puzzle
• I Can’t Answer Standardized Test Questions About My Own Poems (2017)
• Ask HN: How do you stay disciplined in the long run?
• Apache Software Foundation joins GitHub open source community
• Jenkins Is Getting Old
• WeWork Files for IPO
• Unauthorized access to Docker Hub database