Hacker News on 21 December 2019

• Fast
• The Deep Sea
• Go + Services = One Goliath Project
• U.S. Navy bans TikTok from government-issued mobile devices
• Monica: Open-source personal CRM
• Scaling Etsy
• Free and Open-Source Mathematics Textbooks
• Alan Kay: Smalltalk is not about objects, it’s about messaging (1998)
• ACM signed letter opposing open access
• Coolest Things I Learned in 2019