Hacker News on 23 February 2020

• Mathematics for the Adventurous Self-Learner
• Guide to running Elasticsearch in production
• Show HN: Search code in GitHub repos using regular expressions
• Haven: turn old Android phones into security cameras
• Inrupt, Tim Berners-Lee's Solid, and Me
• Routed Gothic Font
• The Zen of Go
• Past Time to Tell the Public:It Will Probably Go Pandemic, We Should Prepare Now
• Should you self-host Google Fonts?
• Spain builds submarine 70 tons too heavy due to wrong decimal (2013)