Hacker News on 21 February 2020

• More bosses give four-day workweek a try
• Which of these Amazon Prime purchases are real?
• How to Write Usefully
• Radical hydrogen-boron reactor leapfrogs current nuclear fusion tech?
• Amazon let a fraudster keep my Sony A74 IV and refunded him
• Discord is not an acceptable choice for free software projects
• Scientists use ML to find an antibiotic able to kill superbugs in mice
• Gilbert Strang Teaches Linear Algebra
• Follow-up to “The dystopian world of software engineering interviews”
• Single-payer healthcare would save $450B and 68k lives a year: study