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1. Mathematics for the Adventurous Self-Learner (neilwithdata.com) 1177 points by nsainsbury 2 days ago | 42 comments 2. “We found PayPal vulnerabilities and PayPal punished us for it” (cybernews.com) 968 points by teslademigod1 1 day ago | 35 comments 3. More bosses give four-day workweek a try (npr.org) 929 points by hhs 4 days ago | 64 comments 4. Explorabl.es (explorabl.es) 874 points by rickdeveloper 6 days ago | 16 comments 5. Which of these Amazon Prime purchases are real? (thewirecutter.com) 839 points by zdw 4 days ago | 55 comments 6. How to Write Usefully (paulgraham.com) 811 points by r_singh 4 days ago | 67 comments 7. Radical hydrogen-boron reactor leapfrogs current nuclear fusion tech? (newatlas.com) 757 points by chris_overseas 4 days ago | 45 comments 8. Real-time, in-camera background compositing in The Mandalorian (ascmag.com) 756 points by ashin 5 days ago | 28 comments 9. Amazon let a fraudster keep my Sony A74 IV and refunded him (petapixel.com) 730 points by ProAm 4 days ago | 38 comments 10. Cloudflare silently deleted my DNS records (txti.es) 687 points by iudqnolq 1 day ago | 49 comments 11. Bert Sutherland Has Died (en.wikipedia.org) 677 points by dang 6 days ago | 12 comments 12. Guide to running Elasticsearch in production (facinating.tech) 673 points by thunderbong 2 days ago | 25 comments 13. Andreessen-Horowitz craps on “AI” startups from a great height (scottlocklin.wordpress.com) 667 points by dostoevsky 1 day ago | 43 comments 14. Suspicious Discontinuities (danluu.com) 638 points by janvdberg 5 days ago | 27 comments 15. Almost everything on computers is perceptually slower than it was in 1983 (2017) (twitter.com) 598 points by LinuxBender 6 days ago | 77 comments 16. Donald Knuth was framed (buttondown.email) 597 points by akalin 1 day ago | 31 comments 17. Show HN: Search code in GitHub repos using regular expressions (grep.app) 594 points by danfox 2 days ago | 49 comments 18. Why SQLite succeeded as a database (2016) (changelog.com) 583 points by Tomte 6 days ago | 33 comments 19. Discord is not an acceptable choice for free software projects (sneak.berlin) 529 points by rauhl 4 days ago | 50 comments 20. Katherine Johnson, NASA mathematician, has died at 101 (nytimes.com) 522 points by uptown 1 day ago | 14 comments 21. Hackers Were Inside Citrix for Five Months (krebsonsecurity.com) 519 points by feross 6 days ago | 21 comments 22. Does memory leak? (1995) (groups.google.com) 499 points by rot25 3 days ago | 33 comments 23. EU Commission to staff: Switch to Signal messaging app (politico.eu) 489 points by maxbaines 1 day ago | 28 comments 24. Guide to Equity Compensation (holloway.com) 481 points by DyslexicAtheist 5 days ago | 28 comments 25. DigitalOcean raises $100M in debt as it scales toward revenue of $300M (techcrunch.com) 476 points by drchiu 5 days ago | 23 comments 26. Stop Using Encrypted Email (latacora.micro.blog) 471 points by lvh 6 days ago | 70 comments 27. Let's Encrypt has turned on stricter validation requirements (community.letsencrypt.org) 468 points by mmoez 6 days ago | 14 comments 28. Google interviewing process for software developer role in 2020 (habr.com) 458 points by atomlib 1 day ago | 65 comments 29. We use Kubernetes and spot instances to reduce EC2 billing up to 80% (tuananh.net) 456 points by talonx 21 hours ago | 27 comments 30. Mozilla’s DNS over HTTPs (blog.mozilla.org) 438 points by Vinnl 12 hours ago | 71 comments More

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