DTF:HN for April 18, 2026

Your Daily Tech Feed covering the top 10 stories on Hacker News for April 18, 2026. Featuring: Category Theory Illustrated – Orders, Amiga Graphics, Michael Rabin Has Died, Claude Design, Show HN: I made a calculator that works over disjoint sets of intervals, and more. Stories covered: 1. Category Theory Illustrated – Orders https://abuseofnotation.github.io/category-theory-illustrated/04_order/ HN discussion: https://news.ycombinator.com/item?id=47813668 2. Amiga Graphics https://amiga.lychesis.net/ HN discussion: https://news.ycombinator.com/item?id=47813566 3. Michael Rabin Has Died https://en.wikipedia.org/wiki/Michael_O._Rabin HN discussion: https://news.ycombinator.com/item?id=47782925 4. Claude Design https://www.anthropic.com/news/claude-design-anthropic-labs HN discussion: https://news.ycombinator.com/item?id=47806725 5. Show HN: I made a calculator that works over disjoint sets of intervals https://victorpoughon.github.io/interval-calculator/ HN discussion: https://news.ycombinator.com/item?id=47812341 6. Measuring Claude 4.7's tokenizer costs https://www.claudecodecamp.com/p/i-measured-claude-4-7-s-new-tokenizer-here-s-what-it-costs-you HN discussion: https://news.ycombinator.com/item?id=47807006 7. Towards trust in Emacs https://eshelyaron.com/posts/2026-04-15-towards-trust-in-emacs.html HN discussion: https://news.ycombinator.com/item?id=47778938 8. All 12 moonwalkers had "lunar hay fever" from dust smelling like gunpowder (2018) https://www.esa.int/Science_Exploration/Human_and_Robotic_Exploration/The_toxic_side_of_the_Moon HN discussion: https://news.ycombinator.com/item?id=47808913 9. The simple geometry behind any road https://sandboxspirit.com/blog/simple-geometry-of-roads/ HN discussion: https://news.ycombinator.com/item?id=47788207 10. Spending 3 months coding by hand https://miguelconner.substack.com/p/im-coding-by-hand HN discussion: https://news.ycombinator.com/item?id=47807583