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  1. 01Breakscale's Retry Storm example: a top bar reading 100 requests per second offered, goodput 0/s, errors 100% and 118/s dropped, a canvas with Client → API Server → Database boxes showing the database 99.9% busy, and a handwritten-style explanation below

    Breakscale

    System-design simulator for learners

    Browser system-design simulator: build a topology, load it until it breaks, see why

    Use in the browser
    ★ 1.2k
    BACK CATALOGEDUCATION · GitHub · MIT · kept 2026.09.14
  2. 02Solar Wanderer: Earth seen from the Moon's surface, with the Moon info panel (Chinese UI)

    Solar Wanderer

    Real-time 1:1 solar system, no install

    1:1 real-time solar system in the browser, driven by NASA JPL ephemerides; phone-friendly

    Use in the browser
    ★ 739
    BACK CATALOGEDUCATION · GitHub · MIT · kept 2026.09.14
  3. 03Programming Museum playground page: 'The Children's Playground' heading on black, a number-guessing game below.

    Programming Museum

    EDUCATION

    Hangs real, runnable source code in frames you walk past room by room.

    Use in the browser
    ▲ 5 HN
    NEW 0h OLD WHEN SEENEDUCATION · Show HN · kept 2026.09.14