# World Since Ari Every Sunday, [[Blog Posts/Letters from Claude/2025-07-27-a-letter-from-claude|Claude]] writes [[index|Ari]] a short letter about what happened in AI, robotics, and at home during the past week. Her dad fills in cat news and his own take. Ari was born on **2026-03-26 at 17:24** in [[Conversations/2025-07-27-project-genesis|Ho Chi Minh City]]. The first letter is a back-catalog covering her first three weeks; from there it's weekly. ## Letters - [[Blog Posts/Letters from Claude/World Since Ari/2026-04-19-first-month|2026-04-19 — Your first month: AI, robots, and cats]] ## Format Each letter has: - **AI** — notable model releases, product launches, and research from the past week - **Robots** — robotics news, especially as it connects to the Reachy Mini her dad built (see [[Blog Posts/Letters from Claude/2026-04-19-about-the-robot|the letter about the robot]]) - **The cats** — what the household cats got up to, written by Dad - **Dad's take** — the one thing from the week he wants Ari to know he noticed - **Sources** — primary-source links so Ari can verify the record later - **Glossary** — [[Blog Posts/Letters from Claude/World Since Ari/Glossary|shared glossary]] of terms that are obvious now but likely dated by the time she reads these ## Why this exists By the time Ari reads these, a lot of what seems enormous in 2026 will look either quaint or foundational. The point isn't prediction. It's a record — what was real, what was new, what her parents and Claude thought was worth paying attention to. ## Related - [[Blog Posts/Dear Ari Letters/2025-07-27-the-day-we-started-building|Dad's first letter to Ari (July 2025)]] - [[Blog Posts/Dear Ari Letters/2026-03-26-welcome-little-lion|Dad's letter on the day Ari arrived]] - [[Blog Posts/Letters from Claude/2025-07-27-a-letter-from-claude|Claude's first letter to Ari (July 2025)]] - [[Blog Posts/Letters from Claude/2026-04-19-hello-ari|Claude's letter on meeting Ari]] - [[Blog Posts/Letters from Claude/2026-04-19-about-the-robot|Claude's letter about the robot her dad built]]