https://www.roobli.org/ Writing and works on RoobLi en https://www.roobli.org/writing/why-america-builds-productivity-tools https://www.roobli.org/writing/why-america-builds-productivity-tools Not ‘America loves Todoist.’ English-speaking professional strata, expensive labor, and ARR capital built a symptom market: micro-control for sale, responsibility sunk onto the self. Tue, 15 Sep 2026 00:00:00 GMT https://www.roobli.org/writing/apple-design-physics https://www.roobli.org/writing/apple-design-physics Rubber-band bounce, continuous corners, and one-handed MacBook open are not taste. They are damping ratios, G2 curvature, and rigid-body torque inequalities you can model. Fri, 11 Sep 2026 00:00:00 GMT https://www.roobli.org/works/cuda-cpp-course https://www.roobli.org/works/cuda-cpp-course Fifteen lessons and four in-browser GPU labs. English default, Chinese at /zh/. Finish without a local GPU; nine CUDA samples when you have one. Fri, 11 Sep 2026 00:00:00 GMT https://www.roobli.org/writing/keyboard-shortcut-systems https://www.roobli.org/writing/keyboard-shortcut-systems From Emacs prefixes and vi modes to Spotlight, command palettes, and Cmd+K: why power users treat keybindings as a namespace, and how KeyCombiner turns that into a practice system. Fri, 11 Sep 2026 00:00:00 GMT https://www.roobli.org/writing/cuda-course-without-a-gpu https://www.roobli.org/writing/cuda-course-without-a-gpu What “no GPU required” actually covers, what each of the four browser labs deliberately cuts, and when you still need a real card and Nsight. Fri, 11 Sep 2026 00:00:00 GMT