Background
This collection brings together small tools created from concrete learning problems: fragmented materials, weak recall, unclear progress, and awkward mobile use.
Rather than beginning with a technology, each experiment begins with a task in an actual study workflow. The goal is to reduce friction, make knowledge structure visible, and turn passive review into a more active process.
Completed outcome
The collection includes early web tools, content-organization experiments, and reusable interaction patterns. Modern Chinese History Challenge is the most complete public example, combining active recall, practice, mock exams, and a local wrong-answer loop.
Limits and unfinished work
The experiments differ in maturity and have not all been tested with external users. Future work will keep only the approaches that demonstrate a clear learning benefit in real use.