i'm solving the "sitting is new smoking" problem. Basically an app that uses your webcam and local AI models to predict if you are sitting + your sitting posture, so you don't develop neck pain.
mega based project, i was thinking about the same. LLMs are very helpful for reading difficult books, or just books requiring previous context. i would add a feature of adding "auto preface" to the book so the reader know what he should know.