Mindful Scrolling: spaced-repetition flashcard-like interface for resurfacing and contextualizing bookmarks and annotations

I am a daily spaced repetition flashcard user, beyond the immense benefits of long term memory training, they enable a really great UX that I'd like to see imitated in knowledge management apps: flashcard reviewing can fill small moments throughout the day, like while on public transit, waiting in line, etc. All these little moments where we have a couple minutes here and there. The kinds of moments that social media platforms try to suck out of us and trap us in a mindless trance-scroll. But, the more apps provide generative and productive affordances for, in a sense, replacing "scrolling" would be amazing.

I don't have a very clear/specific feature request, but I think it would be AMAZING if I could open the memex app in these moments and it randomly (or pseudo-randomly, or intentionally) surfaces bookmarks and annotations in a "stack"-like interface (similar to reviewing a flashcard deck). Where the interface prompts users to contextualize or connect (if memex supported backlinks across bookmarks and annotations that would be even better!) - or simply skip and load a new annotation if the currently presented one is not of interest in that moment.

Users could "scroll/sift" through and select a set of annotations as they surface randomly, clustering them and then contextualizing a group of annotations/bookmarks at the same time too.

There's lots to expand on and explore here, but I think if memex had something like this it would continue to be a core piece of my digital knowledge workflows.