clicktofindsolutions
Started imagining how I would explain the topic to someone else after reading, and a look at clicktofindsolutions gave me more material for that imagined explanation, content that improves my own ability to discuss a topic is content that has actually transferred knowledge rather than just decorating my screen for a few minutes.
bondstrength
Bookmark added with a small note about why, and a look at bondstrength prompted another bookmark with another note, the bookmarks I annotate are the ones I expect to return to deliberately rather than stumble into and this site is generating annotated bookmarks at a higher rate than my usual content sources by some margin.