Which is really what makes them useful. Abstracts are great at what they try to be, but the typical abstract requires a lot of attention to actually read. These

Which is really what makes them useful. Abstracts are great at what they try to be, but the typical abstract requires a lot of attention to actually read. These summaries lend themselves to quickly scanning over a list of papers to figure out which ones you want to read the abstract of. They are somewhere between summaries and better titles.