> There is a lot of basic research done that does make a difference but where that difference is unknown to the original researcher -- perhaps separated too far

> There is a lot of basic research done that does make a difference but where that difference is unknown to the original researcher -- perhaps separated too far in time. I have found value in decades-old PhD theses in the life sciences, mainly physiology. Have you ever tried tracking down the author to express your appreciation? It might make their day (or month!).