I am looking for a word or phrase describing a research topic that many scientists and researchers are working on, but not finding any fundamental results. For example, deep learning right now.
Something that many people ardently desire, but that is very hard to obtain, is often called a holy grail. The phrase has been used in many contexts, including the scientific; googling for holy grail science brings up many examples.
- Tending to elude capture, perception, comprehension,