Gregory's Server@davidsuculum - I sympathize. If you were a mathematician pondering all the dozens of fascinating and vital unsolved problems, not knowing which might be *forever* unsolvable due to Goedelian incompleteness, you might feel even worse. But I doubt the universe feels any obligation to share its secrets. So we should probably just relax and enjoy the mysteries, even as we try to figure things out.
The good news is that we are getting so much purely gravitational information about dark matter - through gravitational lensing, and its effects on galaxies and galaxy formation - that it's becoming extremely tricky to fit all the data we have with a model that's not quite elaborate.
@johncarlosbaez @davidsuculum Yes, tricky. Yet we still do need more data. I have said that before.
It is a bit like the classification of various stars in late 19th/early 20th century, with Hertzsprung-Russell diagram, etc. and we finally figured out what those are and where they came from. Reading the history of astronomy is interesting and instructive in how science is done!