Although researchers have made many suggestions about what kind of particles might make up dark matter, there is no consensus. It’s an embarrassing hole in our understanding. Astronomical observations suggest that dark matter must make up about 90 per cent of the mass in the universe, yet we are astonishingly ignorant what that 90 per cent is.
What I like best about the preceding paragraph is the implicit notion that we are somehow beholden to something to be embarrassed by our limited understanding.
I like it a lot, actually.