matter nuclei blacktop matter deconversion
super_weakly_interacting_massive_particle is dark_matter. weakly_interacting_massive_particle is not dark_matter. sterile_neutrino is dark_matter. black_spot is plant_disease. weakly_interacting_massive_particle is dark_matter. grey_matter is internal_body_part. grey_matter is anatomical_structure. gaseous_mercury is gas. gaseous_mercury is mercury.