A brizospace particle that factors strongly in choice. Whenever any particle in any universe moves in one way or another, branching off parallel universes, a selection is made and accumulates in the interuniversal void, where they usually clump together and fuse into the subionic compound known as Tardium. Selections were first detected when old movie scripts dating pre-2000 were brought out of stock, where they were discovered in the form of Tardium. Later analysis of Tardium revealed its pure makeup of selections. When sufficiently agitated with a Polaron beam, Tardium will break up into its component selections, which will continue to alter the space-time continuum until slowly leaching out of the universe altogether via the theorized Brizospace Link. The only other mineral ever found to utilize selection is Plotdevicium.