This paper suggests new elementary particles, a specification for dark matter, and modeling regarding dark-energy phenomena. Thereby, this paper explains data that other modeling seems not to explain. Suggestions include some methods for interrelating properties of objects, some catalogs of properties, a method for cataloging elementary particles, a catalog of all known and some method-predicted elementary particles, neutrino masses, quantitative explanations for observed ratios of non-ordinary-matter effects to ordinary-matter effects, qualitative explanations for gaps between data and popular modeling regarding the rate of expansion of the universe, and insight regarding galaxy formation and evolution. Key assumptions include that nature includes six isomers of most elementary particles and that stuff that has bases in five isomers underlies dark-matter effects. Key new modeling uses integer-arithmetic equations; stems from, augments, and does not disturb successful popular modeling; and helps explain aspects and data regarding general physics, elementary-particle physics, astrophysics, and cosmology.