The race to discover dark matter has vexed physicists since the 1930s. Several theories have emerged in this “dark matter derby,” which are highlighted in a recent Discover magazine article. The Lab’s Hitoshi Murayama puts his money on Strongly Interacting Massive Particles, or SIMPs. https://www.discovermagazine.com/the-sciences/what-is-dark-matter-made-of-these-are-the-top-candidates