Neutrinos are the most abundant massive particle in the universe, but we still know very little about them. Even though they are one of the fundamental building blocks of the universe, we don’t know how much they weigh—or why they have mass at all. Our models predicted they wouldn’t. Neutrinos are a clue to new physics: ways of describing the world that we don’t know yet. They also might have unique properties that would help explain why the universe is made of matter instead of antimatter. Until we know more about these mysterious particles, we won’t know some of the secrets of our universe—or the ways we can harness them for more practical purposes. For more on this, see the FAQ: “What are the benefits of neutrino research?”
