Exploring the Neutrino Questions

Neutrinos are the most elusive of the fundamental constituents of matter and are responsible for the biggest particle physics discovery of the past decade: contrary to theoretical expectations, it is now established that neutrinos have mass. I'll review what we have learned about neutrino properties, and describe a list of known unknowns that can only be addressed by several distinct next-generation neutrino experiments. I'll also discuss what we have learned about the new physics unlocked by neutrino experiments, and speculate about what we can hope to learn in the near future.