Neutrino Mass: The Present and the Future

We argue that the evidence for nonzero neutrino masses is quite compelling. Then, we turn to the questions about neutrinos raised by the presence of their nonzero masses. These questions include: How many different neutrinos are there? How much do they weigh? Is each neutrino identical to its antiparticle? Does the behavior of neutrinos violate CP? How will we confirm the present evidence concerning neutrino masses, and then go on to answer questions like these?