Neutrinos are interesting. They have attracted the interest of particle physicists, nuclear physicists, stellar astrophysicists, cosmologists, and at least one noted poet. Neutrinos are also important. They play a fundamental part in the creation of the elements and the power for life on earth, they provide a way to see parts of the universe that would otherwise be unobservable, and they provide a serious challenge -- or perhaps a key -- to a deeper understanding of elementary particles. Many experiments have studied neutrinos from reactors, accelerators, cosmic rays, and the sun over the last 50 years. Arguably, the most interesting and important time in neutrino studies dawned in 2002, the "annus mirabilis" of neutrino physics in one author's words. The Kamioka Liquid scintillator Anti-Neutrino Detector (KamLAND) is an important part of this wonderful period of neutrino discoveries.

KamLAND is the world's biggest low-energy antineutrino detector, built using 1000 tons of liquid scintillator located 1000 meters underground in a 1000 year old Japanese mine. This talk will describe how it works, what it has already told us, and it will tell us soon about neutrinos, other particles, the sun, and even the earth.