tool for distinguishing antineutrinos from backgrounds produced by other particles. To compensate for the loss in flux due to the long baseline, KamLAND has a much larger detection volume compared to earlier devices. The KamLAND detector uses a 1,000-metric-ton detection mass, which is over twice the size of similar detectors, such as Borexino. However, the increased volume of the detector also demands more shielding from cosmic rays, requiring the detector be placed underground. As part of the Kamland-Zen double beta decay search, a balloon of scintillator with 320 kg of dissolved xenon was suspended in the center of the detector in 2011. A cleaner rebuilt balloon is planned with additional xenon. KamLAND-PICO is a planned project that will install the PICO-LON detector in KamLand to search for dark matter. PICO-LON is a radiopure NaI(Tl) crystal that observes inelastic WIMP-nucleus scattering. Improvements to the detector are planned, adding light collecting mirrors and PMTs with higher quantum efficiency. Results Neutrino oscillation KamLAND started to collect data on January 17, 2002. First results were reported using only 145 days of data. Without neutrino oscillation, events were expected, however, only 54 events were observed. KamLAND confirmed this result with a 515-day data sample, 365.2 events were predicted in the absence of oscillation, and 258 events were observed. These results established antineutrino disappearance at high significance. The KamLAND detector not only counts the antineutrino rate, but also measures their energy. The shape of this energy spectrum carries additional information that can be used to investigate neutrino oscillation hypotheses. Statistical analyses in 2005 show the spectrum distortion is inconsistent with the no-oscillation hypothesis and two alternative disappearance mechanisms, namely the neutrino decay and de-coherence models. It is consistent with 2-neutrino oscillation and a fit provides the values for the Δm2 and θ parameters. Since KamLAND measures Δm2 most precisely and the solar experiments exceed KamLAND's ability to measure θ, the most precise oscillation parameters are obtained in combination with solar results. Such a combined fit gives and , the best neutrino oscillation parameter determination to that date. Since then a 3 neutrino model has been used. Precision combined measurements were reported in 2008 and 2011: Geological antineutrinos (geoneutrinos) KamLAND also published an investigation of geologically-produced antineutrinos (so-called geoneutrinos) in 2005. These neutrinos are produced in the decay of thorium and uranium in the Earth's crust and mantle. A few geoneutrinos were detected and these limited data