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The Sudbury Neutrino Observatory (SNO) was an underground neutrino observatory in Ontario, Canada in operation from 1999 through 2006, aiming to detect solar neutrinos using a scintillator of heavy water (i.e., with 2H) with hopes of solving the solar neutrino problem. Super-K (in Japan) did this earlier, but SNO produced stronger confirmation. More recently, the detector has been revived in modified form, now called SNO+. It now uses a different substance as scintillator and its current goal is detection of neutrinoless double beta decay as well as general detection of neutrinos and of various particle interactions.