This article reviews that neutrinos are one of the fundamental building blocks of nature and a cornerstone of the standard theory of elementary particles. Three types are known to exist: the electron neutrino, the muon neutrino, and the tau neutrino. Electron neutrinos are emitted in vast numbers by the nuclear reactions that energize the sun. They are notoriously hard to detect and require the use of massive, sophisticated devices such as the Sudbury detector. The neutrino detector identifies the interaction between a solar neutrino and a molecule of heavy water inside the acrylic vessel. Bonding structural acrylic panels together is not like gluing a model together; it's more of a casting process so the light does not reflect off the bonds. The curing rate is important because air bubbles can get trapped in the bonding syrup if it hardens too quickly. With a tolerance on the bond gap of an eighth to a sixteenth of an inch, particularly when applied to a 40-foot-diameter sphere, the accuracy of the bonding process is critical.

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