ghost particle
 n.— «Often called “ghost particles,” neutrinos have almost no mass, no charge and possess an extremely weak interacting force, which enables them to move through any type of matter, almost as if it wasn’t there.» —“Physicists say multi-million dollar experiment advancing smoothly” by Paroma Basu University of Wisconsin–Madison Mar. 30, 2006. (source: Double-Tongued Dictionary)

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