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== Science == * [[Negative predictive value]], in biostatistics, the proportion of patients with negative test results who are correctly diagnosed * [[Nuclear Polyhedrosis Virus]], a virus that infects butterflies and moths * [[Negative refraction|Negative Phase Velocity]], an electromagnetic property induced by some exotic optical materials * [[Negative pressure ventilator]], a type of [[mechanical ventilator]] that stimulates an ill person's breathing by periodically applying negative air pressure to their body to expand and contract the chest cavity
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