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In common parlance, mass is [[weight]], but in [[science]], mass is a measurement of an object's inertia, or resistance to acceleration. It can also be describes as the degree to which an object bends space-time around it, according to the [[Theory of Relativity]]. One of the unsolved mysteries of [[physics]] is the origin of the rest-masses of the various particles is believed to be related to the [[Higgs boson]], which is currently being sought in [[particle accelerator]]s.
The scientific measure of weight is mass times acceleration due to [[gravity]].