| http://www.w3.org/ns/prov#value | - There is still some doubt even about the origin of the expression heavy metal, or, better, of the peculiar semantic alteration it is subjected to in the passage from the language of chemistry and metallurgy (where heavy metal means a metal with a specific gravity greater than about 5.0, especially one that is poisonous, such as lead or mercury: see Oxford English Dictionary s.v.) to the musical on
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