| http://www.w3.org/ns/prov#value | - These can range from such obviously dangerous things as cigarettes or gasoline (both ???natural??? to the degree a fur coat is ???natural,??? being highly changed products that originally derive from such natural products as plants and subterranean oil) to subtle elements such as Bisphenol-A (BPA), used in numerous food containers but implicated in concerns about its effect on human development (C
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