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Tungsten is the only metal close enough to the density of gold that it can be substituted in certain types gold coins.
Lysander Spooner (January 19, 1808 — May 14, 1887) was an American abolitionist, entrepreneur, lawyer, essayist, natural rights legal theorist, pamphletist, political philosopher, and writer often associated with the Boston anarchist tradition.
Spooner's writings include the abolitionist book The Unconstitutionality of Slavery