Johan Wilhelm Zetterstedt (1785-1874) was a Swedish naturalist who worked mainly on Diptera and Hymenoptera.
Read more about Johan Wilhelm Zetterstedt: Biography, Selected Works
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“Whatever does not spring from a man’s free choice, or is only the result of instruction and guidance, does not enter into his very being, but still remains alien to his true nature; he does not perform it with truly human energies, but merely with mechanical exactness.”
—Karl Wilhelm Von Humboldt (1767–1835)