Boron, arsenic, and antimony, among other substances, are used as dopants when added to a pure semiconductor material to alter its electrical characteristics.
Artificially produced gemstones[?] (such as Ruby (gemstone)) usually contain a dopant to identify them as such.
... arctic explorer, scientist and international statesman
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Francisco de Orellana - first to navigate down the Amazon River
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William Parry[?], (born 1790), Arctic ...