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.
... Warfare is a book of interviews with Noam Chomsky conducted by David Barsamian[?]. It was first published in the UK by Pluto Press[?] in 1996.
The contents runs ...