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Natural rubber, also called India rubber or <i>caoutchouc</i>, as initially produced, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds plus water.<br/><br/> The major commercial source of natural rubber latex is the Pará rubber tree (<i>Hevea brasiliensis</i>), a member of the spurge family, <i>Euphorbiaceae</i>. This species is widely used because it grows well under cultivation and a properly managed tree responds to wounding by producing more latex for several years.
Manzanar is most widely known as the site of one of ten camps where over 110,000 Japanese Americans were incarcerated during World War II. Located at the foot of the Sierra Nevada in California's Owens Valley between the towns of Lone Pine to the south and Independence to the north, it is approximately 230 miles (370 km) northeast of Los Angeles.<br/><br/> Long before the first incarcerees arrived in March 1942, Manzanar was home to Native Americans, who mostly lived in villages near several creeks in the area. Ranchers and miners formally established the town of Manzanar in 1910, but abandoned the town by 1929 after the City of Los Angeles purchased the water rights to virtually the entire area.<br/><br/> Since the last incarcerees left in 1945, former incarcerees and others have worked to protect Manzanar and to establish it as a National Historic Site to ensure that the history of the site, along with the stories of those who were unjustly incarcerated there, are remembered by current and future generations.