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9/11

(Encyclopedia)9/11, the terrorist attacks on Sept. 11, 2001, in the United States, and the associated events and impact of those attacks. The attacks, which were carried out by agents of Al Qaeda (a militant Islami...

automobile industry

(Encyclopedia)automobile industry, the business of producing and selling self-powered vehicles, including passenger cars, trucks, farm equipment, and other commercial vehicles. By allowing consumers to commute long...

Nipah virus

(Encyclopedia)Nipah virus, RNA virus of the genus Henipavirus, family Paramyxoviridae, that rarely infects humans but can cause deadly encephalitis. In humans, the virus typically incubates for 4 to 14 days before ...

automobile racing

(Encyclopedia)automobile racing, sport in which specially designed or modified automobiles race on any of various courses. Automobile racing originated in France in 1894 and appeared in the United States the follow...

Niterói

(Encyclopedia)Niterói nētəroiˈ [key], city (1996 pop. 450,124), Rio de Janeiro prov., SE Brazil, on Guanabara Bay opposite the city of Rio de Janeiro. It is a residential suburb of Rio, and many of its citizens...

nitric oxide

(Encyclopedia)nitric oxide or nitrogen monoxide, a colorless gas formed by the combustion of nitrogen and oxygen as given by the reaction: energy + N2 + O2 → 2NO; m.p. −163.6℃; b.p. −151.8℃. Nitric oxide ...

nitrobenzene

(Encyclopedia)nitrobenzene, C6H5NO2, very poisonous, flammable, pale yellow, liquid aromatic compound with an odor like that of bitter almonds. It is sometimes called oil of mirbane or nitrobenzol. Nitrobenzene mel...

Nkrumah, Kwame

(Encyclopedia)Nkrumah, Kwame kwäˈmā nkro͞oˈmä [key], 1909–72, African political leader, prime minister ...

nobelium

(Encyclopedia)nobelium nōbēˈlēəm [key], artificially produced radioactive chemical element; symbol No; at. no. 102; mass no. of most stable isotope 259; m.p. 827℃; b.p. and density unknown; valence +2, +3. I...

Nobel Prize

(Encyclopedia)CE5 CE6 Nobel Prize, award given for outstanding achievement in physics, chemistry, physiology or medicine, peace, or literature. The awards were established by the will of Alfred Nobel, who left...