Saturday, November 19, 2005

Stalin, Joseph

During the quarter of a century preceding his death, the Soviet dictator Joseph Stalin

Sunday, October 16, 2005

Vanadium

Vanadium was discovered

Thursday, July 28, 2005

National Action Bloc

The National Action Bloc attracted young, educated Moroccans of many different views. Informally in existence since 1930, under the leadership of such notable figures

Tuesday, July 26, 2005

Argentine Basin

Submarine basin in the floor of the Atlantic Ocean, lying directly east of Argentina. Its deepest sections, the western and southwestern margins, are called the Argentine Abyssal Plain and reach a maximum depth of 20,381 feet (6,212 m). The basin is bounded by the Rio Grande Rise (north), the Mid-Atlantic Ridge (east), the Falkland Rise (south), and the South American continental shelf

Saturday, July 23, 2005

Arrhenius Theory

Theory, introduced in 1887 by the Swedish scientist Svante Arrhenius, that acids are substances that dissociate in water to yield electrically charged atoms or molecules, called ions, one of which is a hydrogen ion (H+), and that bases ionize in water to yield hydroxide ions (OH-). It is now known that the hydrogen ion cannot exist alone in water solution; rather, it exists in a combined

Friday, July 08, 2005

Argentina, Independence

In Argentina the independence movement began in 1806–07, when British attacks on Buenos Aires were repelled in the two battles known as the Reconquista and the Defensa. Also important there, as elsewhere in Spanish America, were the ramifications of Napoleon I's intervention in Spain, beginning in 1808, which plunged that country into a civil war between two rival

Wednesday, July 06, 2005

Insectivore, Metabolism

Although insectivoran physiology has been studied in connection with special abilities, such as dormancy in hedgehogs, it is not well-known for the order. Of great interest are the smaller shrews, which, because of their minute size and relatively large ratio of body surface to volume, have an exceptionally high rate of metabolism, necessitated by the high rate of