698 résultats pour "three"

• Isaac Newton.

  B Calculus (Newton’s “Fluxional Method”) In 1669 Newton gave his Trinity mathematics professor Isaac Barrow an important manuscript, which is generally known by its shortened Latin title, De Analysi . This work contained many of Newton’s conclusions about calculus (what Newton called his “fluxional method”). Although the paper was not immediately published, Barrowmade its results known to several of the leading mathematicians of Britain and Europe. This paper established Newton as one of the t...

• Stress (psychology).

  blood flow is diverted from the internal organs and skin to the brain and muscles. Breathing speeds up, the pupils dilate, and perspiration increases. This reaction issometimes called the fight-or-flight response because it energizes the body to either confront or flee from a threat. Another part of the stress response involves the hypothalamus and the pituitary gland, parts of the brain that are important in regulating hormones and many otherbodily functions. In times of stress, the hypothal...

• Mexican War.

  men, mostly Mexicans, rode to Nacogdoches to capture the rebellious Fredonians. The small garrison of Fredonians soundly defeated their attackers in the only battle ofthe rebellion. When Mexican troops arrived at Nacogdoches a short time later, the republic had been dissolved and the leader of the colonists had fled to Louisiana. B The Texas Revolution Although the Fredonians were not successful, by the 1830s the population of Mexican Texas included many immigrants from the United States. These...

• New Orleans - geography.

  D Metropolitan Region The New Orleans metropolitan region covers 8,800 sq km (3,400 sq mi) and includes the counties—known in Louisiana as parishes— of Orleans, Jefferson, Saint Bernard, Saint Charles, Saint John the Baptist, Saint Tammany, Saint James, and Plaquemines. At the center is the city of New Orleans, which is coextensive withOrleans Parish. It has a land area of 468 sq km (181 sq mi). Extending from this base are numerous suburban towns in the surrounding parishes. Metairie, Harahan...

• Telephone.

  digits is dialed. The development of inexpensive and reliable amplification provided by the introduction of the transistor in the 1960s made practical the design of adialing system based on the transmission of relatively low power tones instead of the higher-power dial pulses. Today most telephones have push buttons instead of a rotary dial. Touch-Tone is an optional service, and telephone companies still maintain the ability to receive pulsedialing. Push-button telephones usually have a switch...

• Bulgaria - country.

  E Climate Most of Bulgaria has a continental climate, with cold winters and hot summers. The climate in general is more severe than in other European areas of the samelatitudes, and the average annual temperature range is greater than that of neighboring countries. Severe droughts, frosts, winds, and hail storms frequently damagecrops. A Mediterranean climate, with dry summers and mild, humid winters, prevails in the valley of the southwestern Rhodope Mountains; the northern limit of theclimati...

• San Francisco - geography.

  recognized symbol of the city, opened in 1937. It connects San Francisco to Marin County to the north, one of the wealthiest suburban areas in the nation. With the construction of the Bay and Golden Gate bridges and other links from the city to its suburbs, the San Francisco Bay area has become one large metropolitanregion. San Francisco itself is only 122 sq km (47 sq mi) of land area, but the city’s Primary Metropolitan Statistical Area (defined by the Census Bureau as SanFrancisco, San Mateo,...

• Native American Architecture.

  B Relationship to the Universe and Nature A more profound difference between European American and Native American perceptions lay in how human beings saw themselves in relationship to the universe andin what they believed their responsibilities were to the natural world and to each other. Most European Americans saw themselves as separate from creation andadversaries of nature, ever struggling to conquer and subdue nature and force it to yield to their will. Native Americans saw themselves as...

• One of the three Baltic States, Estonia achieved independence in 1991.

• Grasses - biology.

  This, together with details of overall structure and less easily observed characteristics of anatomy, cytology, and chemistry, accounts for the tremendous number ofspecies of grasses. VI OTHER GRASSLIKE PLANTS Plants of two other groups, the sedges and the rushes, are superficially similar to grasses and are often confused with them. The three groups are easily distinguished,however, by examining their flowers, stems, and leaves. Rushes have flowers with six-part perianths (floral whorls) and...

• Babe Ruth.

  earned. But Ruth’s boyish exuberance, compassion for hospitalized children, and personal warmth and generosity endeared him to most people. During the 1926 World Seriesagainst the St. Louis Cardinals, Ruth received word that one of his fans, a boy named Johnny Sylvester, was hospitalized and extremely ill. Ruth wrote the boy atelegram and promised to hit a home run for him in that day’s game. Ruth made good on his promise with not only one, but three homers. And even at the height offame and for...

• Deoxyribonucleic Acid - biology.

  bacterium Escherichia coli . In 1998 scientists achieved the milestone of sequencing the complete genome of a multicellular organism—a roundworm identified as Caenorhabditis elegans . The Human Genome Project, an international research collaboration, was established to determine the sequence of all of the 3 billion nucleotide base pairs that make up thehuman genetic material. In 2003 scientists completed the sequencing of the human genome. The project identified nearly all of the estimated 20...

• Portland - geography.

  Garden arena, which opened in 1995. In 2000 the Portland Fire, an expansion Women's National Basketball Association team, began play in the Rose Garden as well. VI ECONOMY Portland enjoys a diversified economy. Major manufactured products include paper, transportation equipment, metal products, sportswear, and electronic componentsand equipment. Major corporations headquartered in the metropolitan region include Nike, a leader in the manufacture of sports footwear, in Beaverton; Louisiana-Paci...

• From Robinson Crusoe - anthology.

  How strange a Chequer-Work of Providence is the Life of Man! and by what secret differing Springs are the Affections hurry'd about as differing Circumstancespresent! To Day we love what to Morrow we hate; to Day we seek what to Morrow we shun; to Day we desire what to Morrow we fear; nay even tremble at theApprehensions of; this was exemplify'd in me at this Time in the most lively Manner imaginable; for I whose only Affliction was, that I seem'd banished from humanSociety, that I was alone, cir...

• Badminton.

  Once play has started, players tend to hit straight, low-flying shots called drives. When the shuttle remains close to the center of the court, net shots can be a goodoption. Net shots can be hard-hit or delicate. They are aimed at the front area of the opponent’s court, forcing the opponent to play the shot close to the net. If the opponent manages to return a net shot, the return must be hit high to clear the net. This gives the player a chance for a smash—the deadliest attacking stroke inbadm...

• Hurricane.

  V HOW HURRICANES ARE DETECTED AND MONITORED Since 1943 U.S. military and civilian aircraft have been flying into hurricanes to measure wind velocities and directions, the location and size of the eye, air pressures,and temperatures in different parts of the storm. A coordinated system of tracking hurricanes was developed in the mid-1950s, and steady improvements have beenmade over the years. In addition to reports from aircraft, geosynchronous weather satellites (since 1966) and ocean buoys tha...

• Zachary Taylor.

  army fled back across the Río Grande into Mexico. When Polk got word of the victories, he promoted Taylor to major general. Congress awarded him two gold medals. B1 Battle of Monterrey In September 1846, Taylor began an invasion of northern Mexico. His army of 6000 consisted of regulars and volunteers. On September 21 he attacked the fortifiedcity of Monterrey, which was defended by more than 7000 Mexicans under General Pedro de Ampudia. Taylor divided his army, giving Brigadier General William...

• Zachary Taylor

  army fled back across the Río Grande into Mexico. When Polk got word of the victories, he promoted Taylor to major general. Congress awarded him two gold medals. B1 Battle of Monterrey In September 1846, Taylor began an invasion of northern Mexico. His army of 6000 consisted of regulars and volunteers. On September 21 he attacked the fortifiedcity of Monterrey, which was defended by more than 7000 Mexicans under General Pedro de Ampudia. Taylor divided his army, giving Brigadier General William...

• Pittsburgh - geography.

  College of Allegheny County (1966), with branches in the city and suburbs. Pittsburgh has many outstanding cultural institutions. The Oakland district is where Carnegie Mellon University and the University of Pittsburgh are located. The CarnegieMuseums of Pittsburgh include The Carnegie Museum of Art (including the Scaife Galleries), which holds a distinguished motion-picture and video collection and a uniquestudy of architecture; the Carnegie Museum of Natural History, which displays an extensi...

• Wolfgang Amadeus Mozart.

  including the sacred style of church music and the so-called galant (courtly) idiom. The elegant though often superficial galant style dominated much instrumental music of the 1760s and 1770s. Mozart’s mastery often demonstrates itself in an ability to expand and deepen the stylistic possibilities of the time. The manner in which heextended the character and form of the concerto, for instance, owes much to his experience in writing operatic arias. A Musical Expressiveness In the masterful Je...

• Babylonia - USA History.

  Pharmacology, too, doubtless had made considerable progress, although the only major direct evidence of this comes from a Sumerian tablet written several centuriesbefore Hammurabi. C Legal System and Writing Law and justice were key concepts in the Babylonian way of life. Justice was administered by the courts, each of which consisted of from one to four judges. Often theelders of a town constituted a tribunal. The judges could not reverse their decisions for any reason, but appeals from their...

• Birth Control.

  without a prescription and used alone or with a condom, diaphragm, or cervical cap. Spermicides used alone must be inserted deep into the vagina before each act ofintercourse and a woman should not douche for six to eight hours after intercourse. With typical use, spermicides used alone are effective in preventing pregnancyabout 74 percent of the time. They may cause an allergic reaction such as irritation of the vagina or penis. B Intrauterine Device The intrauterine device (IUD) is a small pl...

• Grover Cleveland.

  Americans, Roman Catholics, and Southerners, who all generally supported the Democratic Party. The statement lost Blaine any chance of getting the Irish Americanvote in New York City. The Mugwumps supported Cleveland because of Blaine’s political past. Even the Prohibition Party candidate received 25,000 votes that normallywould have gone to the Republican candidate. New York’s 36 electoral votes swung the election to Cleveland. He won the state’s vote by only about 1000 in a total vote of more...

• Grover Cleveland

  Americans, Roman Catholics, and Southerners, who all generally supported the Democratic Party. The statement lost Blaine any chance of getting the Irish Americanvote in New York City. The Mugwumps supported Cleveland because of Blaine’s political past. Even the Prohibition Party candidate received 25,000 votes that normallywould have gone to the Republican candidate. New York’s 36 electoral votes swung the election to Cleveland. He won the state’s vote by only about 1000 in a total vote of more...

• Armenian Massacres .

  Some of the Armenian revolutionaries and others hoped that the massacres would provoke the intervention of the European powers (Britain, France, Austria-Hungary,and Germany). Although the leaders of the European powers publicly condemned the actions of the sultan, they failed to intervene. Mutual rivalries and suspicions, aswell as the imprecise terms of Article 61 of the Treaty of Berlin, helped produce this inaction. But these bloody episodes soon paved the way for the rise of a newnationalist...

• Declaration of Independence.

  communication networks to publicize British actions and encourage demonstrations of defiance. Soon these committees and some colonial legislatures issued a call for anall-colony congress to discuss other appropriate responses to Britain’s actions. The Continental Congress first met in Philadelphia from September to the end of October1774. This body did not plan for war; instead, it debated the extent to which the colonies should carry their resistance to Great Britain. The First Continental Cong...

• Declaration of Independence - U.

  communication networks to publicize British actions and encourage demonstrations of defiance. Soon these committees and some colonial legislatures issued a call for anall-colony congress to discuss other appropriate responses to Britain’s actions. The Continental Congress first met in Philadelphia from September to the end of October1774. This body did not plan for war; instead, it debated the extent to which the colonies should carry their resistance to Great Britain. The First Continental Cong...

• Solar System - astronomy.

  dwarf planets according to the IAU because they have rounded shapes from their own gravity but have not cleared their neighborhoods in space of other objects—bothorbit through the Kuiper Belt, a region beyond Neptune containing thousands of small icy bodies. Pluto and Eris are composed of layers of ice around a rocky core.Ceres qualifies as a dwarf planet because it is spherical but is found in the asteroid belt, a zone between the orbits of Mars and Jupiter that contains thousands of smallrocky...

• Gerald Ford.

  In May 1973 the Senate Select Committee on Presidential Activities opened hearings and in a series of startling revelations, Dean testified that Mitchell had ordered thebreak-in and that the president had authorized payments to the burglars to keep them quiet. The Nixon administration vehemently denied these assertions. In March 1974 a grand jury indicted Mitchell, Haldeman, Ehrlichman, and four other White House officials for their part in covering up the Watergate break-in andreferred to Nixon...

• Gerald Ford

  In May 1973 the Senate Select Committee on Presidential Activities opened hearings and in a series of startling revelations, Dean testified that Mitchell had ordered thebreak-in and that the president had authorized payments to the burglars to keep them quiet. The Nixon administration vehemently denied these assertions. In March 1974 a grand jury indicted Mitchell, Haldeman, Ehrlichman, and four other White House officials for their part in covering up the Watergate break-in andreferred to Nixon...

• Indo-Pakistani Wars - History.

  wrest Jammu and Kashmīr from India through the use of force. This effort failed as India held its ground, and the war ended in a stalemate after almost two months ofarmed conflict. Although the second war over the territory was shorter than the first, the increased firepower of the two nations resulted in a more deadly war, with atotal of about 6,800 battle casualties. A Events Before the War A number of factors precipitated the second conflict over Jammu and Kashm īr. In the wake of a border w...

• Reconstruction (U.

  Instead, Congress began a lengthy debate over Reconstruction policy. The program eventually enacted resulted from a series of compromises among Republicanfactions; the Radicals were never powerful enough to gain everything they sought. Still, fueled by anger at the president's refusal to compromise and at the appearanceof former Confederates returning to power throughout the South, members of Congress moved increasingly toward the Radicals. The key Reconstruction measuresenacted aimed to produce...

• From Bush v.

  legal requirements. This case has shown that punch card balloting machines can produce an unfortunate number of ballots which are not punched in a clean, complete way by the voter.After the current counting, it is likely legislative bodies nationwide will examine ways to improve the mechanisms and machinery for voting. B The individual citizen has no federal constitutional right to vote for electors for the President of the United States unless and until the state legislature chooses astatewide...

• Alcoholism.

  Although a consensus is growing among health professionals that alcohol dependence is a disease, society’s attitudes toward individuals with drinking problems remainambivalent and confused. Until the mid-20th century, the typical picture of the alcoholic was of someone without steady employment, unable to sustain familyrelationships and most likely in desperate financial straits. But this stereotype was largely dispelled when highly respected people publicly admitted their alcoholdependence and...

• Finland - country.

  Productive forestland is the most valuable natural resource of Finland. Spruce, pine, and silver birch are the principal trees used to manufacture wood and pulp andpaper products. Finland lacks coal and petroleum resources and is a net importer of energy resources. However, Finland does have significant deposits of peat, which is cut from thenumerous peat bogs that cover much of the north. Peat is an important heat source for homes, and it provides about 7 percent of Finland’s electricity needs....

• Martin Van Buren.

  political ambitions. The Clintonians cited as one example of Van Buren's unscrupulous methods his support of a convention in 1821 to revise the state's constitution. Van Buren and hisBucktails said they wanted to make the constitution more democratic. The Clintonians retorted that the real aim was to oust them from office. Both sides were right. Therevised constitution introduced a needed extension of voting rights and improved the operation of the state government. However, it also removed many...

• Martin Van Buren

  political ambitions. The Clintonians cited as one example of Van Buren's unscrupulous methods his support of a convention in 1821 to revise the state's constitution. Van Buren and hisBucktails said they wanted to make the constitution more democratic. The Clintonians retorted that the real aim was to oust them from office. Both sides were right. Therevised constitution introduced a needed extension of voting rights and improved the operation of the state government. However, it also removed many...

• United States House of Representatives.

  Because of the high cost of elections and the short two-year term of office, members of the House campaign almost constantly. They spend much of their time raisingcampaign funds, and they frequently return to their districts to keep in touch with voters. Because the elections are so frequent, House members tend to pay closeattention to how their votes in Congress will be seen in the short term. House members tend to come from wealthier family backgrounds than average Americans. Few working class...

• Nova Scotia - Geography.

  summer. Nova Scotia receives an average of more than 1,140 mm (45 in) of rain annually, with the Atlantic shore receiving 1,400 mm (55 in) or more. Most of the provincereceives about 1,900 mm (about 70 in) of snow, and considerable winter precipitation comes in the form of rain or ice storms. The average temperature in January, thecoldest month, is generally about -4°C (about 25°F) near the coast and somewhat colder toward the interior. The average temperature in July, the hottest month, isabout...

• Nova Scotia - Canadian History.

  summer. Nova Scotia receives an average of more than 1,140 mm (45 in) of rain annually, with the Atlantic shore receiving 1,400 mm (55 in) or more. Most of the provincereceives about 1,900 mm (about 70 in) of snow, and considerable winter precipitation comes in the form of rain or ice storms. The average temperature in January, thecoldest month, is generally about -4°C (about 25°F) near the coast and somewhat colder toward the interior. The average temperature in July, the hottest month, isabout...

• Rocket.

  the vacuum of space, however, demonstrated that this belief was not true. In fact, rockets produce more thrust in the vacuum of space than on Earth. Air pressure andfriction with the air reduce a rocket’s thrust by about 10 percent on Earth as compared to the rocket’s performance in space. B Thrust and Efficiency Thrust is a measurement of the force of a rocket, or the amount of “push” exerted backward to move a rocket forward. Thrusts vary greatly from rocket to rocket.Engineers measure thrust...

• Rocket - astronomy.

  the vacuum of space, however, demonstrated that this belief was not true. In fact, rockets produce more thrust in the vacuum of space than on Earth. Air pressure andfriction with the air reduce a rocket’s thrust by about 10 percent on Earth as compared to the rocket’s performance in space. B Thrust and Efficiency Thrust is a measurement of the force of a rocket, or the amount of “push” exerted backward to move a rocket forward. Thrusts vary greatly from rocket to rocket.Engineers measure thrust...

• Indian Treaties in Canada - Canadian History.

  Pontiac led an attack on British forts in the Great Lakes area to end British domination and to reinforce Indian autonomy. In response, British king George III issued theRoyal Proclamation of 1763 to try to appease the Indians of the interior. The proclamation set aside land for the Indians west of the Appalachian Mountains anddescribed this land as “lands reserved to [Indians] … as their Hunting Grounds.” The proclamation not only recognized Indian land ownership, but also required thattreaties...

• Islam.

  commanded to face the Kaaba, an ancient shrine in the city of Mecca. The Qur’an also refers to the recitation of parts of the Qur’an as a form of prayer. However, evenwith its numerous references, the Qur’an alone does not give exact instructions for this central ritual of prayer. The most detailed descriptions of the rituals for prayer derive from the example set by the prophet Muhammad and are preserved in later Islamic traditions. Somedetails of these rituals vary, however all Muslims agree t...

• Gorgons (Grim Ones) Greek Three female monsters (the Euryae); daughters of Ceto and Phorcys; sisters of the Graea.

• Medusa Greek One of the three Gorgons, the only one who was not immortal; her sisters were Stheno and Euryale.

• Stheno (Strong) Greek One of the three Gorgons, female monsters; daughter of Ceto, an ancient sea goddess, and Phorcys; her sisters were Euryale and Medusa.

• Eunomia (Order) Greek A goddess of order and lawful conduct and one of the three Horae, guardians of the seasons, with her sisters Dike (Justice) and Eirene (Peace).

• Euryal e (Wide-Stepping) Greek One of the three gorgons, female monsters; daughter of Ceto, an ancient sea goddess, and Phorcys; her sisters were Stheno and Medusa.

• Rex I INTRODUCTION Rex, a common name for any of three distinct breeds of curly-coated cat: the Cornish rex, the Devon rex, and the Selkirk rex.