Erebuni, ancient Urartian palace-fortress probably built by King Argishti I in the first quarter of the 8th century bc; it was located on the hill of Arin Berd, near modern Yerevan in Armenia. Excavations at Erebuni have centred on the palace and temple; both buildings contained important wall

Franklin expedition: …and officers of the HMS Erebus and HMS Terror perished under mysterious circumstances. The British navy launched the most extensive search effort in its history but recovered few bodies and found no trace of the ships. It took nearly 170 years before the Erebus and Terror were finally located in…

Erebus, in Greek religion, the god of a dark region of the underworld and the personification of darkness. Erebus is one of the primordial beings in the Greek creation myth. He is the son of Chaos, who is also the mother of Erebus’s wife, Nyx, the personification of night. The standard cosmology of

mountain: Residual mountain ranges and thermally uplifted belts: …the range are two volcanoes, Mount Erebus and Mount Terror, which probably owe their existence to a hot spot beneath them.

Erec, Middle High German epic poem by Hartmann von Aue, written about 1180–85 and considered the first Arthurian romance in German. This poem of some 10,000 lines is a loose translation of a work by Chrétien de Troyes about one of the knights of the Round Table. The story concerns the duties and

Chrétien de Troyes: …author of five Arthurian romances: Erec; Cligès; Lancelot, ou Le Chevalier à la charrette; Yvain, ou Le Chevalier au lion; and Perceval, ou Le Conte du Graal. The non-Arthurian tale Guillaume d’Angleterre, based on the legend of St. Eustace, may also have been written by Chrétien.

Chrétien de Troyes: …author of five Arthurian romances: Erec; Cligès; Lancelot, ou Le Chevalier à la charrette; Yvain, ou Le Chevalier au lion; and Perceval, ou Le Conte du Graal. The non-Arthurian tale Guillaume d’Angleterre, based on the legend of St. Eustace, may also have been written by Chrétien.

Erech, ancient Mesopotamian city located northwest of Ur (Tall Al-Muqayyar) in southeastern Iraq. The site has been excavated from 1928 onward by the German Oriental Society and the German Archeological Institute. Erech was one of the greatest cities of Sumer and was enclosed by brickwork walls

Mesopotamian art and architecture: Architecture: …architectural design during this so-called Protoliterate period (c. 3400–c. 2900 bce) are recognizable in the construction of religious buildings. There is, however, one temple, at Abū Shahrayn (ancient Eridu), that is no more than a final rebuilding of a shrine the original foundation of which dates back to the beginning…

Erechtheum, ionic temple of Athena, built during 421–405 bc on the Acropolis at Athens, famous largely for its complexity and for the exquisite perfection of its details. The temple’s Ionic capitals are the most beautiful that Greece produced, and its distinctive porch, supported by caryatid

Erechtheus: In his lost play Erechtheus, Euripides gave that king three daughters, one of whom was appropriately named Chthonia. At war with neighbouring Eleusis and its ally King Eumolpus, Erechtheus learned from the god Apollo that Athens would win if he sacrificed his daughter. He sacrificed Chthonia, and her sisters…

Erechtheus, legendary king and probably also a divinity of Athens. According to the Iliad, he was born from the corn land and raised by the goddess Athena, who established him in her temple at Athens. In later times only a great snake was thought to share the temple with Athena, and there is

primate: Bipedalism: All primates sit upright. Many stand upright without supporting their body weight by their arms, and some, especially the apes, actually walk upright for short periods. The view that the possession of uprightness is a solely human attribute is untenable; humans are merely the one species of the…

erect-crested penguin, (Eudyptes sclateri), species of crested penguin (genus Eudyptes, order Sphenisciformes) characterized by plumes of yellow feathers extending from the bill to the back of the head, running above each eye (the superciliary stripe); the plumes often stand fully upright at the

Erechtheum, ionic temple of Athena, built during 421–405 bc on the Acropolis at Athens, famous largely for its complexity and for the exquisite perfection of its details. The temple’s Ionic capitals are the most beautiful that Greece produced, and its distinctive porch, supported by caryatid

impotence, in general, the inability of a man to achieve or maintain penile erection and hence the inability to participate fully in sexual intercourse. In its broadest sense the term impotence refers to the inability to become sexually aroused; in this sense it can apply to women as well as to

impotence, in general, the inability of a man to achieve or maintain penile erection and hence the inability to participate fully in sexual intercourse. In its broadest sense the term impotence refers to the inability to become sexually aroused; in this sense it can apply to women as well as to

erection, enlargement, hardening, and elevation of the male reproductive organ, the penis. Internally, the penis has three long masses of cylindrical tissue, known as erectile tissue, that are bound together by fibrous tissue. The two identical areas running along the sides of the penis are termed

Charles Bukowski: …newspaper column of that name, Erections, Ejaculations, Exhibitions, and General Tales of Ordinary Madness (1972), and Hot Water Music (1983). His later novels include Post Office (1971), Factotum (1975), and Ham on Rye (1982). Hollywood (1989), also a novel, took as its subject the filming of the 1987

erector spinae, a deep muscle of the back; it arises from a tendon attached to the crest along the centre of the sacrum (the part of the backbone at the level of the pelvis, formed of five vertebrae fused together). When it reaches the level of the small of the back, the erector divides into three

Ereğli, town, northern Turkey. It is situated on the Black Sea coast about 20 miles (32 km) southwest of Zonguldak. The town was founded about 560 bce as Heraclea Pontica by a colony of Megarians who soon subjected the native Mariandynians and extended their control over most of the coast. In 74

Ereğli, town, south-central Turkey. It stands near the foot of the central Taurus Mountains on the northern approach to the Cilician Gates, a major pass. A frontier fortification of the Byzantine Empire, then known as Heraclea Cybistra, the town lay in the way of invading armies and was captured by

Georgia: Turkish and Persian domination: When Tʿeimuraz died, his son Erekle II reunited the kingdoms of Kartli and Kakheti and made a brave attempt at erecting a Caucasian multinational state based on Georgia. Imereti under King Solomon I (1752–84) succeeded in finally throwing off the domination of the declining Ottoman Empire.

Australia: Vegetation: The Eremian Zone covers the whole of central Australia through to the west-central coast; its climate is arid.

golden mole: Natural history: Grant’s golden mole (Eremitalpa granti) of southern Africa is a sand-dune inhabitant. It does not live in burrows but travels at night on the dune surface or just below, employing its front limbs and muzzle to “swim” through the sand. During the day it buries…

Andrea Mantegna: Formative years in Padua: …the Ovetari Chapel in the Eremitani Church in Padua. The figures of Saints Peter, Paul, and Christopher in the apse, his earliest frescoes in this chapel, show to what extent he had already absorbed the monumental figure style of Tuscany. In the St. James Led to Martyrdom in the lowest…

hermit, one who retires from society, primarily for religious reasons, and lives in solitude. In Christianity the word (from Greek erēmitēs, “living in the desert”) is used interchangeably with anchorite, although the two were originally distinguished on the basis of location: an anchorite selected

idiorrhythmic monasticism, the original form of monastic life in Christianity, as exemplified by St. Anthony of Egypt (c. 250–355). It consisted of a total withdrawal from society, normally in the desert, and the constant practice of mental prayer. The contemplative and mystical trend of eremitic

Sven Delblanc: His first novel, Eremitkräftan (1962; “The Hermit Crab”), was an allegorical exploration of the roles of freedom, love, and mysticism in human existence. He continued to pursue those themes in such novels as Prästkappan (1963; “The Cassock”), set in late 18th-century Germany, and Kastrater (1975; The Castrati), set…

lark: …horned, or shore, lark (Eremophila alpestris) is native to the New World. The bill is quite variable: it may be small and narrowly conical or long and downward-curving; and the hind claw is long and sometimes straight. Plumage is plain or streaked (sexes usually alike) in a colour closely…

Tien Shan: Physiography: …the eastern Tien Shan: the Eren Habirga Mountains, which reach elevations of 18,200 feet (5,550 metres). The ridge has considerable glacial development, as well as numerous forms of relief that indicate the area was the site of ancient glaciation.

Erenhot, city, north-central Inner Mongolia Autonomous Region, China. It is located in the Gobi (desert) near the border with Mongolia, on the Trans-Mongolian railway. A railway was built southward in 1954 from a location called Eren Station. Around this was constructed a complex of buildings that

Bulgaria: Political divisions under Alexander of Battenberg: Casimir Erenroth, a Finn in Russian service who had earlier been charged with setting up the Bulgarian army. Erenroth used rigged elections to select the Grand National Assembly, which agreed in 1881 to suspend the constitution and invest the prince with absolute power for seven…

Nissaba: …Sumerian deity, city goddess of Eresh on the ancient Euphrates River near Uruk in the farming regions; she was goddess of the grasses in general, including the reeds and the cereals. As goddess of the reeds and provider of the reed stylus used by the scribes, she became the patroness…

Ereshkigal, in Mesopotamian religion, goddess in the Sumero-Akkadian pantheon who was Lady of the Great Place (i.e., the abode of the dead) and in texts of the 3rd millennium bc wife of the god Ninazu (elsewhere accounted her son); in later texts she was the wife of Nergal. Ereshkigal’s sister was

porcupine: New World porcupines (family Erethizontidae): The North American porcupine (Erethizon dorsatum) is the largest in the family, usually weighing less than 7 kg (15.4 pounds), though males occasionally grow significantly larger. Its body is up to 80 cm (31 inches) long, with a tail up to 30 cm (12 inches). Both…

porcupine: …embedded in clusters, whereas in New World porcupines (Erethizontidae) single quills are interspersed with bristles, underfur, and hair. No porcupine can throw its quills, but they detach easily and will remain embedded in an attacker. Base coloration ranges from grayish brown through dark brown to blackish, but this colouring is…

sea turtle: Physical features and feeding habits: The hawksbill sea turtle (Eretmochelys imbricata) is largely tropical and common in coral reef habitats, where it feeds on sponges and a variety of other invertebrates. The flatback sea turtle (Natator depressa) occurs in the seas between Australia and New Guinea; it also feeds on a…

Eretna dynasty: The dynasty’s founder, Eretna, was an officer of Uyghur origin in the service of Demirtaş, the Il-Khanid governor of Anatolia, who revolted (1326) against the Il-Khanid ruler Abū Saʿīd and escaped to Egypt. Eretna then became governor of Anatolia under the suzerainty of Ḥasan the Elder, ruler of…

Eretna dynasty, dynasty that succeeded the Mongol Il-Khanid rulers in central Anatolia and ruled there from c. 1343 to 1380. The dynasty’s founder, Eretna, was an officer of Uyghur origin in the service of Demirtaş, the Il-Khanid governor of Anatolia, who revolted (1326) against the Il-Khanid ruler

Eretria, ancient Greek coastal town of the island of Euboea. Jointly with its neighbour Chalcis, it founded Cumae in Italy (c. 750 bce), the first of the Greek colonies in the west; it then established colonies of its own in Chalcidice and Macedonia. Inter-city cooperation became competition, then

Palestine, area of the eastern Mediterranean region, comprising parts of modern Israel and the Palestinian territories of the Gaza Strip (along the coast of the Mediterranean Sea) and the West Bank (west of the Jordan River). The term Palestine has been associated variously and sometimes

scorpaeniform: Annotated classification: Family Ereuniidae 4 lower pectoral fin rays free (as in family Triglidae); vertebrae 35–39. Maximum length 30 cm (12 inches). Marine, deepwater, western North Pacific. 2 genera with 3 species. Family Abyssocottidae Postcleithra reduced or absent; pelvic fin with 1 spine and 2–4 soft rays; vertebrae…

Yerevan, capital of Armenia. It is situated on the Hrazdan River, 14 miles (23 km) from the Turkish frontier. Though first historically recorded in 607 ce, Yerevan dates by archaeological evidence to a settlement on the site in the 6th–3rd millennia bce and subsequently to the fortress of Erebuni

Erewash, borough (district), administrative and historic county of Derbyshire, England. Its eastern boundary is the River Erewash, from which the borough takes its name. It is bounded on the south by the Rivers Trent and Derwent, and to the west it extends as far as Derby and the River Derwent at

Erewhon, satirical novel by Samuel Butler, first published anonymously in 1872. During Butler’s lifetime, his reputation rested on the success of Erewhon, which he claimed as his own when it met with immediate approval. It was the only work from which Butler earned a profit. The name of the realm

Erewhon, satirical novel by Samuel Butler, first published anonymously in 1872. During Butler’s lifetime, his reputation rested on the success of Erewhon, which he claimed as his own when it met with immediate approval. It was the only work from which Butler earned a profit. The name of the realm

history of Europe: The impact of the slump: …some industrialists, and the so-called Erfüllungspolitik, or “policy of fulfillment,” advocated by Rathenau and Stresemann. They proposed to meet initial demands for reparations so as to reestablish trust and then negotiate for better terms. This was the policy adopted by the Weimar Republic.

Erfurt, city, capital of Thuringia Land (state), central Germany. It is located in the Thuringian Basin, on the Gera River, 200 miles (320 km) southwest of Berlin. It was first mentioned in 724 as Erpesfurt, the site of an abbey and a royal residence at a ford (Furt) on the Gera (originally named

Karl Kautsky: …the Social Democrats adopted his Erfurt Program, which committed the party to an evolutionary form of Marxism that rejected both the radicalism of Rosa Luxemburg and the evolutionary socialist doctrines of Bernstein. Kautsky served as the German Social Democrats’ authority on Marxism until World War I, when he joined the…

Erfurt Union Parliament, (March 20–April 29, 1850), conference called by Prussia to form a union of German states headed jointly by Prussia and Austria. Opposed by Austria, the plan failed to win the adherence of the other large German states and had to be renounced by Prussia in the Punctation of

Charles-Maurice de Talleyrand, prince de Bénévent: Between empire and restoration: …congress of European sovereigns at Erfurt, Prussia. There Talleyrand had secret talks with Tsar Alexander I, urging him to oppose Napoleon, and thereafter conducted a clandestine correspondence with both Russia and Austria. This treasonable activity did not, in fact, involve Talleyrand in great risk, since it was approved by Fouché,…

Erfurt Union Parliament, (March 20–April 29, 1850), conference called by Prussia to form a union of German states headed jointly by Prussia and Austria. Opposed by Austria, the plan failed to win the adherence of the other large German states and had to be renounced by Prussia in the Punctation of

Hugo Erfurth was a German photographer noted mainly for his portraits of artists, intellectuals, and celebrities of the 1920s. Erfurth studied art at the Academy of Arts in Dresden, Germany, from 1892 to 1896. He worked as a portrait photographer in Dresden from 1896 until about 1925. Many artists,

erg, in a desert region, area of large accumulation of sand, generally in the bottom of a huge basin in which a former river piled up alluvium. Ergs are areas of actively shifting dunes, “fossilized” dunes, or extensive sand sheets. The sand is generally loose and is extremely difficult to cross.

human eye: Bleaching of rhodopsin: Thus, the electroretinogram (ERG) is the record of changes in potential between an electrode placed on the surface of the cornea and an electrode placed on another part of the body, caused by illumination of the eye.

erg, unit of energy or work in the centimetre-gram-second system of physical units used in physics; to lift a pound weight one foot requires 1.356 × 107 ergs. It equals the work done by a force of one dyne acting through a distance of one centimetre and is equal to 10-7 joule, the standard unit of

international law: Hierarchies of sources and norms: …has established a category of erga omnes (Latin: “toward all”) obligations, which apply to all states. Whereas in ordinary obligations the defaulting state bears responsibility toward particular interested states (e.g., other parties to the treaty that has been breached), in the breach of erga omnes obligations, all states have an…

ergativity, Tendency of a language to pair the subject, or agent, of an intransitive verb with the object, or patient, of a transitive verb. This contrasts with the situation in nominative-accusative languages such as Latin or English, in which the subjects of both transitive and intransitive verbs

vitamin D: …plants and better known as ergocalciferol (or calciferol), and vitamin D3, found in animal tissues and often referred to as cholecalciferol. Both of these compounds are inactive precursors of potent metabolites and therefore fall into the category of prohormones. This is true not only for cholecalciferol and ergocalciferol obtained from…

George David Birkhoff: …20th century, who formulated the ergodic theorem.

Elon Lindenstrauss: His work involved ergodic theory (a branch of mathematics that arose from statistical physics), which he used to make significant progress on problems in number theory, such as the Littlewood conjecture about approximations to irrational numbers, and in quantum chaos, such as the quantum unique ergodicity conjecture.

human-factors engineering, science dealing with the application of information on physical and psychological characteristics to the design of devices and systems for human use. The term human-factors engineering is used to designate equally a body of knowledge, a process, and a profession. As a

drug: Drugs that affect smooth muscle: …constituents of ergot, ergotamine and ergonovine are the most important. The main effect of ergotamine is to constrict blood vessels, sometimes so severely as to cause gangrene of fingers and toes. Dihydroergotamine, a derivative, can be used in treating migraine. Ergonovine has much less effect on blood vessels but a…

ergosterol, a white crystalline organic solid of the molecular formula C28H44O belonging to the steroid family. It is found only in fungi (e.g, Saccharomyces and other yeasts and Claviceps purpurea, the cause of ergot, a fungal disease of cereal grasses) and is chemically related to cholesterol.

ergot, fungal disease of cereal grasses, especially rye, caused by species of the ascomycete fungus Claviceps. The disease decreases the production of viable grains by infected plants and can contaminate harvests. Ergot is commonly associated with rye infected by C. purpurea, but other economically

Ascomycota: >C. purpurea, the cause of ergot of rye and ergotism in humans and domestic animals.

drug: Drugs that affect smooth muscle: …biologically active constituents of ergot, ergotamine and ergonovine are the most important. The main effect of ergotamine is to constrict blood vessels, sometimes so severely as to cause gangrene of fingers and toes. Dihydroergotamine, a derivative, can be used in treating migraine. Ergonovine has much less effect on blood vessels…

semen: …ampulla secretes a yellowish fluid, ergothioneine, a substance that reduces (removes oxygen from) chemical compounds, and the ampulla also secretes fructose, a sugar that nourishes the sperm.

Kleitias: The vase is signed “Ergotimos epoiēsen; Kleitias egraphsen” (“Ergotimos made [me]; Kleitias painted [me]”).

St. Anthony of Egypt: Anthony’s fire (or ergotism). The black-robed Hospitallers, ringing small bells as they collected alms, were a common sight in many parts of western Europe. The bells of the Hospitallers, as well as their pigs—allowed by special privilege to run free in medieval streets—became part of the later iconography…

Argun River, river rising in the Inner Mongolia Autonomous Region of China, on the western slope of the Greater Khingan Range, where it is known as the Hailar River. Its length is 1,007 miles (1,620 km), of which about 600 miles (965 km) form the boundary between China and Russia. Near Luoguhe, the

Lake Er, lake in western Yunnan province, China. It lies in a deep basin at the eastern foot of the snow-covered Diancang range (also called Cang Shan) between the upper waters of the Yangtze River (Chang Jiang), there called the Jinsha River, and the Mekong River. Lake Er is the last remnant of a

erhu, bowed, two-stringed Chinese vertical fiddle, the most popular of this class of instruments. The strings of the erhu, commonly tuned a fifth apart, are stretched over a wooden drumlike resonator covered by a snakeskin membrane. Like the banhu, the erhu has no fingerboard. The strings are

Erenhot, city, north-central Inner Mongolia Autonomous Region, China. It is located in the Gobi (desert) near the border with Mongolia, on the Trans-Mongolian railway. A railway was built southward in 1954 from a location called Eren Station. Around this was constructed a complex of buildings that

Erya, an early Chinese lexicon that is considered a classic work of Chinese literature and is sometimes ranked with the Wujing (“Five Classics”) in importance and influence. The Erya, possibly assembled in the Qin (221–207 bce) or early Han (206 bce–220 ce) dynasty, is a compilation of words found

Tanzania: Early exploration: It was a fellow missionary, Jakob Erhardt, whose famous “slug” map (showing, on Arab information, a vast shapeless inland lake) helped stimulate the interest of the British explorers Richard Burton and John Hanning Speke. They traveled from Bagamoyo to Lake Tanganyika in 1857–58, and Speke also saw Lake Victoria. This…

Ludwig Erhard was an economist and statesman who, as economics minister (1949–63), was the chief architect of West Germany’s post-World War II economic recovery. He served as German chancellor from 1963 to 1966. Following World War I, Erhard studied economics, eventually joining an economics

erhu, bowed, two-stringed Chinese vertical fiddle, the most popular of this class of instruments. The strings of the erhu, commonly tuned a fifth apart, are stretched over a wooden drumlike resonator covered by a snakeskin membrane. Like the banhu, the erhu has no fingerboard. The strings are

Chinese music: Jingxi (Peking opera): …two prototypes called xipi and erhuang. Within each of these general types there are several well-known tunes, but the word prototype has been used to define them, as each opera and each situation is capable of varying the basic melody greatly. The two basic identifying factors are the mode of…

Oceanic literature: The influence of oral traditions: For example, Vincent Eri in his first novel, The Crocodile (1970), tried to give a sense of the spiritual world of the precontact society of Papua New Guinea, and he used traditional myths, legends, and tales of magic to express the life of a village where the…

plume grass, (genus Saccharum), genus of about 20 species of grasses in the family Poaceae, native to warm regions of the Northern and Southern hemispheres. The genus comprises the sugarcanes (notably Saccharum officinarum) and several ornamental species, including Ravenna grass (S. ravennae).

Frederic William Farrar: …sentimental novel of school life, Eric; or, Little by Little (1858).

heath, (genus Erica), genus of about 800 species of low evergreen shrubs of the family Ericaceae. Most heath species are indigenous to South Africa, where they are especially diverse in the southwestern Cape region. Some also occur in the Mediterranean region and in northern Europe, and species

heath: The white, or tree, heath, or giant heather (E. arborea), found in the Mediterranean region and parts of Africa, is the source of briar root, used for making briarwood pipes. Some southern African species (e.g., E. melanthera, E. verticillata, and E. ventricosa) are cultivated in cool…

heath: The purple, or Scotch, heath, or bell heather (Erica cinerea), is common in Great Britain and western Europe. Its minute flowers yield much nectar. Other British species are cross-leaved heath, or bog heather (E. tetralix); Cornish heath (E. vagans), found also in western Europe; and fringed,…

heath: …outdoors in southwestern North America; E. verticillata is considered extinct in the wild. See also heather.

Ericaceae, the heath family of flowering plants (order Ericales), comprising 126 genera and some 4,000 species. Ericaceae is made up mostly of shrubs and small trees, and its members are widely distributed, extending into the subarctic and along mountain chains through the tropics. A large

Ericales, rhododendron order of flowering plants, containing 22 families, 346 genera, and more than 12,000 species. The relationships of the order are unclear. Together with Cornales, it is placed as a basal asterid in the Angiosperm Phylogeny Group IV (APG IV) botanical classification system (see

Erice, town, northwestern Sicily, Italy; it lies at 2,464 feet (751 m) above sea level on the top of Monte San Giuliano (also called Monte Erice), just northeast of Trapani city. The town originated as a settlement of the Elyrir (an ancient Sicilian tribe) and was fortified by the Phoenicians and

homopteran: Glandular secretions: …producers are males of the Chinese wax scale Ericerus pe-la that secrete large amounts of pure white wax useful in making candles. The Indian wax scale Ceroplastes ceriferus secretes a wax that is used for medicinal purposes.

Arthur Erickson was a Canadian architect. He first earned wide recognition with his plan for Simon Fraser University (1963–65), designed with Geoffrey Massey, which included an enormous skylit indoor plaza serving as a sensitive response to a cool, rainy climate. Robson Square, Vancouver (1978–79),

Arthur Erickson was a Canadian architect. He first earned wide recognition with his plan for Simon Fraser University (1963–65), designed with Geoffrey Massey, which included an enormous skylit indoor plaza serving as a sensitive response to a cool, rainy climate. Robson Square, Vancouver (1978–79),

Reed Erickson was a transgender philanthropist who helped to fund early research on transsexual and transgender issues and to increase the visibility of transsexuality in the United States. Rita Erickson grew up in Philadelphia and graduated from the Philadelphia High School for Girls. Erickson

Reed Erickson was a transgender philanthropist who helped to fund early research on transsexual and transgender issues and to increase the visibility of transsexuality in the United States. Rita Erickson grew up in Philadelphia and graduated from the Philadelphia High School for Girls. Erickson

psychedelic rock: …by the wayward talent of Roky Erickson, a gifted musician who was later hospitalized for mental illness, the 13th Floor Elevators released four frenetic albums featuring bizarre jug-blowing blues before imploding in 1969. On the East Coast, the Velvet Underground symbolized a nihilistic cool version of psychedelia, picking up on…

Bluetooth: In 1998 Ericsson, the Swedish manufacturer of mobile telephones, assembled a consortium of computer and electronics companies to bring to the consumer market a technology they had been developing for several years that was aimed at freeing computers, phones, personal digital assistants (PDAs), and other devices from…

John Ericsson was a Swedish-born American naval engineer and inventor who built the first armoured turret warship and developed the screw propeller. After serving in the Swedish army as a topographical surveyor, Ericsson went to London in 1826 and constructed a steam locomotive, the Novelty, for a

Eridanus, constellation in the southern sky at about 4 hours right ascension and that stretches from the celestial equator to about 60° south in declination. Its brightest star is Achernar, the ninth brightest star in the sky, with a magnitude of 0.5. This constellation contains Epsilon Eridani,

Eridu, ancient Sumerian city south of Tall al-Muqayyar (ancient Ur), Iraq. Eridu was revered as the oldest city in Sumer, according to the king lists, and its patron god was Ea (Enki), “lord of the sweet waters that flow under the earth.” The city’s site, located at a mound called Abū Shahrayn, was