cribbage: The play and the showing: …is “lurched” (“left in the lurch”) and, if the play is for stakes, loses doubly. (As sometimes played, the winner must be able to count out to exactly 121, just as, in playing for a go, he tries to reach 31 exactly. Thus, for example, if a player’s score is…

cribbage: The play and the showing: …is “lurched” (“left in the lurch”) and, if the play is for stakes, loses doubly. (As sometimes played, the winner must be able to count out to exactly 121, just as, in playing for a go, he tries to reach 31 exactly. Thus, for example, if a player’s score is…

lur, bronze horn, or trumpet, found in prehistoric Scandinavian excavations. It has a conical bore that extends in length from roughly 5 to 8 feet (1.5 to 2.5 metres) in a bent S-shape (somewhat resembling a mammoth tusk) and ends in an embossed metal disk. The mouthpiece of the lur is permanently

mayfly: Ecology: …to predation by fishes; artificial lures used by human fishers are patterned after them.

Sir Henry Segrave: His book, The Lure of Speed, was published in 1928. He was knighted in 1929.

Douglas Sirk: Hollywood films of the 1940s: Sirk followed it with Lured (1947), a thriller in which Sanders menaced Lucille Ball.

Sue Goyette: Early work: Set in Beaumont, Quebec, Lures (2002) is Goyette’s first novel. In it children from two troubled, unconventional families—an obsessive, neat-freak mother, a father who stalks boys, a lost pothead brother—suffer under the strain of unresolved pain and unspoken love. Each of the children finds solace in different ways, but…

Lurgan, market town, Armagh City, Banbridge and Craigavon district, southeastern Northern Ireland. In 1610 James I granted land to John Brownlow, who formed an English colony there. By the end of the 17th century, linen manufacture was established. James Logan emigrated from Lurgan in 1699 to

coal utilization: The Lurgi system: The most important fixed-bed gasifier available commercially is the Lurgi gasifier, developed by the Lurgi Company in Germany in the 1930s. It is a dry-bottom, fixed-bed system usually operated at pressures between 30 and 35 atmospheres. Since it is a pressurized system, coarse-sized…

A.R. Luria was a Soviet neuropsychologist. After earning degrees in psychology, education, and medicine, he became a professor of psychology at Moscow State University and later head of its department of neuropsychology. Influenced by his former teacher L.S. Vygotsky, he studied language disorders

A.R. Luria was a Soviet neuropsychologist. After earning degrees in psychology, education, and medicine, he became a professor of psychology at Moscow State University and later head of its department of neuropsychology. Influenced by his former teacher L.S. Vygotsky, he studied language disorders

Isaac ben Solomon Luria was the eponymous founder of the Lurianic school of Kabbala (Jewish esoteric mysticism). Luria’s youth was spent in Egypt, where he became versed in rabbinic studies, engaged in commerce, and eventually concentrated on study of the Zohar, the central work of Kabbala. In 1570

Ruggiero di Lauria was an Italian admiral in the service of Aragon and Sicily who won important naval victories over the French Angevins (house of Anjou) in the war between France and Aragon over the possession of Sicily in the 1280s. Lauria, who was taken from Italy about 1262, grew up at the

Salvador Luria was an Italian-born American biologist who, along with Max Delbrück and Alfred Day Hershey, won the Nobel Prize for Physiology or Medicine in 1969 for research on bacteriophages, viruses that infect bacteria. Luria graduated from the University of Turin in 1935 and became a radiology

Salvador Luria was an Italian-born American biologist who, along with Max Delbrück and Alfred Day Hershey, won the Nobel Prize for Physiology or Medicine in 1969 for research on bacteriophages, viruses that infect bacteria. Luria graduated from the University of Turin in 1935 and became a radiology

Salvador Luria was an Italian-born American biologist who, along with Max Delbrück and Alfred Day Hershey, won the Nobel Prize for Physiology or Medicine in 1969 for research on bacteriophages, viruses that infect bacteria. Luria graduated from the University of Turin in 1935 and became a radiology

Judaism: The Lurianic Kabbala: After the establishment of the Zoharic corpus, no major changes took place in Jewish esoterism until the middle of the 16th century, when a religious center of extreme importance for Judaism, mainly inspired by teachers coming from families expelled from Spain, was established…

Alison Lurie was an American writer whose urbane and witty novels usually feature upper-middle-class academics in a university setting. Lurie graduated from Radcliffe College in 1947 and later taught English and then children’s literature at Cornell University. One of her best-known books, The War

Mozambique: Drainage of Mozambique: Rivers—including the Lúrio, Ligonha, Save (Sabi), Changane, and Incomáti (Komati)—also define many of the country’s local political boundaries. Other important drainage systems include the Messalo River in the north, the Púngoè (Púnguè), Revuè, and Búzi rivers, which enter the Mozambique Channel together just south of the port…

Lorestān, geographic and historic region, western Iran. Its name means Land of the Lurs and it extends from the Iraqi frontier and Kermānshāh and separates the Khūzestān lowland from interior uplands. Extensive mountains stretch northwest–southeast; between the higher ranges are well-watered

Luristan Bronze, any of the horse trappings, utensils, weapons, jewelry, belt buckles, and ritual and votive objects of bronze probably dating from roughly 1500–500 bce that have been excavated since the late 1920s in the Harsin, Khorramābād, and Alishtar valleys of the Zagros Mountains in the

Lorca, city, Murcia provincia (province) and comunidad autónoma (autonomous community), southeastern Spain. It is situated along the Guadalentín River in a semiarid and steppelike area that is surrounded by rugged mountains. The city, which sits on both banks of the river, was the Ilurco (Ilukro)

Horace H. Lurton was an associate justice of the United States Supreme Court (1910–14). Lurton enlisted in the Confederate army at the outbreak of the war and was twice taken prisoner, but he was paroled by President Abraham Lincoln the second time upon his mother’s appeal, pleading illness. After

Horace H. Lurton was an associate justice of the United States Supreme Court (1910–14). Lurton enlisted in the Confederate army at the outbreak of the war and was twice taken prisoner, but he was paroled by President Abraham Lincoln the second time upon his mother’s appeal, pleading illness. After

Norman Foster: …developed the concept for the Lusail Stadium, the event’s centrepiece.

Norman Foster: …developed the concept for the Lusail Stadium, the event’s centrepiece.

Lusaka, city, capital of Zambia. It is situated in the south-central part of the country on a limestone plateau 4,198 feet (1,280 meters) above sea level. In the 1890s the area in which Lusaka is situated was taken over by the British South Africa Company from the local chiefs in the course of the

Angola: Independence and civil war: Eventually, an agreement called the Lusaka Accord was signed by the government and UNITA on November 20, 1994. The agreement allowed UNITA to be reintegrated into the government, provided fighting ceased on that date. Although minor fighting between the two groups continued, dos Santos and Savimbi met several times over…

Democratic Republic of the Congo: Second Congo War (1998–2003): …the provisions of the 1999 Lusaka Peace Accord, an agreement intended to end the hostilities. Although it was eventually signed by most parties involved in the conflict, the accord was not fully implemented, and fighting continued. Meanwhile, long-standing ethnic tensions between the Hema and the Lendu peoples erupted into violence…

Lusatia, central European territory of the Sorbs (Lusatians, or Wends), called Sorben (or Wenden) by the Germans. Historic Lusatia was centred on the Neisse and upper Spree rivers, in what is now eastern Germany, between the present-day cities of Cottbus (north) and Dresden (south). In the 9th

Sorbian languages, closely related West Slavic languages or dialects; their small number of speakers in eastern Germany are the survivors of a more extensive medieval language group. The centre of the Upper Sorbian speech area is Bautzen, near the border with the Czech Republic, while Cottbus, near

Lusatian Mountains, mountain group, situated in extreme northern Bohemia, Czech Republic; it is part of the Sudeten mountains (Czech: Sudety). The group extends from the Ještěd ridge in the east (3,320 feet [1,012 m]) to the gorge of the Elbe (Labe) River at Děčín in the west and also into Poland

Neisse River, either of two rivers now in southwestern Poland (until 1945, in Germany). The better-known Nysa Łużycka, or Lusatian Neisse, is the longer (157 miles [252 km]) and more westerly; it forms part of the German-Polish frontier (see Oder–Neisse Line). The Nysa Kłodzka (Glatzer Neisse), or

sprosser, species of nightingale

songbird: The nightingale of Europe (Erithacus, or Luscinia, megarhynchos), a small thrush, perhaps heads the list of famous songsters of European literature. Also a favourite of the poets was the European skylark (Alaudia arvensis). In North America the mockingbird (Mimus polyglottos) is a wonderful performer with a…

bluethroat, (Erithacus svecicus or Luscinia svecica), Eurasian chat-thrush of the thrush family, Turdidae (order Passeriformes). The bluethroat is aobut 14 centimetres (5 12 inches) long and has a bright blue throat, incorporating a crescentic spot of red or white, depending on the subspecies.

Mizo: …the Mizo groups are the Lushai (whose name is often mistakenly applied to the entire Mizo community), Pawi (Lai), Lakher (Mara), and Hmar. In the early 21st century the Mizo numbered about one million.

Mizo Hills, mountain range in southeastern Mizoram state, northeastern India, forming part of the north Arakan Yoma system. The Mizo Hills rise to about 7,000 feet (2,125 meters), and their slopes are covered with thick evergreen forest containing valuable timber and bamboo. In the intermontane

Mizoram, state of India. It is located in the northeastern part of the country and is bounded by Myanmar (Burma) to the east and south and Bangladesh to the west and by the states of Tripura to the northwest, Assam to the north, and Manipur to the northeast. The capital is Aizawl, in the

Gaohou was the first woman ruler of China, wife of Gaozu, the first emperor (reigned 206–195 bc) of the Han dynasty (206 bc–ad 220). After Gaozu’s death, his and Gaohou’s young son, the emperor Huidi (reigned 195–188 bc), ascended the throne. Gaohou, whose ambition had spurred her husband’s rise to

lüshi, a form of Chinese poetry that flourished in the Tang dynasty (618–907). It consists of eight lines of five or seven syllables, each line set down in accordance with strict tonal patterns. Exposition (qi) was called for in the first two lines; the development of the theme (cheng), in parallel

Lü Buwei: …arranged full-length book, the famous Lüshi chunqiu (“The Spring and Autumn [Annals] of Mr. Lü”), a compendium of folklore and pseudoscientific and Daoist writings.

Lüshun, former city and naval port, southern Liaoning sheng (province), northeastern China. In 1950 it was amalgamated with nearby Dalian to form the city of Lüda. In 1981, when Lüda was renamed Dalian, it became a district (under the name Lüshunkou) of the newly named

The Lusiads, epic poem by Luís de Camões, published in 1572 as Os Lusíadas. The work describes the discovery of a sea route to India by Vasco da Gama. The 10 cantos of the poem are in ottava rima and amount to 1,102 stanzas. The action of the poem begins after an introduction, an invocation, and a

The Lusiads, epic poem by Luís de Camões, published in 1572 as Os Lusíadas. The work describes the discovery of a sea route to India by Vasco da Gama. The 10 cantos of the poem are in ottava rima and amount to 1,102 stanzas. The action of the poem begins after an introduction, an invocation, and a

Lusignan Family, noble family of Poitou (a province of western France) that provided numerous crusaders and kings of Jerusalem, Cyprus, and Lesser Armenia. A branch of the family became counts of La Marche and Angoulême and played a role in precipitating the baronial revolt in England against King

Guy was the king of Jerusalem who lost that Crusader kingdom in a struggle with rival Conrad of Montferrat. In 1180 he married Sibyl, sister of the leprous Baldwin IV, king of Jerusalem. When Baldwin died in 1185, Sibyl’s son by a previous marriage, the six-year-old Baldwin V, inherited the crown

Lusitani, an Iberian people living in what is now Portugal who resisted Roman penetration in the 2nd century bc. It is uncertain to what extent the Lusitani were Celticized, though they may have been related to the Celtic Lusones of northeastern Iberia. They first clashed with the Romans in 194 bc

Lusitania, British ocean liner, the sinking of which by a German U-boat on May 7, 1915, contributed indirectly to the entry of the United States into World War I. The Lusitania, which was owned by the Cunard Line, was built to compete for the highly lucrative transatlantic passenger trade.

ancient Rome: Foreign policy: …formed: senatorial Baetica and imperial Lusitania and Tarraconensis. Three legions enforced Roman authority from Gibraltar to the mouth of the Rhine. Augustus ignored the advice of court poets and others to advance still farther and annex Britain.

Anatolia: The Old Hittite Kingdom: … (Purushkhanda; probably modern Acemhöyük); and Lusna (classical Lystra). With the exception of Landa (probably to the north), the sites are all located in the territory to the south of the Kızıl River called by the Hittites the Lower Land, suggesting the first extension of the Hittite Kingdom from its restricted…

Svan language, unwritten language spoken in the high valleys south of Mount Elbrus in the Caucasus. Svan and the Georgian, Mingrelian (Megrelian), and Laz (Chan) languages constitute the Kartvelian, or South Caucasian, language family. Svan has four dialects and differs from the other Kartvelian

India: The Portuguese: …population of Goans and other Luso-Indians along the western coast of India and in Sri Lanka and with them a lingua franca in the ports and markets. Then came Roman Catholicism, which today has millions of followers and an array of churches, convents, and colleges all over India. More tangible…

lussatite, a widespread silica mineral, the fibrous variety of low-temperature cristobalite (compare opal) that occurs with opal and chalcedony near the surface of low-temperature hydrothermal deposits. Originally found in the bitumen veins at Lussat, Fr. (whence its name), it also occurs in the

St. Lucia’s Day: In Scandinavia: … and baked goods, such as saffron bread (lussekatter) and ginger biscuits, to the other members of the family. These traditional foods are also given to visitors during the day.

Melchior Lussy was a Roman Catholic partisan and champion of the Counter-Reformation in Switzerland who was one of the most important Swiss political leaders in the latter half of the 16th century. Representative of the Catholic cantons at the Council of Trent and at the courts of four popes—Paul

lust, in Roman Catholic theology, one of the seven deadly sins. According to the Catechism of the Catholic Church, issued by the Vatican in 1992, lust is the “disordered desire for or inordinate enjoyment of sexual pleasure.” It goes on to state that “sexual pleasure is morally disordered when

Elfriede Jelinek: …Wonderful Times, 1990), Lust (1989; Lust, 1992), and Gier (2000; Greed, 2006). Her most notable plays included Was geschah, nachdem Nora ihren Mann verlassen hatte; oder, Stützen der Gesellschaften (1980; What Happened After Nora Left Her Husband; or, Pillars of Society, 1994), which she wrote as a sequel to Henrik…

Lust for Life, American film drama, released in 1956, that chronicles the life of artist Vincent van Gogh and was notable for the acclaimed performances by Kirk Douglas and Anthony Quinn. Lust for Life details the passions and frustrations of van Gogh (played by Douglas), who eventually took his

Iggy and the Stooges: …solo albums, The Idiot and Lust for Life, both produced and cowritten by Bowie in Berlin. The albums, which revealed a new maturity, were praised by critics and gave Iggy his first commercial success. He continued recording through the 1980s and ’90s, scoring hits with the new wave-influenced Blah Blah…

Irving Stone: …prominence with the publication of Lust for Life (1934), a vivid fictionalized biography of the painter Vincent Van Gogh.

Ang Lee: …subsequently directed Se, jie (2007; Lust, Caution), an erotic tale set during the Japanese occupation of Shanghai in World War II, and Taking Woodstock (2009), a comedy about a young man’s pivotal role in staging the famed Woodstock Music and Art Fair. He returned in 2012 with Life of Pi,…

Lustenau, town, western Austria, on the Rhine River, just west of Dornbirn. First mentioned in 887, it later became an imperial free city (until 1803) and passed to Austria in 1814. Lustenau is a customs station on the Swiss border. It has a well-known embroidery industry and manufactures textiles

Hans Leo Hassler: …of these songs is the Lustgarten (1601; “Pleasure Garden”), which contains the charming “Mein Gemüt ist mir verwirret.” This tune reappears in Johann Sebastian Bach’s St. Matthew Passion under the title “O Haupt voll Blut und Wunden.”

Der Struwwelpeter, illustrated collection of cautionary tales for young children, published in German as Lustige Geschichten und drollige Bilder mit fünfzehn schön kolorierten Tafeln für Kinder von 3–6 Jahren (1845; “Cheerful Stories and Funny Pictures with 15 Beautiful Colour Plates for Children

The Merry Widow, comic operetta in three acts by Hungarian composer Franz Lehár (libretto in German by Viktor Léon and Leo Stein, based upon L’Attaché d’ambassade, a comic play from 1861 by Henri Meilhac, best known as the librettist for Georges Bizet’s Carmen) that premiered at the Theater an der

Otto Nicolai: …lustigen Weiber von Windsor (The Merry Wives of Windsor), based on William Shakespeare’s comedy.

Peter Kürten: …represented a perfect example of Lustmord, or murder for pleasure. At his trial on nine counts of murder and seven counts of attempted murder, Kürten was placed in a special cage to prevent his escape. He was sentenced to death and executed by guillotine.

Ezra Pound: Development as a poet: …perfectly worded free-verse poems in Lustra. In his poetry Pound was now able to deal efficiently with a whole range of human activities and emotions, without raising his voice. The movement of the words and the images they create are no longer the secondhand borrowings of youth or apprenticeship but…

lustration, (from Latin lustratio, “purification by sacrifice”), any of various processes in ancient Greece and Rome whereby individuals or communities rid themselves of ceremonial impurity (e.g., bloodguilt, pollution incurred by contact with childbirth or with a corpse) or simply of the profane

lustre, in mineralogy, the appearance of a mineral surface in terms of its light-reflective qualities. Lustre depends upon a mineral’s refractive power, diaphaneity (degree of transparency), and structure. Variations in these properties produce different kinds of lustre, whereas variations in the

lustred glass, art glass in the Art Nouveau style. It is a delicately iridescent glass with rich colours. Lustred glass was first produced in the United States by Louis Comfort Tiffany during the late 1800s for use as windowpanes. The intention of the inventor of Tiffany lustred glass, Arthur J.

lustreware, type of pottery ware decorated with metallic lustres by techniques dating at least from the 9th century. One technique of Middle Eastern origin, which produced the famous Hispano-Moresque pottery in Spain and Italian and Spanish majolica, involved a multistaged process that produced a

Nicholas Ray: Films of the early 1950s: …noteworthy efforts, the deeply melancholic The Lusty Men (1952), in which Robert Mitchum brought his characteristic stoic grace to a memorable portrayal of a world-weary retired rodeo champion who is smitten with the underappreciated wife (Susan Hayward) of the ranch hand (Arthur Kennedy) he trains in the art of rodeo.

Maputo River, river formed by the confluence in southwestern Mozambique of the Great Usutu River (flowing from Swaziland) and the Pongola River (flowing from South Africa). From the confluence it flows about 50 miles (80 km) northeastward to enter Delagoa Bay, 14 miles (23 km) south-southeast of

Lūt Desert, desert in eastern Iran. It stretches about 200 miles (320 km) from northwest to southeast and is about 100 miles (160 km) wide. In the east rises a great massif of dunes and sand, while in the west an extensive area of high ridges is separated by wind-swept corridors. In its lowest,

lute, in music, any plucked or bowed chordophone whose strings are parallel to its belly, or soundboard, and run along a distinct neck or pole. In this sense, instruments such as the Indian sitar are classified as lutes. The violin and the Indonesian rebab are bowed lutes, and the Japanese samisen

stringed instrument: Lutes: …in the world is the lute (the word is used here to designate the family and not solely the lute of Renaissance Europe). The characteristic structure consists of an enclosed sound chamber, or resonator, with strings passing over all or part of it, and a neck along which the strings…

Andrea Solari: To this period belong the Lute Player (c. 1510) and the Portrait of Girolamo Morone (c. 1515–22), which vividly recalls the style of Hans Holbein the Younger.

keyboard instrument: Special effects: …were also equipped with a buff stop (sometimes also called a lute stop), a device that presses pieces of soft leather against one of the sets of unison strings, producing a muted, pizzicato tone.

keyboard instrument: Special effects: …type of register, called a lute stop, was first used in Germany in the 16th century and later spread to Flanders and to England, where it was added to the normal three registers on two-manual instruments. It did not have its own set of strings but, rather, plucked those of…

Gao Ming: …playwright whose sole surviving opera, Pipaji (The Lute), became the model for drama of the Ming dynasty.

ovary: Regulation of ovarian function: This is known as the luteal phase of the menstrual cycle, which lasts until the corpus luteum degenerates (luteolysis) and estradiol and progesterone production decreases. The decreasing serum estrogen and progesterone concentrations result in constriction of uterine arteries, thus interrupting the delivery of oxygen and nutrients to the endometrium. The…

ovary: Regulation of ovarian function: This is known as the luteal phase of the menstrual cycle, which lasts until the corpus luteum degenerates (luteolysis) and estradiol and progesterone production decreases. The decreasing serum estrogen and progesterone concentrations result in constriction of uterine arteries, thus interrupting the delivery of oxygen and nutrients to the endometrium. The…

Sweden: Daily life and social customs: Lutefisk (dried cod soaked in water and lye so it swells), pickled herring, lingonberries (which keep well without preservatives), knäckebröd (crispbread), and fermented or preserved dairy products such as the yogurtlike fil, the stringy långfil, and cheeses all reflect this need for foods that will…

luteinizing hormone (LH), one of two gonadotropic hormones (i.e., hormones concerned with the regulation of the gonads, or sex glands) that is produced by the pituitary gland. LH is a glycoprotein and operates in conjunction with follicle-stimulating hormone (FSH). Following the release of the egg

gonadotropin-releasing hormone (GnRH), a neurohormone consisting of 10 amino acids that is produced in the arcuate nuclei of the hypothalamus. GnRH stimulates the synthesis and secretion of the two gonadotropins—luteinizing hormone (LH) and follicle-stimulating hormone (FSH)—by the anterior

prolactin, a protein hormone produced by the pituitary gland of mammals that acts with other hormones to initiate secretion of milk by the mammary glands. On the evolutionary scale, prolactin is an ancient hormone serving multiple roles in mediating the care of progeny (sometimes called the

prolactin, a protein hormone produced by the pituitary gland of mammals that acts with other hormones to initiate secretion of milk by the mammary glands. On the evolutionary scale, prolactin is an ancient hormone serving multiple roles in mediating the care of progeny (sometimes called the

Fred Luter, Jr. is an American Protestant religious leader and was the president of the Southern Baptist Convention (2012–14), the first African American to hold the position. Luter was born in the Ninth Ward of New Orleans. He narrowly survived a motorcycle accident when he was 21 years old, an

Dosso Dossi was a late Italian Renaissance painter and leader of the Ferrarese school in the 16th century. Very little is known about his early life, and his artistic influences and training have long been open to speculation. His byname comes from the name of the family estate near his place of

Dosso Dossi was a late Italian Renaissance painter and leader of the Ferrarese school in the 16th century. Very little is known about his early life, and his artistic influences and training have long been open to speculation. His byname comes from the name of the family estate near his place of

Dosso Dossi was a late Italian Renaissance painter and leader of the Ferrarese school in the 16th century. Very little is known about his early life, and his artistic influences and training have long been open to speculation. His byname comes from the name of the family estate near his place of

Dosso Dossi was a late Italian Renaissance painter and leader of the Ferrarese school in the 16th century. Very little is known about his early life, and his artistic influences and training have long been open to speculation. His byname comes from the name of the family estate near his place of

Paris, city and capital of France, situated in the north-central part of the country. People were living on the site of the present-day city, located along the Seine River some 233 miles (375 km) upstream from the river’s mouth on the English Channel (La Manche), by about 7600 bce. The modern city

Jan van Krimpen: The typeface he produced, Lutetia (the Roman name for Paris), was the official lettering for an exhibition of Dutch art in Paris in 1927, and its reception led to his lifelong association with the firm. In addition to Lutetia, van Krimpen’s well-known faces include Antigone Greek (1927), Romanée (1928),…

Lutetian Stage, second of the four stages (in ascending order) subdividing Eocene rocks, representing all rocks deposited worldwide during the Lutetian Age (47.8 million to 41.3 million years ago) of the Paleogene Period (66 million to 23 million years ago). The name of this stage is derived from

lutetium (Lu), chemical element, a rare-earth metal of the lanthanide series of the periodic table, that is the densest and the highest-melting rare-earth element and the last member of the lanthanide series. In its pure form, lutetium metal is silvery white and stable in air. The metal is easily

lutetium: …consists of two isotopes: stable lutetium-175 (97.4 percent) and radioactive lutetium-176 (2.6 percent, 3.76 × 1010-year half-life). The radioactive isotope is used to determine the age of meteorites relative to that of Earth. In addition to lutetium-176, and not counting nuclear isomers, 33 more radioactive isotopes of lutetium are known.…

lutetium: 4 percent) and radioactive lutetium-176 (2.6 percent, 3.76 × 1010-year half-life). The radioactive isotope is used to determine the age of meteorites relative to that of Earth. In addition to lutetium-176, and not counting nuclear isomers, 33 more radioactive isotopes of lutetium are known. They range in mass from…