Harp

The harp is a stringed musical instrument which has a number of individual strings running at an angle to its soundboard, which are plucked with the fingers. Harps have been known since antiquity in Asia, Africa, and Europe, dating back at least as early as 3500 BCE. The instrument had great popularity in Europe during the Middle Ages and Renaissance, where it evolved into a wide variety of variants with new technologies, and was disseminated to Europe's colonies, finding particular popularity in Latin America. While some ancient members of the harp family died out in the Near East and South Asia, descendants of early harps are still played in Burma and in Sub-Saharan Africa, while other defunct variants in Europe and Asia have been revived by musicians in the modern era.

Harps vary globally in many ways. In terms of size, many smaller harps can be played on the lap, while larger harps are quite heavy and rest on the floor. Different harps may use strings of catgut or nylon, or of metal, or some combination. While all harps have a neck, resonator, and strings, "frame harps" have a pillar at their long end to support the strings, while "open harps", such as arch or bow harps, do not. Modern harps also vary in techniques used to extend the range and chromaticity of the strings, such as adjusting a string's note mid-performance with levers or pedals which modify the pitch.

Gold

Gold is a chemical element with symbol Au (from Latin: aurum) and atomic number 79. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable and ductile metal. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements, and is solid under standard conditions. The metal therefore occurs often in free elemental (native) form, as nuggets or grains, in rocks, in veins and in alluvial deposits. It occurs in a solid solution series with the native element silver (as electrum) and also naturally alloyed with copper and palladium. Less commonly, it occurs in minerals as gold compounds, often with tellurium (gold tellurides).

Gold's atomic number of 79 makes it one of the higher atomic number elements that occur naturally in the universe. It is thought to have been produced in supernova nucleosynthesis from the collision of two neutron stars and to have been present in the dust from which the Solar System formed. Because the Earth was molten when it was just formed, almost all of the gold present in the early Earth probably sank into the planetary core. Therefore, most of the gold that is present today in the Earth's crust and mantle is thought to have been delivered to Earth later, by asteroid impacts during the late heavy bombardment, about 4 billion years ago.

Mathematics

Mathematics (from Greek μάθημα máthēma, “knowledge, study, learning”) is the study of topics such as quantity (numbers),structure,space, and change. There is a range of views among mathematicians and philosophers as to the exact scope and definition of mathematics.

Mathematicians seek out patterns and use them to formulate new conjectures. Mathematicians resolve the truth or falsity of conjectures by mathematical proof. When mathematical structures are good models of real phenomena, then mathematical reasoning can provide insight or predictions about nature. Through the use of abstraction and logic, mathematics developed from counting, calculation, measurement, and the systematic study of the shapes and motions of physical objects. Practical mathematics has been a human activity for as far back as written records exist. The research required to solve mathematical problems can take years or even centuries of sustained inquiry.

Rigorous arguments first appeared in Greek mathematics, most notably in Euclid's Elements. Since the pioneering work of Giuseppe Peano (1858–1932), David Hilbert (1862–1943), and others on axiomatic systems in the late 19th century, it has become customary to view mathematical research as establishing truth by rigorous deduction from appropriately chosen axioms and definitions. Mathematics developed at a relatively slow pace until the Renaissance, when mathematical innovations interacting with new scientific discoveries led to a rapid increase in the rate of mathematical discovery that has continued to the present day.

James Horner

James Roy Horner (August 14, 1953 – June 22, 2015) was an Oscar-winning American composer, conductor and orchestrator of film scores. He was known for the integration of choral and electronic elements in many of his film scores, and for his frequent use of motifs associated with Celtic music.

His first major film score was for the 1979 film The Lady in Red, but did not establish himself as a mainstream composer until he worked on the 1982 film Star Trek II: The Wrath of Khan. Horner's score for Titanic is the best-selling orchestral film soundtrack of all time, with his work on Titanic and Avatar, both directed by James Cameron, contributing to the first two films to achieve a $2 billion box office.

Horner collaborated on multiple projects with directors including Don Bluth, James Cameron, Joe Johnston, Walter Hill and Ron Howard; producers including David Kirschner, Jon Landau, Brian Grazer and Steven Spielberg; and songwriters including Will Jennings, Barry Mann and Cynthia Weil. Horner composed music for over 100 films; he won two Academy Awards, two Golden Globe Awards, three Satellite Awards, and three Saturn Awards, and was nominated for three British Academy Film Awards.

White Gold

White gold is an alloy of gold and at least one white metal, usually nickel, manganese or palladium. In order to make the gold white, it is combined with metal alloys that are white in nature and plated with an extremely hard element called rhodium. Although strong, rhodium may wear away over time. Replating is a simple process that can be done to restore whiteness to rhodium-plated jewelry.

White gold may also refer to:

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