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61Metallography — A micrograph of bronze revealing a cast dendritic structure Metallography is the study of the physical structure and components of metals, typically using microscopy. Ceramic and polymeric materials may also be prepared using metallographic… …
62Milky Way Galaxy — Large spiral galaxy (roughly 150,000 light years in diameter) that contains Earth s solar system. It includes the multitude of stars whose light is seen as the Milky Way, the irregular luminous band that encircles the sky defining the plane of… …
63hydrologic sciences — Introduction the fields of study concerned with the waters of the Earth. Included are the sciences of hydrology, oceanography, limnology, and glaciology. In its widest sense hydrology encompasses the study of the occurrence, the… …
64number game — Introduction any of various puzzles and games that involve aspects of mathematics. Mathematical recreations comprise puzzles and games that vary from naive amusements to sophisticated problems, some of which have never been solved.… …
65HAGGADAH, PASSOVER — (Heb. הַגָּדָה; telling ), a set form of benedictions, prayers, midrashic comments and psalms recited at the seder ritual on the eve of passover . INTRODUCTION The Haggadah is based on the seder service prescribed by the Mishnah (Pes. 10),… …
66Worldbuilding — A rendered conworld, as would be seen from space by an observer. Worldbuilding is the process of constructing an imaginary world, sometimes associated with a fictional universe. The result may sometimes be called a constructed world,[1] conworld… …
67North American English regional phonology — See also: Regional vocabularies of American English North American English regional phonology is the study of variations in the pronunciation of spoken English by the inhabitants of various parts of North America. North American English can be… …
68Mechanical explanations of gravitation — (or kinetic theories of gravitation) are attempts to explain the action of gravity by aid of basic mechanical processes, such as pressure forces caused by pushes, and without the use of any action at a distance. These theories were developed from …
69Ordnance Survey — Welsh: Arolwg Ordnans Non ministerial government department overview Formed 1791 ( …
70biology — /buy ol euh jee/, n. 1. the science of life or living matter in all its forms and phenomena, esp. with reference to origin, growth, reproduction, structure, and behavior. 2. the living organisms of a region: the biology of Pennsylvania. 3. the… …
