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71Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… …
72dating — I In geology and archaeology, the process of determining an object s or event s place within a chronological scheme. Scientists may use either relative dating, in which items are sequenced on the basis of stratigraphic clues (see stratigraphy) or …
73Egypt, ancient — Introduction civilization in northeastern Africa dating from the 3rd millennium BC. Its many achievements, preserved in its art and monuments, hold a fascination that continues to grow as archaeological finds expose its secrets. This article… …
74surface analysis — ▪ chemistry Introduction in analytical chemistry (chemistry), the study of that part of a solid that is in contact with a gas or a vacuum. When two phases of matter are in contact, they form an interface. The term surface is usually… …
75Blas Valera — was born in Chachapoyas in 1545. Although the author of the Comentarios Reales de los Incas believed that Valera was born in Cajamarca, it is proved that he was born in the city of Chachapoyas. Valera is considered to be the son of Luis Valera,… …
76Geography and the Church — • Explains the nature of this science and the course of its evolution Catholic Encyclopedia. Kevin Knight. 2006. Geography and the Church Geography and the Church …
77Library — Reading room redirects here. For other uses, see Reading room (disambiguation). For other uses, see Library (disambiguation). Reading room of the library at the University of Graz, in Austria …
78Check verification service — A check verification service provides businesses or individuals with either the ability to check the validity of the actual check or draft being presented, or the ability to verify the history of the account holder, or both.[1][2] it often… …
79Roman Historical Institutes — are collegiate bodies established at Rome, for the purpose of historical research, notably in the Vatican archives. These have been set both by ecclesiastical authority, and by national governments. Opening of the Vatican archivesIn the fifteenth …
80Masonry (Freemasonry) — Masonry (Freemasonry) † Catholic Encyclopedia ► Masonry (Freemasonry) The subject is treated under the following heads: I. Name and Definition; II. Origin and Early History; III. Fundamental Principles and Spirit; IV.… …
