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121Population inversion — In physics, specifically statistical mechanics, a population inversion occurs when a system (such as a group of atoms or molecules) exists in state with more members in an excited state than in lower energy states. The concept is of fundamental… …
122Steven Spielberg — Infobox Actor caption = Spielberg speaking at the Pentagon on August 11, 1999. birthdate = birth date and age|mf=yes|1946|12|18 birthplace = Cincinnati, Ohio, United States birthname = Steven Allan Spielberg spouse = Amy Irving (1985 1989) Kate… …
123W. H. Auden — Infobox Person image size = 144 caption = U.S. Library of Congress birth date = #ifeq:yes|yes|2|2 21 1907 birth place = York, England death date = #ifeq:yes|yes|9|9 29 1973 (aged age at date | 1907 | 2 | 21 | 1973 | 9 | 29 ) death place = Vienna …
124Isotope separation — is the process of concentrating specific isotopes of a chemical element by removing other isotopes, for example separating natural uranium into enriched uranium and depleted uranium. This is a crucial process in the manufacture of uranium fuel… …
125Access control — is the ability to permit or deny the use of a particular resource by a particular entity. Access control mechanisms can be used in managing physical resources (such as a movie theater, to which only ticketholders should be admitted), logical… …
126The Raven — is a narrative poem by the American writer Edgar Allan Poe, first published in January 1845. It is noted for its musicality, stylized language, and supernatural atmosphere. It tells of a talking raven s mysterious visit to a distraught lover,… …
127William James — Infobox Philosopher region = Western Philosophy and Psychology era = 19th/20th century philosophy color = #B0C4DE image caption = name = William James birth = January 11, 1842 New York City, New York death = August 26, 1910 (aged 68) Chocorua,… …
128Very Large Telescope — VLT redirects here. For other uses, see VLT (disambiguation). Very Large Telescope The four Unit Telescopes that form the VLT together with th …
