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11Optigan — Keyboard overview of a model 35002 Optigan. The coded strip above the main keyboard corresponded to numbers in the music books for those unable to read music. The Optigan (a portmanteau of Optical Organ) was an electronic keyboard instrument… …
12interior design — 1. the design and coordination of the decorative elements of the interior of a house, apartment, office, or other structural space, including color schemes, fittings, furnishings, and sometimes architectural features. 2. the art, business, or… …
13Sundial — A sundial is a device that measures time by the position of the Sun. In common designs such as the horizontal sundial, the sun casts a shadow from its style (a thin rod or a sharp, straight edge) onto a flat surface marked with lines indicating… …
14Glossary of rail terminology — Rail transport Operations Track Maintenance High speed Gauge Stations …
15ATX — This article is about the computer form factor. For other uses, see ATX (disambiguation). ATX motherboard. Computer form factors Name PCB size (mm) …
16Stack (data structure) — In computer science, a stack is an abstract data type and data structure based on the principle of Last In First Out (LIFO) . Stacks are used extensively at every level of a modern computer system. For example, a modern PC uses stacks at the… …
17pre-Columbian civilizations — Introduction the aboriginal American Indian (Mesoamerican Indian) cultures that evolved in Meso America (part of Mexico and Central America) and the Andean region (western South America) prior to Spanish exploration and conquest in the 16th …
182010 Haiti earthquake — 2010 Haiti earthquake …
19Matte (filmmaking) — For the technique of creating backgrounds, see matte painting. For other uses, see Matte (disambiguation). Mattes are used in photography and special effects filmmaking to combine two or more image elements into a single, final image. Usually,… …
20Mexico — /mek si koh /, n. 1. a republic in S North America. 97,563,374; 761,530 sq. mi. (1,972,363 sq. km). Cap.: Mexico City. 2. a state in central Mexico. 6,245,000; 8268 sq. mi. (21,415 sq. km). Cap.: Toluca. 3. Gulf of, Mexican, Golfo de México /gawl …
