slope detection
81Battle of Gettysburg, Second Day — ] During the Second Day of the Battle of Gettysburg, on July 2, 1863, Confederate General Robert E. Lee attempted to capitalize on his first day s success. He launched the Army of Northern Virginia in multiple attacks against the flanks of the… …
82Sensory illusions in aviation — Because human senses are adapted for use on the ground, navigating by sensory input alone during flight can be dangerous: sensory input does not always accurately reflect the movement of the aircraft, causing sensory illusions. These illusions… …
83Portuguese dogfish — Conservation status …
84Evidence regarding Bigfoot — Infobox Pseudoscience topics=Zoology claims=There exists a great ape native to North America which has evaded detection in remote areas of the Pacific Northwest and other regions of North America, in contrast to the mainstream view that no such… …
85SimCity (series) — SimCity is an open ended city building computer and console video game series and the brainchild of developer Will Wright. It is published by Maxis (now a division of Electronic Arts). The game was first published in 1989 as SimCity , it has… …
86Sand — For other uses, see Sand (disambiguation). Close up of sand from the Gobi Desert, Mongolia, showing a surface area of 1 square centimetres …
87Porosity — or void fraction is a measure of the void (i.e., empty ) spaces in a material, and is a fraction of the volume of voids over the total volume, between 0–1, or as a percentage between 0–100%. The term is used in multiple fields including… …
88earthquake — /errth kwayk /, n. 1. a series of vibrations induced in the earth s crust by the abrupt rupture and rebound of rocks in which elastic strain has been slowly accumulating. 2. something that is severely disruptive; upheaval. [1300 50; ME erthequake …
89galaxy — /gal euhk see/, n., pl. galaxies. 1. Astron. a. a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. b. (usually cap.) See Milky Way. 2. any large and brilliant or impressive… …
90operations research — the analysis, usually involving mathematical treatment, of a process, problem, or operation to determine its purpose and effectiveness and to gain maximum efficiency. [1940 45, Amer.] * * * Application of scientific methods to management and… …
