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81Orbital resonance — For the science fiction novel by John Barnes, see Orbital Resonance (novel). In celestial mechanics, an orbital resonance occurs when two orbiting bodies exert a regular, periodic gravitational influence on each other, usually due to their… …
82Gentrification — and urban gentrification refer to the changes that result when wealthier people ( gentry ) acquire or rent property in low income and working class communities.[1] Urban gentrification is associated with movement. Consequent to gentrification,… …
83Vaporware — This article is about a computer industry term regarding product releases. For the company, see VaporWare (company). The U.S. Justice Department accused IBM of announcing its System/360 Model 91 computer (pictured) three years early intentionally …
84Gibson Les Paul — Infobox Guitar model|title=Gibson Les Paul caption=2005 Gibson 58 Reissue Les Paul in Heritage Cherry Sunburst manufacturer=Gibson period= 1952 1960, 1968 present bodytype=Solid necktype=Set scale=24.75 woodbody=Mahogany, Maple woodneck=Mahogany… …
85Elk State Park — Geobox Protected Area name = Elk State Park native name = other name = other name1 = category local = Pennsylvania State Park category iucn = III image caption = The East Branch Clarion River Lake at Elk State Park etymology type = Named for… …
86Sinnemahoning State Park — Geobox Protected Area name = Sinnemahoning State Park native name = other name = other name1 = category local = Pennsylvania State Park category iucn = III image caption = A view from Sinnemahoning State Park etymology type = etymology = country …
87Automobile — For the magazine, see Automobile Magazine. Car and Cars redirect here. For other uses, see Car (disambiguation). Automobile …
88Robert Mugabe — Mugabe redirects here. For other uses, see Mugabe (disambiguation). Robert Mugabe …
892000s (decade) — …
90California Gold Rush — The California Gold Rush (1848 ndash;1855) began on January 24, 1848, when gold was discovered by James Marshall at Sutter s Mill in Coloma, California. [E] vents from January 1848 through December 1855 [are] generally acknowledged as the Gold… …
