Civil Rights
Movements, leaders, victories and the continuing fight for equality.
Explore the people, places, events, achievements, struggles and stories that shaped our journey.
Movements, leaders, victories and the continuing fight for equality.
Innovation, patents, science, technology and world-changing contributions.
Pioneers, champions, Negro Leagues, records, activism and excellence.
Meet the people whose lives, choices and achievements shaped the journey.
Black towns, communities, institutions and places where history happened.
Moments that changed communities, movements, institutions and the nation.
Katherine Johnson’s mathematical calculations helped guide some of America’s most important early space missions while she confronted the racial and gender barriers faced by Black women in twentieth-century America.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
CRAC might refer to:
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CRAC might refer to: The CRAC-II "Calculation of Reactor Accident Consequences" study A castle, as in Krak des Chevaliers A Computer Room Air Conditioner Clube Recreativo e Atlético Catalano, a Brazilian football (soccer) club commonly known as CRAC Clube Recreativo Atlético Campoverdense, a Brazilian football (soccer) club commonly known as CRAC Crac, a 1981 Oscar-winning animated short film Calcium Release Activated Channels, ion channels in cell membrane Closed Reduction And Cast, an orthopaedic surgical procedure
Crac is a 1981 animated short film produced, written and directed by Frédéric Back.
Crac! is the third album of the jazz fusion band Area and was released in 1975. With this album, the band gained more popularity in Italy, thanks to songs like "L'elefante Bianco", "La Mela di Odessa (1920)" and "Gioia e Rivoluzione", which quickly became concert favourites. All songs were written by Tofani, Fariselli and Tavolazzi, except for "Area 5" which was written by Juan Hidalgo and Walter Marchetti. When touring for this album the band even played in Paris and in Lisboa (as documented posthumously in the album "Parigi Lisbona" released in 1976, while a live album from their Italian tour was released later that year).
CRAC-II is both a computer code (titled Calculation of Reactor Accident Consequences) and the 1982 report of the simulation results performed by Sandia National Laboratories for the Nuclear Regulatory Commission. The report is sometimes referred to as the CRAC-II report because it is the computer program used in the calculations, but the report is also known as the 1982 Sandia Siting Study or as NUREG/CR-2239. The computer program MACCS2 has since replaced CRAC-II for the consequences of radioactive release. CRAC-II has been declared to be obsolete and will be replaced by the State-of-the-Art Reactor Consequence Analyses study. The CRAC-II simulations calculated the possible consequences of a worst-case accident under worst-case conditions (a so-called "class-9 accident") for several different U.S. nuclear power plants. In the Sandia Siting Study, the Indian Point Energy Center was calculated to have the largest possible consequences for an SST1 (spectrum of source terms) release, with estimated maximum possible casualty numbers of around 50,000 deaths, 150,000 injuries, and property damage of $274 Billion to $314 Billion (based on figures at the time of the report in 1982). The Sandia Siting Study, however, is commonly misused as a risk analysis, which it is not. It is a sensitivity analysis of different amounts of radioactive releases and an SST1 release is now generally considered not a credible accident (see below). Another significant report is the 1991 NUREG-1150 calculations, which is a more-rigorous risk assessment of five U.S. Nuclear Power Plants.
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →Mae Jemison, aboard Space Shuttle Endeavour in 1992.