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Uses. Reusable writing surface on which text or drawings are made. A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
Gene Kranz. Eugene Francis Kranz (born August 17, 1933) is an American aerospace engineer who served as NASA 's second Chief Flight Director, directing missions of the Mercury, Gemini and Apollo programs, including the first lunar landing mission, Apollo 11. He directed the successful efforts by the Mission Control team to save the crew of ...
2. Request PMI cancellation when mortgage balance reaches 80 percent. Another way the PMI Cancellation Act benefits you is by granting you the right to remove PMI once you have reached 20 percent ...
Alstonia scholaris, commonly called blackboard tree, scholar tree, milkwood or devil's tree in English, is an evergreen tropical tree in the Dogbane Family (Apocynaceae). It is native to southern China, tropical Asia (mainly the Indian subcontinent and Southeast Asia ) and Australasia , where it is a common ornamental plant .
Chalkboard scraping. Scraping a chalkboard (also known as a blackboard) with one's fingernails produces a sound and feeling which most people find extremely irritating. The basis of the innate reaction to the sound has been studied in the field of psychoacoustics (the branch of psychology concerned with the perception of sound and its ...
ISM's Purchasing Managers Index 1948–2012. Purchasing managers' indexes (PMI) are economic indicators derived from monthly surveys of private sector companies.. The three principal producers of PMIs are the Institute for Supply Management (ISM), which originated the manufacturing and non-manufacturing metrics produced for the United States, the Singapore Institute of Purchasing and Materials ...
Budget. $500,000. Massacre at Central High (released as Blackboard Massacre in the UK) is a 1976 American thriller film directed by Rene Daalder and starring Derrel Maury, Kimberly Beck, Robert Carradine, and Andrew Stevens. The plot follows a series of revenge killings at a fictional American high school, after which the oppressed students ...
Post-mortem phenomena to estimate the time of death. The post-mortem interval ( PMI) is the time that has elapsed since an individual's death. [1] When the time of death is not known, the interval may be estimated, and so an approximate time of death established. Postmortem interval estimations can range from hours, to days or even years ...