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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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
A welcome screen for the Free-net bulletin board, from 1994. A bulletin board system (BBS), also called a computer bulletin board service (CBBS), [1] is a computer server running software that allowed users to connect to the system using a terminal program.
It is one of 16 two-year, open-admissions colleges of the Kentucky Community and Technical College System (KCTCS). It was established in 1960 under the leadership of the late Dr. Louis C. Alderman Jr., the first Director of the Northwest Extension of the University of Kentucky.
Dysgraphia is a learning disability that can make it difficult for you or your child to write. It's different from dyslexia, though the two conditions can sometimes occur together. We explain ...
Aseptic technique is a procedure used by medical staff to prevent the spread of infection. The goal is to reach asepsis, which means an environment that is free of harmful microorganisms.
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Calcium carbonate in the form of chalk has traditionally been a major component of blackboard chalk. However, modern manufactured chalk is mostly gypsum, hydrated calcium sulfate CaSO 4 ·2H 2 O. Calcium carbonate is a main source for growing biorock.
Between 1874 and 1936, diverse federal legislation supported maritime training through school ships, internships at sea, and other methods. A disastrous fire in 1934 aboard the passenger ship SS Morro Castle, in which 134 people died, convinced the U.S. Congress that direct federal involvement in efficient and standardized training was needed.