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William David Ross and Michael Vickers
Abacus (ἄβαξ, ἀβάκιον), a counting-board, the usual aid to reckoning in antiquity. The Egyptians, Greeks, and Romans alike used a board with vertical columns, on which (working from right to left) units, tens, hundreds, or (where money was in question) e.g. ⅛ obols, ¼ obols, ½ obols, obols, drachmae, sums of 10, 100, 1,000 drachmae, and talents were inscribed. When an addition sum was done, the totals of the columns were carried to the left, as in our ordinary addition. The numbers might be marked in writing or by pebbles, counters, or pegs.
Alan H. Griffiths
Jean K. Quam
Edith Abbott (1876–1957) was a social worker and educator. She was Dean of the School of Social Service Administration at the University of Chicago from 1924 to 1942 and she helped in drafting the Social Security Act of 1935.
Jean K. Quam
Grace Abbott (1878–1939) was a teacher who went on to become Director of the Immigrants Protective League of Chicago and Director of the U.S. Children's Bureau. In 1934 she became professor of public welfare at the University of Chicago.
Ellen A. Wartella, Alexis R. Lauricella, Leanne Beaudoin-Ryan, and Drew P. Cingel
This is an advance summary of a forthcoming article in the Oxford Research Encyclopedia of Communication. Please check back later for the full article.
Children are and have been active media users for decades. Historically, the focus on children and media issues have centered on the concerns and consequences of media use, generally around violence. In the last 40 years, we have seen a shift to study children and media from a more holistic approach, to understand both the positive and negative relationships between children and media use. Further, the recognition of the very important developmental differences that exist between children of different ages and the use of grand developmental theories, including those by Piaget and Vygotsky, have supported the field’s understanding of the unique ways in which children use media and the effects it has on their lives. Three important constructs related to a more complete understanding of children’s media use are the ABCs (attention, behavior, and comprehension). The first construct, attention, focuses on the way in which children’s attention to screen media develops, how factors related to parents and children can direct or influence attention to media, and how media may distract attention. The second construct is the behavioral effect of media use, including the relationship between media use and aggressive behavior, but importantly, the positive effect of prosocial media on children’s behavior and moral development. Finally, the third construct is the important and dynamic relationship between media and comprehension and learning. Taken together, these constructs describe a wide range of experiences that occur within children’s media use.
James Maxwell Ross Cormack and Nicholas Geoffrey Lemprière Hammond
Lou M. Beasley
Ralph David Abernathy (1926–1980) was a pastor who became president of the Southern Christian Leadership Conference after the assassination of Martin Luther King. He was director of personnel, dean of men, and professor of social studies at Alabama State University.
D. Lynn Jackson
Until the 19th century, abortion law was nonexistent and abortion was not seen as a moral issue. However, by the turn of the 20th century, abortion was legally defined and controlled in most states. The landmark Supreme Court case, Roe v. Wade (1973), marked the legalization of abortion but did not end the controversy that existed. Legislation at both the federal and state levels has added restrictions on abortion, making it difficult for women to exercise their reproductive rights. Social work's commitment to promote the human rights of women compels social workers to be aware of and involved in this issue.
Was the best harbour on the Asiatic side of the *Hellespont. In the Iliad (2. 836) an ally of Troy and then a Thracian settlement, it was colonized c.700