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61POPULATION — Methodological Uncertainties Because of the great difficulties in ascertaining human population data in general, and Jewish data in particular, especially in ancient and medieval times, a word of caution is even more necessary here than in most… …
62American middle class — The American middle class is a social class in the United States.[1][2] While the concept is typically ambiguous in popular opinion and common language use,[3] contemporary social scientists have put forward several, more or less congruent,… …
63ECONOMIC HISTORY — This article is arranged according to the following outline: first temple period exile and restoration second temple period talmudic era muslim middle ages medieval christendom economic doctrines early modern period sephardim and ashkenazim… …
64NEW YORK CITY — NEW YORK CITY, foremost city of the Western Hemisphere and largest urban Jewish community in history; pop. 7,771,730 (1970), est. Jewish pop. 1,836,000 (1968); metropolitan area 11,448,480 (1970), metropolitan area Jewish (1968), 2,381,000… …
65Item response theory — In psychometrics, item response theory (IRT) is a body of theory describing the application of mathematical models to data from questionnaires and tests as a basis for measuring abilities, attitudes, or other variables. It is used for statistical …
66Body fat percentage — A person s body mass percentage is the total weight of the person s fat divided by the person s weight and consists of essential body fat and storage body fat. Essential body fat is necessary to maintain life and reproductive functions. The… …
67China — This article is about the People s Republic of China. For the state commonly known as Taiwan, see the Republic of China. For other uses, see China (disambiguation). PRC redirects here. For other uses, see PRC (disambiguation). People …
68New Orleans — The Big Easy and NOLA redirect here. For other uses, see The Big Easy (disambiguation) and NOLA (disambiguation). This article is about the city. For other uses, see New Orleans (disambiguation). City of New Orleans Ville de La Nou …
69Project Sign — was an official U.S. government study of unidentified flying objects (UFOs) undertaken by the United States Air Force in late 1947 and dissolved in late 1948. Formally, Project Sign came to no conclusion about UFOs [see Blum, Howard, Out There:… …
70List of dwarf planet candidates — At present, the International Astronomical Union classifies five objects as dwarf planets: Ceres, Pluto, Eris, Haumea, and Makemake, though dozens of others are thought likely to be classified as such in the future. The qualifying feature of… …
