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It is an odd but indisputable fact that the seventeenth-century English women who are generally regarded as among the forerunners of modern feminism are almost all identified with ... [更多详细]
发布日期:2015-11-23
A small number of the forest species of lepidoptera (moths and butterflies, which exist as caterpillars during most of their life cycle) exhibit regularly recurring patterns of pop ... [更多详细]
发布日期:2015-11-23
Scientists long believed that two nerve clusters in the human hypothalamus, called suprachiasmatic nuclei (SCNs), were what controlled our circadian rhythms. Those rhythms are the ... [更多详细]
发布日期:2015-11-23
Some observers have attributed the dramatic growth in temporary employment that occurred in the United States during the 1980s to increased participation in the ... [更多详细]
发布日期:2015-08-11
In 1988 services moved ahead of manufacturing as the main product of the United States economy. But what is meant by "services" ? Some economists define a serv ... [更多详细]
发布日期:2015-08-11
Manufacturers have to do more than build large manufacturing plants to realize economies of scale.It is true that as the capacity of a manufacturing operation ... [更多详细]
发布日期:2015-08-11
Current feminist theory, in validating women’s own stories of their experience, has encouraged scholars of women’s history to view the use of women ... [更多详细]
发布日期:2015-08-11
Frazier and Mosteller assert that medical research could be improved by a move toward larger, simpler clinical trials of medical treatments. Currently, researc ... [更多详细]
发布日期:2015-08-11
In Winters v. United States (1908), the Supreme Court held that the right to use waters flowing through or adjacent to the Fort Belknap Indian Reservation was ... [更多详细]
发布日期:2015-08-11
After evidence was obtained in the 1920s that the universe is expanding, it became reasonable to ask: Will the universe continue to expand indefinitely, or is ... [更多详细]
发布日期:2015-08-11
Two works published in 1984 demonstrate contrasting approaches to writing the history of United States women. Buel and Buel’s biography of Mary Fish (173 ... [更多详细]
发布日期:2015-08-11
In terrestrial environments, gravity places special demands on the cardiovascular systems of animals. Gravitational pressure can cause blood to pool in the low ... [更多详细]
发布日期:2015-08-11
Jon Clark’s study of the effect of the modernization of a telephone exchange on exchange maintenance work and workers is a solid contribution to a debate ... [更多详细]
发布日期:2015-08-11
Biologists have advanced two theories to explain why schooling of fish occurs in so many fish species. Because schooling is particularly widespread among speci ... [更多详细]
发布日期:2015-08-10
Io and Europa, the inner two of Jupiter's four largest moons, are about the size of Earth's moon and are composed mostly or entirely of rock and metal. Ganym ... [更多详细]
发布日期:2015-08-10
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