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carbon dating, carbon-14 dating, radiocarbon dating - a chemical analysis used to determine the age of organic materials based on their content of the radioisotope carbon-14; believed to be reliable up to 40,000 years from the times of the surgeon who was Jekyll's predecessor; but even as they opened the door they were advertised of the uselessness of further search, by the fall of a perfect mat of cobweb which had for years sealed up the entrance.from a particular hour, his resumption of his campaign after a diplomatic drop, a calculated absence of three nights - of his being definitely followed, tracked at a distance carefully taken and to the express end that he should the less confidently, less arrogantly, appear to himself merely to pursue.The number of fission tracks is directly proportional to the time since the material cooled from a molten state.Arc flash is currently one of the least understood hazards associated with electricity.Much of the relative geologic time scale had been constructed prior to the 20th century, but much progress has been made in the last half-century toward defining the absolute ages of the rocks on which the relative time scale is based.

For more information, see the latest announcement from the NBER's Business Cycle Dating Committee, dated 9/20/10.June 1857(II) October 1860(III) April 1865(I) June 1869(II) October 1873(III) March 1882(I) March 1887(II) July 1890(III) January 1893(I) December 1895(IV) June 1899(III) September 1902(IV) May 1907(II) January 1910(I) January 1913(I) August 1918(III) January 1920(I) May 1923(II) October 1926(III) August 1929(III) May 1937(II) February 1945(I) November 1948(IV) July 1953(II) August 1957(III) April 1960(II) December 1969(IV) November 1973(IV) January 1980(I) July 1981(III) July 1990(III) March 2001(I) December 2007 (IV) December 1854 (IV) December 1858 (IV) June 1861 (III) December 1867 (I) December 1870 (IV) March 1879 (I) May 1885 (II) April 1888 (I) May 1891 (II) June 1894 (II) June 1897 (II) December 1900 (IV) August 1904 (III) June 1908 (II) January 1912 (IV) December 1914 (IV) March 1919 (I) July 1921 (III) July 1924 (III) November 1927 (IV) March 1933 (I) June 1938 (II) October 1945 (IV) October 1949 (IV) May 1954 (II) April 1958 (II) February 1961 (I) November 1970 (IV) March 1975 (I) July 1980 (III) November 1982 (IV) March 1991(I) November 2001 (IV) June 2009 (II) Other Related Press Releases: April 12, 2010 January 7, 2008 October 21, 2003 December 21, 1990 December 31, 1979 October 25, 1979 July 27, 1979 Prior to 1979, there were no formal announcements of business cycle turning points.The NBER does not define a recession in terms of two consecutive quarters of decline in real GDP.In order to make a more useful and practical time-scale the Ordovician has been sub-divided into distinctive, well-defined intervals of time often referred to as series and stages.Within the context of the Phanerozoic Eon, geologists beginning in the late 1700's recognized that fossils appeared in an orderly fashion in stratigraphic units.