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This article includes a list of references, but its sources remain unclear because it has insufficient inline citations . Please help to improve this article by introducing more precise citations. (November 2014) (Learn how and when to remove this template message) The Westermarck effect , or reverse sexual imprinting, is a hypothetical psychological effect through which people who live in close domestic proximity during the first few years of their lives become desensitized to sexual attraction. This phenomenon was first hypothesized by Finnish anthropologist Edvard Westermarck in his book The History of Human Marriage (1891) as one explanation for the incest taboo. Observations interpreted as evidence for the Westermarck effect have since been made in many places and cultures, including in the Israeli kibbutz system, and the Chinese Shim-pua marriage customs, as well as in biologically-related families. In the case of the Israeli kibbutzim (collective farms), children...

In road bicycle racing, a Grand Tour is one of the three major European professional cycling stage races: Tour de France, Giro d'Italia and Vuelta a España. Collectively they are termed the Grand Tours , and all three races are similar in format being multi-week races with daily stages. They have a special status in the UCI regulations: more points for the UCI World Tour are distributed in Grand Tours than in other races, [1] and they are the only stage races allowed to last longer than 14 days. [2] The Giro d'Italia is generally run in May, the Tour de France in July, and the Vuelta a España in late August and September. The Vuelta was originally held in the spring, usually late April, with a few editions held in June in the 1940s. In 1995, however, the race moved to September to avoid direct competition with the Giro d'Italia, held in May. The Tour de France is the oldest and most prestigious in terms of points accrued to racers of all three, [1] , and is the most...

Elections in Pennsylvania Federal government U.S. President 1789 1792 1796 1800 1804 1808 1812 1816 1820 1824 1828 1832 1836 1840 1844 1848 1852 1856 1860 1864 1868 1872 1876 1880 1884 1888 1892 1896 1900 1904 1908 1912 1916 1920 1924 1928 1932 1936 1940 1944 1948 1952 1956 1960 1964 1968 1972 1976 1980 1984 1988 1992 1996 2000 2004 2008 2012 2016 2020 U.S. Senate Class One 1788 1791 1793 1794 1797 1802 1808 February 1814 1814 1820-21 1826 1831 1832-33 1840 1845 1851 1857 1861 1863 1869 1875 1881 1887 1893 1901 1905 1909 1911 1916 1922 1928 1934 1940 1946 1952 1958 1964 1970 1976 1982 1988 1991 1994 2000 2006 2012 2018 Class Three 1788 1795 1801 December 1801 1806 1812 1818 1824–25 1830 1834 1836 1843 1845 1849 1856 1861 1867 1873 1877 1879 1885 1891 1897 1903 1909 1914 1920 1922 1926 1930 1932 1938 1944 1950 1956 196...