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The notion of the wisdom of the multitude was lost, and then redescoverd by [http://en.wikipedia.org/wiki/Francis_Galton Francis Galton]<ref>[http://galton.org/essays/1900-1911/galton-1907-vox-populi.pdf?page=7 Galton, F. (1907). Vox Populi. Nature, 75(1949), 450–451. doi:10.1038/075450a0]</ref>. Galton accidently discovered this property, when he participated in a fair, in which the crowed was asked to estimate the wight of an ox. About 800 tickets were issued and after the end of the game, Galton had taken these tickets, and caculated the mean of the estimations. he found out the the mean of all estimations was very close to the real wight of the ox. The ox wighted 1207 lb (547.48 kg), where as the mean was 1198 lbs (543.40kg).
Another showed that the crowed that shifts his mind, due to experts, may cause bias, while the unmoved part is the more wise and accurate<ref>2014, Forget the Wisdom of Crowds; Neurobiologists Reveal the Wisdom of the Confident</ref>.