History
The index was introduced by Raymond Pearl in 1933. It has remained popular for over seventy years, in large part because of the simplicity of the calculation.
Read more about this topic: Pearl Index
Famous quotes containing the word history:
“He wrote in prison, not a History of the World, like Raleigh, but an American book which I think will live longer than that. I do not know of such words, uttered under such circumstances, and so copiously withal, in Roman or English or any history.”
—Henry David Thoreau (1817–1862)
“We know only a single science, the science of history. One can look at history from two sides and divide it into the history of nature and the history of men. However, the two sides are not to be divided off; as long as men exist the history of nature and the history of men are mutually conditioned.”
—Karl Marx (1818–1883)
“The greatest honor history can bestow is that of peacemaker.”
—Richard M. Nixon (1913–1995)