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:
“These anyway might think it was important
That human history should not be shortened.”
—Robert Frost (1874–1963)
“America is the only nation in history which miraculously has gone directly from barbarism to degeneration without the usual interval of civilization.”
—Georges Clemenceau (1841–1929)
“A man will not need to study history to find out what is best for his own culture.”
—Henry David Thoreau (1817–1862)