See his Astounding Days: A Science Fictional Autobiography (1990); biography by N. McAleer (1992); study by J. D. Olander and M. H. Greenberg, ed. (1977), G. E. Slusser (1977), E. S. Rabkin (1979), and J. Hollow (1983).
See study by R. D. Altick (1948, repr. 1973).
See biography by E. E. Hale (1891, repr. 1968), which includes a fragmentary autobiography; study by A. S. Bolster (1954).
(born July 31, 1837, Canal Dover, Ohio, U.S.—died June 6, 1865, Louisville, Ky.) U.S. outlaw and Confederate guerrilla. After working as an itinerant schoolteacher, he moved to Kansas, where he failed at farming. By 1860 he was a horse thief and murderer. In the American Civil War he joined the Confederate army and later gathered a gang of guerrillas to raid and rob Union towns and farms. Quantrill's Raiders were made an official troop by the Confederates in 1862. In 1863 Quantrill and his group of about 450 men sacked the free-state town of Lawrence, Kan., killing 150 people. They later defeated a Union detachment, killing 90 soldiers. Quantrill was mortally wounded in a raid into Kentucky.
Learn more about Quantrill, William C(larke) with a free trial on Britannica.com.
(born July 31, 1837, Canal Dover, Ohio, U.S.—died June 6, 1865, Louisville, Ky.) U.S. outlaw and Confederate guerrilla. After working as an itinerant schoolteacher, he moved to Kansas, where he failed at farming. By 1860 he was a horse thief and murderer. In the American Civil War he joined the Confederate army and later gathered a gang of guerrillas to raid and rob Union towns and farms. Quantrill's Raiders were made an official troop by the Confederates in 1862. In 1863 Quantrill and his group of about 450 men sacked the free-state town of Lawrence, Kan., killing 150 people. They later defeated a Union detachment, killing 90 soldiers. Quantrill was mortally wounded in a raid into Kentucky.
Learn more about Quantrill, William C(larke) with a free trial on Britannica.com.
(born July 15, 1779, New York, N.Y., U.S.—died July 10, 1863, Newport, R.I.) U.S. scholar remembered for the ballad that begins “'Twas the night before Christmas.” Moore cofounded General Theological Seminary and taught Oriental and Greek literature there (1821–50). He is said to have composed “A Visit to St. Nicholas” to amuse his children on Christmas 1822, and it was published anonymously in the Troy (N.Y.) Sentinel, on Dec. 23, 1823. In 2000 it was determined that the poem was probably the work of Henry Livingston, Jr. (1748–1828).
Learn more about Moore, Clement Clarke with a free trial on Britannica.com.
![]()
Richard Cromwell, miniature by an unknown artist; in the National Portrait Gallery, London
Learn more about Cromwell, Richard with a free trial on Britannica.com.
(born July 15, 1779, New York, N.Y., U.S.—died July 10, 1863, Newport, R.I.) U.S. scholar remembered for the ballad that begins “'Twas the night before Christmas.” Moore cofounded General Theological Seminary and taught Oriental and Greek literature there (1821–50). He is said to have composed “A Visit to St. Nicholas” to amuse his children on Christmas 1822, and it was published anonymously in the Troy (N.Y.) Sentinel, on Dec. 23, 1823. In 2000 it was determined that the poem was probably the work of Henry Livingston, Jr. (1748–1828).
Learn more about Moore, Clement Clarke with a free trial on Britannica.com.
The second law is offered as a simple observation in the same essay; its status as Clarke's Second Law was conferred on it by others.
In a 1973 revision of his compendium of essays, Profiles of the Future, Clarke acknowledged the Second Law and proposed the Third in order to round out the number, adding "As three laws were good enough for Newton, I have modestly decided to stop there." Of the three, the Third Law is the best known and most widely cited.
Clarke's Third Law codifies perhaps the most significant of Clarke's unique contributions to speculative fiction. A model to other writers of hard science fiction, Clarke postulates advanced technologies without resorting to flawed engineering concepts (as Jules Verne sometimes did) or explanations grounded in incorrect science or engineering (a hallmark of "bad" science fiction), or taking clues from trends in research and engineering (which dates some of Larry Niven's novels). Accordingly, the powers of any future superintelligence or hyperintelligence which Clarke often described would seem astonishing.
But in novels such as The City and the Stars and the story "The Sentinel" (upon which 2001: A Space Odyssey was based) Clarke goes further; he presents us with ultra-advanced technologies developed by hyperintelligences limited only by fundamental science. In Against the Fall of Night the human race has mysteriously regressed after a full billion years of civilization. Humanity is faced with the remnants of its past glories: for example, a network of roads and sidewalks that flow like rivers. Although physically possible, it is inexplicable from their perspective. Clarke's Third Law explains the source of our amazement as our limitation, rather than the impossibility of the technology.
In his 1999 revision of Profiles of the Future, published in London by Indigo, Clarke added his Fourth Law: "For every expert there is an equal and opposite expert."
Clarke's laws, especially the third, have been referenced or alluded to numerous times in literature. Sometimes they provide corollaries to one or more of the laws. Often, these are parodies solely for humor value, but sometimes they offer interesting applications or perspectives.