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By His Bootstraps
"By His Bootstraps" is a 20,000 word science fiction novella by American writer Robert A. Heinlein. It plays with some of the inherent paradoxes that would be caused by time travel. The story was published in the October 1941 issue of '' Astounding Science Fiction'' under the pen name Anson MacDonald; the same issue has "Common Sense" under Heinlein's name. "By His Bootstraps" was reprinted in Heinlein's 1959 collection ''The Menace From Earth'', and in several subsequent anthologies, and is now available in at least two audio editions. Under the title "The Time Gate", it was also included in a 1958 Crest paperback anthology, ''Race to the Stars''. Plot summary Bob Wilson locks himself in his room to finish his graduate thesis on a mathematical aspect of metaphysics, using the concept of time travel as a case in point. Bob does not care much at this point whether his thesis (that time travel is impossible) is valid; he is desperate for sleep and just wants to get it done and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WikiProject Novels
A WikiProject, or Wikiproject, is a Wikimedia movement affinity group for contributors with shared goals. WikiProjects are prevalent within the largest wiki, Wikipedia, and exist to varying degrees within sister projects such as Wiktionary, Wikiquote, Wikidata, and Wikisource. They also exist in different languages, and translation of articles is a form of their collaboration. During the COVID-19 pandemic, CBS News noted the role of Wikipedia's WikiProject Medicine in maintaining the accuracy of articles related to the disease. Another WikiProject that has drawn attention is WikiProject Women Scientists, which was profiled by '' Smithsonian'' for its efforts to improve coverage of women scientists which the profile noted had "helped increase the number of female scientists on Wikipedia from around 1,600 to over 5,000". On Wikipedia Some Wikipedia WikiProjects are substantial enough to engage in cooperative activities with outside organizations relevant to the field at issue. For e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alcoholic Beverages
An alcoholic beverage (also called an alcoholic drink, adult beverage, or a drink) is a drink that contains ethanol, a type of alcohol that acts as a drug and is produced by fermentation of grains, fruits, or other sources of sugar. The consumption of alcoholic drinks, often referred to as "drinking", plays an important social role in many cultures. Most countries have laws regulating the production, sale, and consumption of alcoholic beverages. Regulations may require the labeling of the percentage alcohol content (as ABV or proof) and the use of a warning label. Some countries ban such activities entirely, but alcoholic drinks are legal in most parts of the world. The global alcoholic drink industry exceeded $1 trillion in 2018. Alcohol is a depressant, which in low doses causes euphoria, reduces anxiety, and increases sociability. In higher doses, it causes drunkenness, stupor, unconsciousness, or death. Long-term use can lead to an alcohol use disorder, an increased ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Man Who Folded Himself
''The Man Who Folded Himself'' is a 1973 science fiction novel by American writer David Gerrold. It was nominated for the Nebula Award for Best Novel in 1974 and the Hugo Award for Best Novel in 1974. The book explores the psychological, physical, and personal challenges that manifest when time travel is possible for a single individual at the touch of a button. Plot summary In 1975, Daniel Eakins, a young college student, is visited by his Uncle Jim. Uncle Jim offers to increase Daniel's monthly allowance for living expenses as long as Daniel promises to keep a diary. Shortly after, Uncle Jim dies, and Daniel inherits a "Time-belt" from him that allows the wearer to easily travel through time. Daniel quickly learns how to use the Time-belt and makes a few short jumps into his own future. He meets a future version of himself, who goes by "Don", who accompanies him to a race-track where the pair make a fortune betting on horse-racing. The following day, Daniel realises that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grandfather Paradox
A temporal paradox, time paradox, or time travel paradox is a paradox, an apparent contradiction, or logical contradiction associated with the idea of time and time travel. The notion of time travel to the future complies with current understanding of physics via relativistic time dilation, temporal paradoxes arise from circumstances involving hypothetical time travel to the past and are often used to demonstrate its impossibility. In physics, temporal paradoxes fall into two broad groups: consistency paradoxes exemplified by the grandfather paradox; and causal loops. Other paradoxes associated with time travel are a variation of the Fermi paradox and paradoxes of free will that stem from causal loops such as Newcomb's paradox. Causal loop A causal loop is a paradox of time travel that occurs when a future event is the cause of a past event, which in turn is the cause of the future event. Both events then exist in spacetime, but their origin cannot be determined. A causal loop may ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Causal Loop
A causal loop is a theoretical proposition, wherein by means of either retrocausality or time travel, an event (an action, information, object, or person) is among the causes of another event, which is in turn among the causes of the first-mentioned event. Such causally looped events then exist in spacetime, but their origin cannot be determined. A hypothetical example of a causality loop is given of a billiard ball striking its past self: the billiard ball moves in a path towards a time machine, and the future self of the billiard ball emerges from the time machine ''before'' its past self enters it, giving its past self a glancing blow, altering the past ball's path and causing it to enter the time machine at an angle that would cause its future self to strike its past self the very glancing blow that altered its path. In this sequence of events, the change in the ball's path is its own cause, which might appear paradoxical. Other terms for "causal loop" are bootstrap paradox, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bootstrapping
In general, bootstrapping usually refers to a self-starting process that is supposed to continue or grow without external input. Etymology Tall boots may have a tab, loop or handle at the top known as a bootstrap, allowing one to use fingers or a boot hook tool to help pulling the boots on. The saying "to " was already in use during the 19th century as an example of an impossible task. The idiom dates at least to 1834, when it appeared in the ''Workingman's Advocate'': "It is conjectured that Mr. Murphee will now be enabled to hand himself over the Cumberland river or a barn yard fence by the straps of his boots."Jan FreemanBootstraps and Baron Munchausen ''Boston.com'', January 27, 2009 In 1860 it appeared in a comment on philosophy of mind: "The attempt of the mind to analyze itself san effort analogous to one who would lift himself by his own bootstraps." Bootstrap as a metaphor, meaning to better oneself by one's own unaided efforts, was in use in 1922. This metaphor spa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carl Sagan
Carl Edward Sagan (; ; November 9, 1934December 20, 1996) was an American astronomer, planetary scientist, cosmologist, astrophysicist, astrobiologist, author, and science communicator. His best known scientific contribution is research on extraterrestrial life, including experimental demonstration of the production of amino acids from basic chemicals by radiation. Sagan assembled the first physical messages sent into space, the Pioneer plaque and the Voyager Golden Record, universal messages that could potentially be understood by any extraterrestrial intelligence that might find them. Sagan argued the hypothesis, accepted since, that the high surface temperatures of Venus can be attributed to, and calculated using, the greenhouse effect.Extract of page 14 Initially an assistant professor at [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Philosophical Quarterly
The ''American Philosophical Quarterly'' (APQ) is a peer-reviewed academic journal covering philosophy. It was established in 1964 by Nicholas Rescher and is published quarterly by University of Illinois Press under license with North American Philosophical Publications. Abstracting and indexing The journal is abstracted and indexed in: Notable articles * "Causes and Conditions" (1965) - J. L. Mackie * "Indicators and Quasi-indicators" (1967) - Hector-Neri Castañeda * "Truth in fiction" (1978) - David Lewis * "Supervenience and Nomological Incommensurables" (1978) - Jaegwon Kim * "The Corporation as a Moral Person" (1979) - Peter A French * "On Reasoning about Values" (1980) - Wilfred Sellars * "From Exasperating Virtues to Civic Virtues" (1996) - Amélie Oksenberg Rorty * "The Enforcement of Morality" (2000) - John Kekes See also * List of philosophy journals This is a list of academic journals pertaining to the field of philosophy. Journals in Catalan * '' Filo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
All You Zombies
"'—All You Zombies—'" is a science fiction short story by American writer Robert A. Heinlein. It was written in one day, July 11, 1958, and first published in the March 1959 issue of ''Fantasy and Science Fiction'' magazine after being rejected by ''Playboy''. The story involves a number of paradoxes caused by time travel. In 1980, it was nominated for the Balrog Award for short fiction. —All You Zombies— further develops themes explored by the author in a previous work: " By His Bootstraps", published some 18 years earlier. Some of the same elements also appear later in ''The Cat Who Walks Through Walls'' (1985), including the Circle of Ouroboros and the Temporal Corps. The unusual title of the story, which includes both the quotation marks and dashes shown above, is a quotation from a sentence near the end of the story; the quotation is taken from the middle of the sentence, hence the dashes indicating elided text before and after the title. Plot —All You Zombie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
David Lewis (philosopher)
David Kellogg Lewis (September 28, 1941 – October 14, 2001) was an American philosopher who is widely regarded as one of the most important philosophers of the 20th century. Lewis taught briefly at UCLA and then at Princeton University from 1970 until his death. He is closely associated with Australia, whose philosophical community he visited almost annually for more than 30 years. Lewis made significant contributions in philosophy of mind, philosophy of probability, epistemology, philosophical logic, aesthetics, philosophy of mathematics, philosophy of time and philosophy of science. In most of these fields he is considered among the most important figures of recent decades. But Lewis is most famous for his work in metaphysics, philosophy of language and semantics, in which his books ''On the Plurality of Worlds'' (1986) and ''Counterfactuals'' (1973) are considered classics. His works on the logic and semantics of counterfactual conditionals are broadly used by philosop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Galaxy Science Fiction
''Galaxy Science Fiction'' was an American digest-size science fiction magazine, published in Boston from 1950 to 1980. It was founded by a French-Italian company, World Editions, which was looking to break into the American market. World Editions hired as editor H. L. Gold, who rapidly made ''Galaxy'' the leading science fiction magazine of its time, focusing on stories about social issues rather than technology. Gold published many notable stories during his tenure, including Ray Bradbury's "The Fireman", later expanded as ''Fahrenheit 451''; Robert A. Heinlein's ''The Puppet Masters''; and Alfred Bester's ''The Demolished Man''. In 1952, the magazine was acquired by Robert Guinn, its printer. By the late 1950s, Frederik Pohl was helping Gold with most aspects of the magazine's production. When Gold's health worsened, Pohl took over as editor, starting officially at the end of 1961, though he had been doing the majority of the production work for some time. Under Pohl ''Gala ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
