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๐ Anti-intellectualism in American Life
Anti-intellectualism in American Life is a book by Richard Hofstadter published in 1963 that won the 1964 Pulitzer Prize for General Non-Fiction. In this book, Hofstadter set out to trace the social movements that altered the role of intellect in American society. In so doing, he explored questions regarding the purpose of education and whether the democratization of education altered that purpose and reshaped its form. In considering the historic tension between access to education and excellence in education, Hofstadter argued that both anti-intellectualism and utilitarianism were consequences, in part, of the democratization of knowledge. Moreover, he saw these themes as historically embedded in America's national fabric, an outcome of its colonial European and evangelical Protestant heritage. He contended that American Protestantism's anti-intellectual tradition valued the spirit over intellectual rigour. He also noted that Catholicism could have been expected to add a distinctive leaven to the intellectual dialogue, but American Catholicism lacked intellectual culture, due to its failure to develop an intellectual tradition or produce its own strong class of intellectuals.
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- "Anti-intellectualism in American Life" | 2019-09-16 | 86 Upvotes 113 Comments
๐ Sussman anomaly
The Sussman anomaly is a problem in artificial intelligence, first described by Gerald Sussman, that illustrates a weakness of noninterleaved planning algorithms, which were prominent in the early 1970s. In the problem, three blocks (labeled A, B, and C) rest on a table. The agent must stack the blocks such that A is atop B, which in turn is atop C. However, it may only move one block at a time. The problem starts with B on the table, C atop A, and A on the table:
However, noninterleaved planners typically separate the goal (stack A atop B atop C) into subgoals, such as:
- get A atop B
- get B atop C
Suppose the planner starts by pursuing Goal 1. The straightforward solution is to move C out of the way, then move A atop B. But while this sequence accomplishes Goal 1, the agent cannot now pursue Goal 2 without undoing Goal 1, since both A and B must be moved atop C:
If instead the planner starts with Goal 2, the most efficient solution is to move B. But again, the planner cannot pursue Goal 1 without undoing Goal 2:
The problem was first identified by Sussman as a part of his PhD research. Sussman (and his supervisor, Marvin Minsky) believed that intelligence requires a list of exceptions or tricks, and developed a modular planning system for "debugging" plans. Most modern planning systems can handle this anomaly, but it is still useful for explaining why planning is non-trivial.
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- "Sussman anomaly" | 2018-01-15 | 151 Upvotes 41 Comments
๐ The fastest pulsar spins at 716Hz; its equator spins at 24% the speed of light
PSR J1748โ2446ad is the fastest-spinning pulsar known, at 716 Hz, or 716 times per second. This pulsar was discovered by Jason W. T. Hessels of McGill University on November 10, 2004 and confirmed on January 8, 2005.
If the neutron star is assumed to contain less than two times the mass of the Sun, within the typical range of neutron stars, its radius is constrained to be less than 16ย km. At its equator it is spinning at approximately 24% of the speed of light, or over 70,000ย km per second.
The pulsar is located in a globular cluster of stars called Terzan 5, located approximately 18,000 light-years from Earth in the constellation Sagittarius. It is part of a binary system and undergoes regular eclipses with an eclipse magnitude of about 40%. Its orbit is highly circular with a 26-hour period. The other object is at least 0.14 solar masses, with a radius of 5โ6 solar radii. Hessels et al. state that the companion may be a "bloated main-sequence star, possibly still filling its Roche Lobe". Hessels et al. go on to speculate that gravitational radiation from the pulsar might be detectable by LIGO.
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- "The fastest pulsar spins at 716Hz; its equator spins at 24% the speed of light" | 2014-02-17 | 122 Upvotes 78 Comments
๐ Game Oriented Assembly Lisp
Game Oriented Assembly Lisp (GOAL) is a programming language, a dialect of the language Lisp, made for video games developed by Andy Gavin and the Jak and Daxter team at the company Naughty Dog.
It was written using Allegro Common Lisp and used in the development of the entire Jak and Daxter series of games.
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- "Game Oriented Assembly Lisp" | 2011-01-11 | 47 Upvotes 7 Comments
๐ Holon
A holon (Greek: แฝ ฮปฮฟฮฝ, from แฝ ฮปฮฟฯ, holos, 'whole' and -ฮฟฮฝ, -on, 'part') is something that is simultaneously a whole in and of itself, as well as a part of a larger whole. In other words, holons can be understood as the constituent partโwholes of a hierarchy.
The holon represents a way to overcome the dichotomy between parts and wholes, as well as a way to account for both the self-assertive and the integrative tendencies of organisms. The term was coined by Arthur Koestler in The Ghost in the Machine (1967). In Koestler's formulations, a holon is something that has integrity and identity while simultaneously being a part of a larger system; it is a subsystem of a greater system.
Holons are sometimes discussed in the context of self-organizing holarchic open (SOHO) systems.
๐ 54% of adults in the United States have prose literacy below the 6th-grade level
A 2019 report by the National Center for Education Statistics determined that mid to high literacy in the United States is 79% with 21% of American adults categorized as having "low level English literacy," including 4.1% classified as "functionally illiterate" and an additional 4% that could not participate. According to the U.S. Department of Education, 54% of adults in the United States have prose literacy below the 6th-grade level.
In many nations, the ability to read a simple sentence suffices as literacy, and was the previous standard for the U.S. The definition of literacy has changed greatly; the term is presently defined as the ability to use printed and written information to function in society, to achieve one's goals, and to develop one's knowledge and potential.
The United States Department of Education assesses literacy in the general population through its National Assessment of Adult Literacy (NAAL). The NAAL survey defines three types of literacy:
- prose literacy: the knowledge and skills needed to search, comprehend, and use continuous texts. Examples include editorials, news stories, brochures, and instructional materials.
- document literacy: the knowledge and skills needed to search, comprehend, and use non-continuous texts in various formats. Examples include job applications, payroll forms, transportation schedules, maps, tables, and drug and food labels.
- quantitative literacy: the knowledge and skills required to identify and perform computations, either alone or sequentially, using numbers embedded in printed materials. Examples include balancing a checkbook, figuring out tips, completing an order form, or determining an amount.
Modern jobs often demand a high level of literacy, and its lack in adults and adolescents has been studied extensively.
According to a 1992 survey, about 40 million adults had Level 1 literary competency, the lowest level, comprising understanding only basic written instructions. A number of reports and studies are published annually to monitor the nation's status, and initiatives to improve literacy rates are funded by government and external sources.
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- "54% of adults in the United States have prose literacy below the 6th-grade level" | 2021-12-29 | 166 Upvotes 207 Comments
๐ V-Mail
V-mail, short for Victory Mail, was a hybrid mail process used by the United States during the Second World War as the primary and secure method to correspond with soldiers stationed abroad. To reduce the cost of transferring an original letter through the military postal system, a V-mail letter would be censored, copied to film, and printed back to paper upon arrival at its destination. The V-mail process is based on the earlier British Airgraph process.
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- "V-Mail" | 2019-11-11 | 110 Upvotes 7 Comments
๐ Li Wenliang
Li Wenliang (Chinese: ๆๆไบฎ; pinyin: Lว Wรฉnliร ng; 12 October 1986 โ 7 February 2020) was a Chinese ophthalmologist who worked as a physician at Wuhan Central Hospital. Li warned his colleagues in December 2019 about a possible outbreak of an illness that resembled severe acute respiratory syndrome (SARS), later acknowledged as COVID-19. He became a whistleblower when his warnings were later shared publicly. On 3 January 2020, Wuhan police summoned and admonished him for "making false comments on the Internet". Li returned to work, later contracted the virus from an infected patient (who had been originally treated for glaucoma) and died from the disease on 7 February 2020, at age 33. A subsequent Chinese official inquiry exonerated him and the Communist Party formally offered a "solemn apology" to his family and revoked its admonishment of him.
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- "Li Wenliang" | 2020-02-11 | 350 Upvotes 206 Comments
๐ Josephson Voltage Standard
A Josephson voltage standard is a complex system that uses a superconducting integrated circuit chip operating at a temperature of 4ย K to generate stable voltages that depend only on an applied frequency and fundamental constants. It is an intrinsic standard in the sense that it does not depend on any physical artifact. It is the most accurate method to generate or measure voltage and, by international agreement in 1990, is the basis for voltage standards around the world.
๐ Tza'ar Ba'alei Chayim
Tza'ar ba'alei chayim (Hebrew: ืฆืขืจ ืืขืื ืืืืโ), literally "suffering of living creatures", is a Jewish commandment which bans causing animals unnecessary suffering. This concept is not clearly enunciated in the written Torah, but was accepted by the Talmud as being a biblical mandate. It is linked in the Talmud from the biblical law requiring people to assist in unloading burdens from animals (Exodus 23:5).
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- "Tza'ar Ba'alei Chayim" | 2019-09-13 | 54 Upvotes 27 Comments