Have a deep view into what people are curious about.

🔗 Law

In legal parlance, a peppercorn is a metaphor for a very small cash payment or other nominal consideration, used to satisfy the requirements for the creation of a legal contract. It is featured in Chappell & Co Ltd v Nestle Co Ltd ([1960] AC 87), which stated that "a peppercorn does not cease to be good consideration if it is established that the promisee does not like pepper and will throw away the corn". However, the cited passage is mere dicta, and not the basis for the decision.

🔗 Biography 🔗 Mathematics 🔗 Biography/science and academia 🔗 History of Science 🔗 Switzerland 🔗 Genealogy

The Bernoulli family (German pronunciation: [bɛʁˈnʊli]) of Basel was a patrician family, notable for having produced eight mathematically gifted academics who, among them, contributed substantially to the development of mathematics and physics during the early modern period.

A rotary woofer is a subwoofer-style loudspeaker which reproduces very low frequency content by using a conventional speaker voice coil's motion to change the pitch (angle) of the blades of an impeller rotating at a constant speed. The pitch of the fan blades is controlled by the audio signal presented to the voice coil, and is able to swing both positive and negative, with respect to a zero pitch spinning blade position. Since the audio amplifier only changes the pitch of the blades, it takes much less power, per dB of generated acoustic sound level, to drive a rotary woofer than to power a conventional subwoofer, which uses a moving electromagnet (voice coil) placed within the field of a stationary permanent magnet to drive a cone which then displaces air. Rotary woofers excel at producing sounds below 20 Hz, below the normal hearing range; when installed in the wall of a sealed room, they can produce audio frequencies down to 0 Hz, a static pressure differential, by simply compressing the air in the sealed room.

🔗 Linguistics 🔗 Linguistics/Applied Linguistics 🔗 Writing systems

The orthographic depth of an alphabetic orthography indicates the degree to which a written language deviates from simple one-to-one letter–phoneme correspondence. It depends on how easy it is to predict the pronunciation of a word based on its spelling: shallow orthographies are easy to pronounce based on the written word, and deep orthographies are difficult to pronounce based on how they are written.

In shallow orthographies, the spelling-sound correspondence is direct: from the rules of pronunciation, one is able to pronounce the word correctly. In other words, shallow (transparent) orthographies, also called phonemic orthographies, have a one-to-one relationship between its graphemes and phonemes, and the spelling of words is very consistent. Such examples include Hindi, Spanish, Finnish, Turkish, Latin and Italian.

In contrast, in deep (opaque) orthographies, the relationship is less direct, and the reader must learn the arbitrary or unusual pronunciations of irregular words. In other words, deep orthographies are writing systems that do not have a one-to-one correspondence between sounds (phonemes) and the letters (graphemes) that represent them. They may reflect etymology (English, Faroese, Mongolian script, Thai, French, or Franco-Provençal) or be morphophonemic (Korean or Russian).

Written Korean represents an unusual hybrid; each phoneme in the language is represented by a letter but the letters are packaged into "square" units of two to four phonemes, each square representing a syllable. Korean has very complex phonological variation rules, especially regarding the consonants rather than the vowels, in contrast to English. For example, the Korean word 훗일, which should be pronounced as [husil] based on standard pronunciations of the components of the grapheme, is actually pronounced as [hunnil]. Among the consonants of the Korean language, only one is always pronounced exactly as it is written.

Italian offers clear examples of differential directionality in depth. Even in a very shallow orthographic system, spelling-to-pronunciation and pronunciation-to-spelling may not be equally clear. There are two major imperfect matches of vowels to letters: in stressed syllables, e can represent either open [ɛ] or closed [e], and o stands for either open [ɔ] or closed [o]. According to the orthographic principles used for the language, [ˈsɛtta] 'sect', for example, with open [ɛ] can only be spelled setta, and [ˈvetta] 'summit' with closed [e] can only be vetta — if a listener can hear it, they can spell it. But since the letter e is assigned to represent both [ɛ] and [e], there is no principled way to know whether to pronounce the written words setta and vetta with [ɛ] or [e] — the spelling does not present the information needed for accurate pronunciation. A second lacuna in Italian's shallow orthography is that although stress position in words is only very partially predictable, it is normally not indicated in writing. For purposes of spelling, it makes no difference which syllable is stressed in the place names Arsoli and Carsoli, but the spellings offer no clue that they are ARsoli and CarSOli (and as with the letter e above, the stressed o of Carsoli, which is [ɔ], is unknown from the spelling).

🔗 Systems 🔗 Robotics 🔗 Systems/Cybernetics

The Johns Hopkins Beast was a mobile automaton, an early pre-robot, built in the 1960s at the Johns Hopkins University Applied Physics Laboratory. The machine had a rudimentary intelligence and the ability to survive on its own. As it wandered through the white halls of the laboratory, it would seek black wall outlets. When it found one it would plug in and recharge.

The robot was cybernetic. It did not use a computer. Its control circuitry consisted of dozens of transistors controlling analog voltages. It used photocell optics and sonar to navigate. The 2N404 transistors were used to create NOR logic gates that implemented the Boolean logic to tell it what to do when a specific sensor was activated. The 2N404 transistors were also used to create timing gates to tell it how long to do something. 2N1040 Power transistors were used to control the power to the motion treads, the boom, and the charging mechanism.

The original sensors in Mod I were physical touch only. The wall socket was detected by physical switches on the arm that followed the wall. Once detected, two electrical prongs were extended until they entered the wall socket and made the electrical connection to charge the vehicle. The stairway, doors, and pipes on the hall wall were also detected by physical switches and recognized by appropriate logic.

The sonar guidance system was developed for Mod I and improved for Mod II. It used two ultrasonic transducers to determine distance, location within the halls, and obstructions in its path. This provided "The Beast" with bat-like guidance. At this point, it could detect obstructions in the hallway, such as people in the hallway. Once an obstruction was detected, the Beast would slow down and then decide whether to stop or divert around the obstruction. It could also ultrasonically recognize the stairway and doorways to take appropriate action.

An optical guidance system was added to Mod II. This provided, among other capabilities, the ability to optically identify the black wall sockets that contrasted with the white wall.

The Hopkins Beast Autonomous Robot Mod II link below was written by Dr. Ronald McConnell, at that time a co-op student and one of the designers for Mod II.

🔗 Computer science 🔗 Mathematics 🔗 Systems 🔗 Cryptography 🔗 Cryptography/Computer science 🔗 Systems/Operations research

The knapsack problem is a problem in combinatorial optimization: Given a set of items, each with a weight and a value, determine the number of each item to include in a collection so that the total weight is less than or equal to a given limit and the total value is as large as possible. It derives its name from the problem faced by someone who is constrained by a fixed-size knapsack and must fill it with the most valuable items. The problem often arises in resource allocation where the decision makers have to choose from a set of non-divisible projects or tasks under a fixed budget or time constraint, respectively.

The knapsack problem has been studied for more than a century, with early works dating as far back as 1897. The name "knapsack problem" dates back to the early works of mathematician Tobias Dantzig (1884–1956), and refers to the commonplace problem of packing the most valuable or useful items without overloading the luggage.

🔗 British Museum 🔗 Radio 🔗 BBC 🔗 Radio/UK Radio

A History of the World in 100 Objects was a joint project of BBC Radio 4 and the British Museum, comprising a 100-part radio series written and presented by British Museum director Neil MacGregor. In 15-minute presentations broadcast on weekdays on Radio 4, MacGregor used objects of ancient art, industry, technology and arms, all of which are in the British Museum's collections, as an introduction to parts of human history. The series, four years in planning, began on 18 January 2010 and was broadcast over 20 weeks. A book to accompany the series, A History of the World in 100 Objects by Neil MacGregor, was published by Allen Lane on 28 October 2010. The entire series is also available for download along with an audio version of the book for purchase. The British Museum won the 2011 Art Fund Prize for its role in hosting the project.

In 2016, a touring exhibition of several items depicted on the radio program, also titled A History of the World in 100 Objects, travelled to various destinations, including Abu Dhabi (Manarat Al Saadiyat), Taiwan (National Palace Museum in Taipei), Japan (Tokyo Metropolitan Art Museum in Tokyo, Kyushu National Museum in Daizafu, and Kobe City Museum in Kobe), Australia (Western Australian Museum in Perth and National Museum of Australia in Canberra), and China (National Museum of China in Beijing and Shanghai Museum in Shanghai).

🔗 Computing

Proxmox Virtual Environment (Proxmox VE or PVE) is an open-source software server for virtualization management. It is a hosted hypervisor that can run operating systems including Linux and Windows on x64 hardware. It is a Debian-based Linux distribution with a modified Ubuntu LTS kernel and allows deployment and management of virtual machines and containers. Proxmox VE includes a web console and command-line tools, and provides a REST API for third-party tools. Two types of virtualization are supported: container-based with LXC (starting from version 4.0 replacing OpenVZ used in version up to 3.4, included), and full virtualization with KVM. It includes a web-based management interface.

Proxmox VE is licensed under the GNU Affero General Public License, version 3.

🔗 Comedy

Meta-joke refers to several somewhat different, but related categories: joke templates, self-referential jokes, and jokes about jokes (also known as meta-humor).

🔗 United States 🔗 Biography 🔗 Business 🔗 Automobiles 🔗 Miami 🔗 Indiana Historical Society 🔗 Biography/sports and games 🔗 United States/Indiana

Carl Graham Fisher (January 12, 1874 – July 15, 1939) was an American entrepreneur. Despite severe astigmatism, he became actively involved in auto racing. He was a seemingly tireless pioneer and promoter of the automotive industry and highway construction, and of real estate development in Florida. He is widely regarded as a promotional genius.

Despite family financial strains and a disability, in the late 19th century he became a bicycle enthusiast and opened a modest bicycle shop with a brother. He became involved in bicycle racing, as well as many activities related to the emerging American auto industry. In 1904, Carl Fisher and his friend James A. Allison bought an interest in the U.S. patent to manufacture acetylene headlights, a precursor to electric models which became common about ten years later. Soon Fisher's firm supplied nearly every headlamp used on automobiles in the United States as manufacturing plants were built all over the country to supply the demand. The headlight patent made him rich as an automotive parts supplier when he and Allison sold their company, Prest-O-Lite, to Union Carbide in 1913 for $9 million (equivalent of approximately $230 million in 2019).

Fisher operated in Indianapolis what is believed to be the first automobile dealership in the United States, and also worked at developing an automobile racetrack locally. After being injured in stunts himself, and following a safety debacle at the new Indianapolis Motor Speedway, of which he was a principal, he helped develop paved racetracks and public roadways. Improvements he implemented at the speedway led to its nickname, "The Brickyard."

In 1912, Fisher conceived and helped develop the Lincoln Highway, the first road for the automobile across the entire United States of America. A convoy trip a few years later by the U.S. Army along Fisher's Lincoln Highway was a major influence upon then Lt. Col. Dwight D. Eisenhower years later in championing the Interstate Highway System during his presidency in the 1950s.

Carl Fisher followed the east-west Lincoln Highway in 1914 with the conception of the north-south Dixie Highway, which led from Michigan to Miami. Under his leadership, the initial portion was completed within a single year, and he led an automobile caravan to Florida from Indiana.

At the south end of the Dixie Highway in Miami, Florida, Fisher, with the assistance of his partners John Graham McKay and Thomas Walkling, became involved in the successful real estate development of the new resort city of Miami Beach, built on a largely unpopulated barrier island and reached by the new Collins Bridge across Biscayne Bay directly at the terminus of the Dixie Highway. Fisher was one of the best known and active promoters of the Florida land boom of the 1920s. By 1926, he was worth an estimated $100 million, and redirected his promotional efforts when the Florida real estate market bubble burst after 1925. His final major project, cut short by the Great Depression, was a "Miami Beach of the north" at Montauk, located at the eastern tip of Long Island, New York.

His fortune was lost in the Stock Market Crash of 1929 and the Great Depression in the United States which followed shortly thereafter. He found himself living in a small cottage in Miami Beach, doing minor work for old friends. Nevertheless, years after his fortune had been lost, at the end of his career, he took on one more project, albeit more modest than many of his past ventures, and built the famous Caribbean Club on Key Largo, intended as a "poor man's retreat."

Although he had lost his fortune and late in life considered himself a failure, Fisher is widely regarded as a decidedly successful man in the long view of his life. He was inducted into the Automotive Hall of Fame in 1971. In a 1998 study judged by a panel of 56 historians, writers, and others, Carl G. Fisher was named one of the Fifty Most Influential People in the history of the State of Florida by The Ledger newspaper. PBS labeled him "Mr. Miami Beach." Just south of Miami Beach, Fisher Island (which he once owned, and is named for him), became one of the wealthiest and most exclusive residential areas in the United States.