January 13, 2011
An itch is an unpleasant sensation that causes the desire or reflex to scratch. Itching has resisted many attempts to classify it as any one type of sensory experience. It has many similarities to pain and both are unpleasant, but their response patterns are different. Pain creates a withdrawal reflex while itch leads to a scratch reflex. The feeling of itchiness can be caused by a movement of hair or the release of a chemical (histamine) from cells under the skin. Itchiness is regarded as protective, as it helps creatures remove parasites that land on their skin.
Nerve fibers for itch and pain both originate in the skin; however, information for them is conveyed in two distinct systems on the same nerve bundle and tract. Many forms of pain inhibit itch, such as noxious heat, physical rubbing/scratching, noxious chemicals, and electric shock. A variety of over-the-counter and prescription anti-itch drugs are available. Non-chemical remedies include cooling, warming, soft stimulation. Sometimes scratching relieves isolated itches, hence the existence of devices such as the back scratcher. Often, however, scratching can intensify itching and even cause further damage to the skin, dubbed the ‘itch-scratch-itch cycle.’
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January 13, 2011
Decaffeination is the act of removing caffeine from coffee beans, cocoa, or tea leaves. Decaffeinated drinks still have around 1-2% of the original caffeine remaining in them. In the case of coffee, the process is usually performed on unroasted (green) beans, and starts with steaming of the beans. They are then rinsed with a solvent that extracts the caffeine while leaving the other essential chemicals in the coffee beans. The process is repeated anywhere from 8 to 12 times until it meets either the international standard of having removed 97% of the caffeine in the beans or the EU standard of having the beans 99.9% caffeine-free by mass.
The first commercially successful decaffeination process was invented by Ludwig Roselius and Karl Wimmer in 1903. It involved steaming coffee beans with a salt water solution and then using benzene as a solvent to remove the caffeine. Coffee decaffeinated this way was sold as Kaffee HAG in most of Europe, as Café Sanka in France and later as Sanka brand coffee in the U.S. Due to health concerns regarding benzene, this process is no longer used commercially and Coffee Hag and Sanka are produced using a different process. Coffee contains over 400 chemicals important to the taste and aroma of the final drink: it is therefore challenging to remove only caffeine while leaving the other chemicals at their original concentrations.
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January 13, 2011
The Internet Corporation for Assigned Names and Numbers (ICANN) is a non-profit corporation headquartered in California that was incorporated in 1998 to oversee a number of Internet-related tasks previously performed directly on behalf of the U.S. Department of Defense, which created the Internet. ICANN manages the assignment of domain names and IP addresses. To date, much of its work is about making new generic top-level domains (e.g. .edu, .com, .gov, etc.).
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January 13, 2011
Network neutrality is a principle that restricts Internet Service Providers (ISP) and governments from giving some internet traffic (email, web, peer-to-peer, BitTorrent, etc.) priority over others. On a completely neutral network, all traffic is treated equally. On non-neutral network, ISPs could charge for access to types of traffic, instead of for access to the internet in general. Some degree of traffic management is necessary on any network, but where to draw the line is at issue presently. Many believe net neutrality to be primarily important as a preservation of current freedoms.
Vinton Cerf, considered a ‘father of the Internet’ and co-inventor of the Internet Protocol, Tim Berners-Lee, creator of the Web, and many others have spoken out in favor of network neutrality. Opponents of net neutrality contend that broadband service providers have no plans to block content or degrade network performance. In spite of this claim, some Internet service providers have intentionally slowed peer-to-peer communications. Still other companies have acted in contrast to these assertions of hands-off behavior and have begun to discriminate against P2P, FTP and online games, instituting a cell-phone style billing system of overages, free-to-telecom ‘value added’ services,’ and bundling.
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January 12, 2011
Paul English, cofounder and CTO of Kayak.com is also founder of the “gethuman” movement to restore personal contact in customer service. The most popular part of the gethuman.com website is a database of phone numbers and shortcuts to reach a humans at 500 major US corporations.
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January 12, 2011
SeatGuru is a website that features aircraft seat maps, seat reviews, and a color-coded system to identify superior and substandard airline seats. It also features information about in-flight amenities and airline specific information regarding Check-in, Baggage, Unaccompanied Minors and Traveling with Infants and Pets. SeatGuru covers more than 700 aircraft seatmaps from more than 95 different airlines. In 2007, SeatGuru was purchased by Expedia subsidiary, TripAdvisor.
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January 12, 2011
A black light is a lamp that emits electromagnetic radiation almost exclusively in the soft near ultraviolet range that is only partially visible. It is mainly seen by humans using the low-light receptors in the eye, which are sensitive to near ultraviolet. The low-light receptors however also have the distinctive feature that they are more accurate in the peripheral vision, this means black light will always look out of focus when looked at directly. In medicine, forensics, and some other scientific fields, such a light source is referred to as a Wood’s lamp (named for American physicist, Robert Williams Wood).
Black light sources have many uses. They may be employed for decorative and artistic lighting effects, for diagnostic and therapeutic uses in medicine, for the eradication of microorganisms, for the observation or detection of substances tagged with other substances that exhibit a fluorescent effect, for the curing of plastic resins and for attracting insects. Strong sources of long-wave ultraviolet light are used in tanning beds. Black light lamps are used for the detection of counterfeit money.
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January 12, 2011
Wunderwaffe (‘wonder weapon’) and was a term assigned during World War II by the German propaganda ministry to a few revolutionary ‘superweapons.’ Most of these weapons however remained more or less feasible prototypes, or reached the combat theatre too late, and in too insignificant numbers (if at all) to have a military effect. A derisive abbreviation of the term emerged: Wuwa, pronounced ‘voo-vah.’
The ‘V’-weapons (including the V-2 rocket), which were developed earlier, and saw considerable deployment especially against Great Britain, trace back to the same pool of highly inventive armament concepts. Although the Wunderwaffen failed to meet their strategic objective of turning the tides of World War II in Nazi Germany’s favor at a time when the war was already strategically lost, they represented designs and prototypes that were extremely advanced for their time including some of the the earliest work on rockets, jets, night vision, orbital weapons, and ballistic missile submarines.
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January 12, 2011
Creative Commons (CC) is a non-profit organization headquartered in San Francisco, devoted to expanding the range of creative works available for others to build upon legally and to share. The organization has released several copyright-licenses known as Creative Commons licenses free of charge to the public. These licenses allow creators to communicate which rights they reserve, and which rights they waive for the benefit of recipients or other creators. Wikipedia is one of the notable web-based projects using one of its licenses.
The organization was founded in 2001 with support of the Center for the Public Domain. The first set of copyright licenses were released in late 2002. Creative Commons is governed by a board of directors and a technical advisory board. Joi Ito is currently the chair of the board and CEO. Creative Commons has been described as being at the forefront of the copyleft movement, which seeks to support the building of a richer public domain by providing an alternative to the automatic ‘all rights reserved’ copyright.
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January 12, 2011
The Forer effect (also called the Barnum Effect after P.T. Barnum) is the observation that individuals will give high accuracy ratings to descriptions of their personality that supposedly are tailored specifically for them, but are in fact vague and general enough to apply to a wide range of people. This effect can provide a partial explanation for the widespread acceptance of some beliefs and practices, such as astrology, fortune telling, and some types of personality tests like the Myers-Briggs test.
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January 12, 2011
A personality test aims to describe aspects of a person’s character that remain stable throughout their lifetime (patterns of behavior, thoughts, and feelings). The 20th century heralded a new interest in defining and identifying separate personality types, in close correlation with the emergence of the field of psychology. As such, several distinct tests emerged; some attempt to identify specific characteristics, while others attempt to identify personality as a whole. The Myers-Briggs Type Indicator describes categories of functioning where individuals differ, such as introverted or extroverted.
The Strength Deployment Inventory assesses motivation, or purpose, of behavior, rather than the behavior itself. The 5-factor test is popular a tool for career planning, and has been shown to predict job satisfaction and performance. However, it is easy for personality test participants to become complacent about their own personal uniqueness and instead become dependent on the description associated with them. This can be potentially dangerous with persons who are already suffering from a form of identity disorder or may be a catalyst to instigate particular behaviors in a person who was previously believed to be of sound mental health.
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January 12, 2011
The theory of multiple intelligenceswas proposed by American Psychologist Howard Gardner in 1983. It describes nine types of intelligence: Spatial, Linguistic, Logical-mathematical, Bodily-kinesthetic, Musical, Interpersonal, Intrapersonal, Naturalistic, and Existential.
Of the schools implementing Gardner’s theory, the most well-known is New City School, in St. Louis, Missouri, which has been using the theory since 1988. Traditionally, schools have emphasized the development of logical intelligence and linguistic intelligence (mainly reading and writing). IQ tests focus mostly on those areas as well.
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