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Topic Review
Deriving the Schwarzschild Solution
The Schwarzschild solution describes spacetime under the influence of a massive, non-rotating, spherically symmetric object. It is considered by some to be one of the simplest and most useful solutions to the Einstein field equations.
  • 4.2K
  • 18 Oct 2022
Topic Review
Anki
Anki (/ˈɒŋkiː/; Japanese: [aŋki]) is a free and open-source flashcard program using spaced repetition, a technique from cognitive science for fast and long-lasting memorization. "Anki" (暗記) is the Japanese word for "memorization". The SM-2 algorithm, created for SuperMemo in the late 1980s, forms the basis of the spaced repetition methods employed in the program. Anki's implementation of the algorithm has been modified to allow priorities on cards and to show flashcards in order of their urgency. The cards are presented using HTML and may include text, images, sounds, videos, and LaTeX equations. The decks of cards, along with the user's statistics, are stored in the open SQLite format.
  • 4.2K
  • 01 Dec 2022
Topic Review
Sexual Robots
The area of human-robot interaction (HRI), particularly concerning sexual robots, has begun to attract interest in various social issues, such as emotions, ethics, philosophy, and psychology. These new relationships between sexual robots and humans have also awakened the interest of the media, the industry, and the maker world since with a 3D printer, it is already possible to create a sexual robot. Society has begun to consider the idea of having sex with robots, and there is the belief that this will be normal in the future. Although there is still no scientific evidence of its therapeutic benefits, many think it can help treat sexual dysfunctions or even help decrease women’s sexual exploitation. Like sex toys, some experts consider sexual robots (or sexbots) to be the future of sex relationships potentially. 
  • 4.2K
  • 11 Jan 2021
Topic Review
Platypus
The platypus (Ornithorhynchus anatinus), sometimes referred to as the duck-billed platypus, is a semiaquatic, egg-laying mammal endemic to eastern Australia, including Tasmania. The platypus is the sole living representative or monotypic taxon of its family (Ornithorhynchidae) and genus (Ornithorhynchus), though a number of related species appear in the fossil record. Together with the four species of echidna, it is one of the five extant species of monotremes, mammals that lay eggs instead of giving birth to live young. Like other monotremes, it senses prey through electrolocation. It is one of the few species of venomous mammals, as the male platypus has a spur on the hind foot that delivers a venom, capable of causing severe pain to humans. The unusual appearance of this egg-laying, duck-billed, beaver-tailed, otter-footed mammal baffled European naturalists when they first encountered it, and the first scientists to examine a preserved platypus body (in 1799) judged it a fake, made of several animals sewn together. The unique features of the platypus make it an important subject in the study of evolutionary biology, and a recognisable and iconic symbol of Australia . It is culturally significant to several Aboriginal peoples of Australia, who also used to hunt the animal for food. It has appeared as a mascot at national events and features on the reverse of the Australian twenty-cent coin, and the platypus is the animal emblem of the state of New South Wales. Until the early 20th century, humans hunted the platypus for its fur, but it is now protected throughout its range. Although captive-breeding programs have had only limited success, and the platypus is vulnerable to the effects of pollution, it is not under any immediate threat. (As of 2020), the platypus is a legally protected species in all states where it occurs. It is listed as an endangered species in South Australia and Victoria and has been recommended for listing in New South Wales. The species is classified as a near-threatened species by the IUCN, but a November 2020 report has recommended that it is upgraded to threatened species under the federal EPBC Act, due to habitat destruction and declining numbers in all states.
  • 4.2K
  • 18 Nov 2022
Topic Review
Entrepreneurial Self-Efficacy
Sustaining youths interest in entrepreneurial education is important to cultivating future entrepreneurs. In entrepreneurial education, both perceived educator competency and perceived social support are important drivers for the creation of self-efficacy in youth.
  • 4.2K
  • 07 May 2022
Topic Review
Online Auction
An online auction is an auction which is held over the internet. Online auctions come in many different formats, but most popularly they are ascending English auctions, descending Dutch auctions, first-price sealed-bid, Vickrey auctions, or sometimes even a combination of multiple auctions, taking elements of one and forging them with another. The scope and reach of these auctions have been propelled by the Internet to a level beyond what the initial purveyors had anticipated. This is mainly because online auctions break down and remove the physical limitations of traditional auctions such as geography, presence, time, space, and a small target audience. This influx in reachability has also made it easier to commit unlawful actions within an auction. In 2002, online auctions were projected to account for 30% of all online e-commerce due to the rapid expansion of the popularity of the form of electronic commerce. Online auctions include business to business (B2B), business to consumer (B2C), and consumer to consumer (C2C) auctions. The largest online auction site is eBay, which was the first to support person-to-person transactions. Other popular examples of online auction sites include WebStore, OnlineAuction and Overstock.
  • 4.2K
  • 06 Dec 2022
Topic Review
Toxic Ingredients in Skin Lightening Cosmetics
Skin lightening is defined as "the practice of using chemicals or any other product with depigmenting potential in an attempt to lighten skin tone or improve the complexion; these goals are achieved by decreasing the concentration of melanin to achieve a reduction in the physiological pigmentation of the skin". Products used to achieve this purpose are known as depigmenting, skin-lightening, skin-bleaching, skin-brightening or skin-evening agents. Skin-whitening products containing highly toxic active ingredients (in particular mercury derivatives, hydroquinone and corticosteroids) are easily found on the market; the use of these depigmenting agents can be followed by a variety of adverse effects, with very serious and sometimes fatal complications, and is currently an emerging health concern in many countries. 
  • 4.2K
  • 26 May 2022
Topic Review
German Gold Mark
Goldmark (officially just Mark, sign: ℳ) was the gold standard-based currency of the German Empire from 1873 to 1914. Papiermark was the Mark after the gold standard was given up in August 1914, and gold and silver coins ceased to circulate.
  • 4.2K
  • 08 Oct 2022
Topic Review
Brahmacarya
Brahmacharya (/ˌbrɑːməˈtʃɑːrjə/; Devanagari: ब्रह्मचर्य, Bengali: ব্রহ্মচর্য odia:ବ୍ରହ୍ମଚର୍ଯ୍ୟ lit."pure conduct") is a concept within Indian religions that literally means to stay in conduct within one's own Self. In Yoga, Hinduism and Jainism it generally refers to a lifestyle characterized by sexual continence or complete abstinence. Brahmacharya is somewhat different from the English term "celibacy," which merely means non-indulgence in sexual activity. Brahmacharya is when a person completely controls his body and mind (citta) through ascetic means. In the Hindu, Jain, and Buddhist monastic traditions, brahmacharya implies, among other things, the mandatory renunciation of sex and marriage. It is considered necessary for a monk's spiritual practice. Western notions of the religious life as practiced in monastic settings mirror these characteristics.
  • 4.2K
  • 04 Nov 2022
Topic Review
Transparent Conducting Oxides
A Transparent Conducting Oxides (TCO) is a wide band-gap semiconductor that has high concentration of free electrons in its conduction band.
  • 4.2K
  • 31 Mar 2021
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