Have a deep view into what people are curious about.

🔗 Chemicals 🔗 Food and drink 🔗 Pharmacology 🔗 Molecular Biology 🔗 Molecular Biology/Molecular and Cell Biology

Miraculin is a taste modifier, a glycoprotein extracted from the fruit of Synsepalum dulcificum. The berry, also known as the miracle fruit, was documented by explorer Chevalier des Marchais, who searched for many different fruits during a 1725 excursion to its native West Africa.

Miraculin itself does not taste sweet. When taste buds are exposed to miraculin, the protein binds to the sweetness receptors. This causes normally sour-tasting acidic foods, such as citrus, to be perceived as sweet. The effect can last for one or two hours.

🔗 Spaceflight

Space Infrastructure Servicing (SIS) is a spacecraft being developed by Canadian aerospace firm MacDonald, Dettwiler and Associates to operate as a small-scale in-space refueling depot for communication satellites in geosynchronous orbit.

In June 2017, SSL announced its first commercial customer, Luxembourg-based satellite owner/operator SES S.A.

🔗 Mass surveillance 🔗 Business 🔗 Psychology 🔗 Sociology

The Hawthorne effect is a type of human behavior reactivity in which individuals modify an aspect of their behavior in response to their awareness of being observed. The effect was discovered in the context of research conducted at the Hawthorne Western Electric plant; however, some scholars feel the descriptions are apocryphal.

The original research involved workers who made electrical relays at the Hawthorne Works, a Western Electric plant in Cicero, Illinois. Between 1924 and 1927, the lighting study was conducted. Workers experienced a series of lighting changes in which productivity was said to increase with almost any change in the lighting. This turned out not to be true. In the study that was associated with Elton Mayo, which ran from 1928 to 1932, a series of changes in work structure were implemented (e.g., changes in rest periods) in a group of five women. However, this was a methodologically poor, uncontrolled study that did not permit any firm conclusions to be drawn.

One of the later interpretations by Landsberger suggested that the novelty of being research subjects and the increased attention from such could lead to temporary increases in workers' productivity. This interpretation was dubbed "the Hawthorne effect".

🔗 Biography 🔗 Germany 🔗 Visual arts

The Master of the Playing Cards (German: Meister der Spielkarten) was the first major master in the history of printmaking. He was a German (or conceivably Swiss) engraver, and probably also a painter, active in southwestern Germany – probably in Alsace, from the 1430s to the 1450s, who has been called "the first personality in the history of engraving."

Various attempts to identify him have not been generally accepted, so he remains known only through his 106 engravings, which include the set of playing cards in five suits from which he takes his name. The majority of the set survives in unique impressions, most of which are in the Kupferstich-Kabinett in Dresden and the Bibliothèque nationale de France in Paris. A further 88 engravings are regarded as sufficiently close to his style to be by his pupils.

🔗 Comedy

This Man, according to a website created in 2008 by Italian marketer Andrea Natella named Ever Dream This Man?, was a person who was claimed to have been repeatedly seen in dreams by the whole world since 2006, but was never found in the real world. Natella created the site in 2008, but it was not until October 2009 that it gained attention from the press and online internet users. This Man's notoriety spawned several internet memes that spoofed flyers of the website, references in films and television shows like The X-Files, and a manga series based on the hoax by Weekly Shonen Magazine.

🔗 Literature 🔗 Typography

An intentionally blank page or vacat page (from Latin: vacare for "being empty") is a page that is devoid of content and may be unexpected. Such pages may serve purposes ranging from place-holding to space-filling and content separation. Sometimes, these pages carry a notice such as "This page [is] intentionally left blank." Such notices typically appear in printed works, such as legal documents, manuals, and exam papers, in which the reader might otherwise suspect that the blank pages are due to a printing error and where missing pages might have serious consequences.

🔗 Russia 🔗 Mathematics 🔗 Statistics 🔗 Russia/science and education in Russia

In statistics, the Gauss–Markov theorem states that the ordinary least squares (OLS) estimator has the lowest sampling variance within the class of linear unbiased estimators, if the errors in the linear regression model are uncorrelated, have equal variances and expectation value of zero. The errors do not need to be normal, nor do they need to be independent and identically distributed (only uncorrelated with mean zero and homoscedastic with finite variance). The requirement that the estimator be unbiased cannot be dropped, since biased estimators exist with lower variance. See, for example, the James–Stein estimator (which also drops linearity) or ridge regression.

The theorem was named after Carl Friedrich Gauss and Andrey Markov, although Gauss' work significantly predates Markov's. But while Gauss derived the result under the assumption of independence and normality, Markov reduced the assumptions to the form stated above. A further generalization to non-spherical errors was given by Alexander Aitken.

🔗 Crime 🔗 Death 🔗 England 🔗 Graffiti

Who put Bella down the Wych Elm? is graffiti that appeared in 1944 following the 1943 discovery by four children of the skeletonised remains of a woman inside a wych elm in Hagley Wood, Hagley (located in the estate of Hagley Hall), in Worcestershire, England. The victim—whose murder is approximated to have occurred in 1941—remains unidentified, and the current location of her skeleton and autopsy report is unknown.

🔗 Medicine 🔗 Psychology 🔗 Disability

Clanging (or clang associations) is a symptom of mental disorders, primarily found in patients with schizophrenia and bipolar disorder. This symptom is also referred to as association chaining, and sometimes, glossomania.

Steuber defines it as "repeating chains of words that are associated semantically or phonetically with no relevant context". This may include compulsive rhyming or alliteration without apparent logical connection between words.

Clanging refers specifically to behavior that is situationally inappropriate. While a poet rhyming is not evidence of mental illness, disorganized speech that impedes the patient's ability to communicate is a disorder in itself, often seen in schizophrenia.

🔗 Visual arts

Rhythm 0 was a six-hour work of performance art by Serbian artist Marina Abramović in Naples in 1974. The work involved Abramović standing still while the audience was invited to do to her whatever they wished, using one of 72 objects she had placed on a table. These included a rose, feather, perfume, honey, bread, grapes, wine, scissors, a scalpel, nails, a metal bar, a gun, and a bullet.

There were no separate stages. Abramović and the visitors stood in the same space, making it clear that the latter were part of the work. The purpose of the piece, she said, was to find out how far the public would go: "What is the public about and what are they going to do in this kind of situation?"