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🔗 History 🔗 Economics 🔗 Philosophy 🔗 Business 🔗 Philosophy/Ethics

A perverse incentive is an incentive that has an unintended and undesirable result that is contrary to the intentions of its designers. The cobra effect is the most direct kind of perverse incentive, typically because the incentive unintentionally rewards people for making the issue worse. The term is used to illustrate how incorrect stimulation in economics and politics can cause unintended consequences.

🔗 Archaeology 🔗 Wiltshire

The Stonehenge Archer is the name given to a Bronze Age man whose body was discovered in the outer ditch of Stonehenge. Unlike most burials in the Stonehenge Landscape, his body was not in a barrow, although it did appear to have been deliberately and carefully buried in the ditch.

Examination of the skeleton indicated that the man was local to the area and aged about 30 when he died. Radiocarbon dating suggests that he died around 2300 BCE, making his death roughly contemporary with the Amesbury Archer and the Boscombe Bowmen buried 3 miles away in Amesbury.

He came to be known as an archer because of the stone wrist-guard and a number of flint arrowheads buried with him. In fact, several of the arrowheads' tips were located in the skeleton's bones, suggesting that the man had been killed by them.

His body was excavated in 1978 by Richard Atkinson and John G. Evans who had been re-examining an older trench in the ditch and bank of Stonehenge. His remains are now housed in the Salisbury Museum in Salisbury.

🔗 International relations 🔗 Lists 🔗 Countries

This is a list of purchases of territory by a sovereign nation from another sovereign nation.

🔗 Ships

🔗 Aviation 🔗 Military history 🔗 Military history/Military aviation 🔗 Engineering 🔗 Industrial design

Speed tape is an aluminium pressure-sensitive tape used to perform minor repairs on aircraft and racing cars. It is used as a temporary repair material until a more permanent repair can be carried out. It has an appearance similar to duct tape, for which it is sometimes mistaken, but its adhesive is capable of sticking on an airplane fuselage or wing at high speeds, hence the name.

In computer science and mathematics, a full employment theorem is a term used, often humorously, to refer to a theorem which states that no algorithm can optimally perform a particular task done by some class of professionals. The name arises because such a theorem ensures that there is endless scope to keep discovering new techniques to improve the way at least some specific task is done.

For example, the full employment theorem for compiler writers states that there is no such thing as a provably perfect size-optimizing compiler, as such a proof for the compiler would have to detect non-terminating computations and reduce them to a one-instruction infinite loop. Thus, the existence of a provably perfect size-optimizing compiler would imply a solution to the halting problem, which cannot exist. This also implies that there may always be a better compiler since the proof that one has the best compiler cannot exist. Therefore, compiler writers will always be able to speculate that they have something to improve. A similar example in practical computer science is the idea of no free lunch in search and optimization, which states that no efficient general-purpose solver can exist, and hence there will always be some particular problem whose best known solution might be improved.

Similarly, Gödel's incompleteness theorems have been called full employment theorems for mathematicians. In theoretical computer science this field of study is known as Kolmogorov complexity, or the smallest program which outputs a given string.

Tasks such as virus writing and detection, and spam filtering and filter-breaking are also subject to Rice's theorem.

🔗 California 🔗 Companies 🔗 Technology 🔗 Private Equity 🔗 California/San Francisco Bay Area

Y Combinator is an American seed accelerator launched in March 2005 and has been used to launch over 2,000 companies including Stripe, Airbnb, Cruise Automation, DoorDash, Coinbase, Instacart, and Dropbox. The combined valuation of the top YC companies was over $155 billion as of October, 2019.

🔗 Linguistics 🔗 Czech Republic 🔗 Slovakia 🔗 Linguistics/Phonetics

Strč prst skrz krk (pronounced [str̩tʃ pr̩st skr̩s kr̩k] (listen)) is a Czech and Slovak tongue-twister meaning "stick a finger through the throat".

The sentence is well known for being a semantically and syntactically valid clause without a single vowel, the nucleus of each syllable being a syllabic r, a common feature among many Slavic languages. It is often used as an example of such a phrase when learning Czech or Slovak as a foreign language.

In fact, both Czech and Slovak have two syllabic liquid consonants, the other being syllabic l. (There is also the syllabic bilabial nasal m in sedm in Czech.) As a result, there are plenty of words without vowels. Examples of long words of this type are scvrnkls, čtvrthrst, and čtvrtsmršť, the latter two being artificial occasionalisms.

There are other examples of vowelless sentences in Czech and Slovak, such as prd krt skrz drn, zprv zhlt hrst zrn, meaning "a mole farted through grass, having swallowed a handful of grains".

The longest Czech vowelless sentence (with 25 words and 82 consonants) as of 2013 is Škrt plch z mlh Brd pln skvrn z mrv prv hrd scvrnkl z brzd skrz trs chrp v krs vrb mls mrch srn čtvrthrst zrn. The meaning of the sentence is: Stingy dormouse from Brdy mountains fogs full of manure spots firstly proudly shrank a quarter of handful seeds, a delicacy for mean does, from brakes through bunch of Centaurea flowers into scrub of willows. IPA pronunciation of this sentence is [ʃkr̩t pl̩x zml̩x br̩t pl̩n skvr̩n zmr̩f pr̩f ɦr̩t st͡svrn̩kl̩ zbr̩st skr̩s tr̩s xr̩p fkr̩s vr̩p ml̩s mr̩x sr̩n t͡ʃtvrdɦr̩st zr̩n].

🔗 Mathematics 🔗 Statistics

The Datasaurus dozen comprises thirteen data sets that have nearly identical simple descriptive statistics to two decimal places, yet have very different distributions and appear very different when graphed. It was inspired by the smaller Anscombe's quartet that was created in

🔗 Computing

A Machine Identification Code (MIC), also known as printer steganography, yellow dots, tracking dots or secret dots, is a digital watermark which certain color laser printers and copiers leave on every single printed page, allowing identification of the device with which a document was printed and giving clues to the originator. Developed by Xerox and Canon in the mid-1980s, its existence became public only in 2004. In 2018, scientists developed privacy software to anonymize prints in order to support whistleblowers publishing their work.