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The Dymaxion car was designed by American inventor Buckminster Fuller during the Great Depression and featured prominently at Chicago's 1933/1934 World's Fair. Fuller built three experimental prototypes with naval architect Starling Burgess – using donated money as well as a family inheritance – to explore not an automobile per se, but the 'ground-taxiing phase' of a vehicle that might one day be designed to fly, land and drive – an "Omni-Medium Transport". Fuller associated the word Dymaxion with much of his work, a portmanteau of the words dynamic, maximum, and tension, to summarize his goal to do more with less.

The Dymaxion's aerodynamic bodywork was designed for increased fuel efficiency and top speed, and its platform featured a lightweight hinged chassis, rear-mounted V8 engine, front-wheel drive (a rare RF layout), and three wheels. With steering via its third wheel at the rear (capable of 90° steering lock), the vehicle could steer itself in a tight circle, often causing a sensation. Fuller noted severe limitations in its handling, especially at high speed or in high wind, due to its rear-wheel steering (highly unsuitable for anything but low speeds) and the limited understanding of the effects of lift and turbulence on automobile bodies in that era – allowing only trained staff to drive the car and saying it "was an invention that could not be made available to the general public without considerable improvements." Shortly after its launch, a prototype crashed and killed the Dymaxion's driver.

Despite courting publicity and the interest of auto manufacturers, Fuller used his inheritance to finish the second and third prototypes, selling all three, dissolving Dymaxion Corporation and reiterating that the Dymaxion was never intended as a commercial venture. One of the three original prototypes survives, and two semi-faithful replicas have recently been constructed. The Dymaxion was included in the 2009 book Fifty Cars That Changed The World and was the subject of the 2012 documentary The Last Dymaxion.

In 2008, The New York Times said Fuller "saw the Dymaxion, as he saw much of the world, as a kind of provisional prototype, a mere sketch, of the glorious, eventual future."

Claude Émile Jean-Baptiste Litre is a fictional character created in 1978 by Kenneth Woolner of the University of Waterloo to justify the use of a capital L to denote litres.

The International System of Units usually only permits the use of a capital letter when a unit is named after a person. The lower-case character l might be difficult to distinguish from the upper-case character I or the digit 1 in certain fonts and styles, and therefore both the lower-case (l) and the upper-case (L) are allowed as the symbol for litre. The United States National Institute of Standards and Technology now recommends the use of the uppercase letter L, a practice that is also widely followed in Canada and Australia.

Woolner perpetrated the April Fools' Day hoax in the April 1978 issue of "CHEM 13 News", a newsletter concerned with chemistry for school teachers. According to the hoax, Claude Litre was born on 12 February 1716, the son of a manufacturer of wine bottles. During Litre's extremely distinguished fictional scientific career, he purportedly proposed a unit of volume measurement that was incorporated into the International System of Units after his death in 1778.

The hoax was mistakenly printed as fact in the IUPAC journal Chemistry International and subsequently retracted.

XeTeX ( ZEE-tekh or ; see also Pronouncing and writing "TeX") is a TeX typesetting engine using Unicode and supporting modern font technologies such as OpenType, Graphite and Apple Advanced Typography (AAT). It was originally written by Jonathan Kew and is distributed under the X11 free software license.

Initially developed for Mac OS X only, it is now available for all major platforms. It natively supports Unicode and the input file is assumed to be in UTF-8 encoding by default. XeTeX can use any fonts installed in the operating system without configuring TeX font metrics, and can make direct use of advanced typographic features of OpenType, AAT and Graphite technologies such as alternative glyphs and swashes, optional or historic ligatures, and variable font weights. Support for OpenType local typographic conventions (locl tag) is also present. XeTeX even allows raw OpenType feature tags to be passed to the font. Microtypography is also supported. XeTeX also supports typesetting mathematics using Unicode fonts that contain special mathematical features, such as Cambria Math or Asana Math as an alternative to the traditional mathematical typesetting based on TeX font metrics.

The Artificio de Juanelo ("Gianello's artifice") was the name of two devices built in Toledo in the 16th century by Juanelo Turriano. They were designed to supply the city with a source of readily available water by lifting it from the Tagus (Tajo) river to the Alcázar. Now in ruins, the precise details of the operation of the devices are unknown, but at the time they were considered engineering wonders.

Kite aerial photography (KAP) is a type of photography. A camera is lifted using a kite and is triggered either remotely or automatically to take aerial photographs. The camera rigs can range from the extremely simple, consisting of a trigger mechanism with a disposable camera, to complex apparatus using radio control and digital cameras. On some occasions it can be a good alternative to other forms of aerial photography.

Gustl Ferdinand Mollath (born 7 November 1956 in Nuremberg) is a German man who was acquitted during a criminal trial in 2006 on the basis of diminished criminal responsibility. He was committed to a high-security psychiatric hospital, as the court deemed him a danger to the public and declared him insane based on expert diagnoses of paranoid personality disorder. The judgment became the basis of controversy when elements of his supposed delusions regarding money-laundering activities at a major bank were found to be true. Mollath had consistently claimed there was a conspiracy to have him locked up in a psychiatric care ward because of his incriminating knowledge; evidence discovered in 2012 made his claims appear plausible.

In 2006, after being accused of assaulting his former wife, Petra Mollath, Gustl Mollath was tried at the District Court of Nürnberg-Fürth for aggravated assault and wrongful deprivation of personal liberty of his ex-wife as well as damage to property. The court considered the charges proven but acquitted Mollath on the basis of finding him criminally insane. A pivotal argument for Mollath's insanity, besides the general impression he made, was that he insisted his wife was involved in a complex system of tax evasion. The court came to call it a paranoid belief system Mollath had developed, which led him to accuse many people of being part of a conspiracy and acting irrationally and aggressively, by puncturing car tires of people in a way that could lead to accidents.

In 2012, the case was widely publicized when evidence brought to the attention of state prosecutors showed that suspicious activities were carried out over several years by members of staff (including Mollath's ex-wife) at the Munich-based HypoVereinsbank, as detailed in an internal audit report carried out by the bank in 2003. The reported money transfers were not illegal per se.

In June 2013, Mollath's former wife spoke for the first time to the press. According to her, Gustl Mollath was continually violent towards her, prior and during marriage. The alleged money laundering activities became an issue only after their divorce, which directly contradicts Gustl Mollath's version that he had suffered from the illegal activities of his former wife. Gustl Mollath has denied the allegations levied against him and has said that he was being persecuted for blowing the whistle on tax evasion at HypoVereinsbank.

On August 6, 2013, the Higher Regional Court of Nuremberg ordered a retrial and Mollath's immediate release, overturning a verdict of the Regional Court of Regensburg that had blocked a retrial.

Mollath's 2018 action for damages by the unlawful custody has been concluded in November 2019 by an ex gratia payment of €600,000 by the defendant Free State of Bavaria.

In finance, the greater fool theory suggests that one can sometimes make money through the purchase of overvalued assets — items with a purchase price drastically exceeding the intrinsic value — if those assets can later be resold at an even higher price.

In this context, one "fool" might pay for an overpriced asset, on the assumption that he can probably sell it to an even "greater fool" and make a profit. This only works as long as there are new "greater fools" willing to pay higher and higher prices for the asset. Eventually, investors can no longer deny that the price is out of touch with reality, at which point a sell-off can cause the price to drop significantly until it is closer to its fair value.

Pattern theory, formulated by Ulf Grenander, is a mathematical formalism to describe knowledge of the world as patterns. It differs from other approaches to artificial intelligence in that it does not begin by prescribing algorithms and machinery to recognize and classify patterns; rather, it prescribes a vocabulary to articulate and recast the pattern concepts in precise language. Broad in its mathematical coverage, Pattern Theory spans algebra and statistics, as well as local topological and global entropic properties.

In addition to the new algebraic vocabulary, its statistical approach is novel in its aim to:

• Identify the hidden variables of a data set using real world data rather than artificial stimuli, which was previously commonplace.
• Formulate prior distributions for hidden variables and models for the observed variables that form the vertices of a Gibbs-like graph.
• Study the randomness and variability of these graphs.
• Create the basic classes of stochastic models applied by listing the deformations of the patterns.
• Synthesize (sample) from the models, not just analyze signals with them.

The Brown University Pattern Theory Group was formed in 1972 by Ulf Grenander. Many mathematicians are currently working in this group, noteworthy among them being the Fields Medalist David Mumford. Mumford regards Grenander as his "guru" in Pattern Theory.

Kakure kirishitan (Japanese: 隠れキリシタン, lit. 'hidden Christians') is a modern term for a member of the Catholic Church in Japan that went underground at the start of the Edo period in the early 17th century due to Christianity's repression by the Tokugawa shogunate.