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The paradox of hedonism, also called the pleasure paradox, refers to the practical difficulties encountered in the pursuit of pleasure. For the hedonist, constant pleasure-seeking may not yield the most actual pleasure or happiness in the long run—or even in the short run, when consciously pursuing pleasure interferes with experiencing it.

The utilitarian philosopher Henry Sidgwick was first to note in The Methods of Ethics that the paradox of hedonism is that pleasure cannot be acquired directly. Variations on this theme appear in the realms of ethics, philosophy, psychology, and economics.

The Atari Punk Console (commonly shortened to APC) is a popular circuit that utilizes two 555 timer ICs or a single 556 dual timer IC. The original circuit, called a "Sound Synthesizer", was published in a Radio Shack booklet: "Engineer's Notebook: Integrated Circuit Applications" in 1980 and later called "Stepped Tone Generator" in "Engineer's Mini-Notebook - 555 Circuits" by its designer, Forrest M. Mims III (Siliconcepts, 1984). It was named "Atari Punk Console" (APC) by Kaustic Machines crew because its "low-fi" sounds resemble classic Atari console games from the 1980s, with a square wave output similar to the Atari 2600. Kaustic Machines added a -4db line level output with volume control to the circuit which was originally designed to drive a small 8-ohm speaker.

The Atari Punk console is an astable square wave oscillator driving a monostable oscillator that creates a single (square) pulse. There are two controls, one for the frequency of the oscillator and one to control the pulse width. The controls are usually potentiometers but the circuit can also be controlled by light, temperature, pressure etc. by replacing a potentiometer with a suitable sensor (e.g., photoresistor for light sensitivity). Most of the time there is also a power switch (often a toggle switch) and a volume knob.

The circuit is a simple DIY noisemaker circuit that is relatively inexpensive and easy to build, easily adaptable and is configurable in many ways. It has been built into a wide variety of cases. Its flexibility has led to wide scale popularity among electronics enthusiasts. It is often suggested as a good circuit to build for beginners.

The Paige Compositor was an invention developed by James W. Paige (1842–1917) between 1872 and 1888. It was designed to replace the human typesetter of a lead type-composed printing form with a mechanical arm. In the early 1890s, a group of inventors signed a contract with Towner K. Webster in Chicago to produce 3000 compositors. However, the machine was not nearly as precise as it should have been and never turned a profit because of its complexity and continual need for adjustment based upon trial and error. As a result, it was the Linotype typesetting machine, which composed in a hot metal typesetting process, that became the new popular typesetting machine.

The Paige typesetting machine is notable for substantial investment that the prominent writer Mark Twain made into the failed endeavor: $300,000 ($6,000,000 today). Twain, a former printer, invested not only the bulk of his book profits but also a large portion of the inheritance of Olivia Clemens, his wife. Many point to his over-investment in the Paige typesetting machine and other inventions as the cause of not only his family's financial decline but also the decline of his wit and humor.

Webster Manufacturing made fewer than six machines costing $15,000 apiece, over three times as much as the initial production estimates. One was donated by Cornell University for a scrap metal drive during World War II. The only surviving machine is displayed at the Mark Twain House in Hartford, Connecticut.

Rat Park was a series of studies into drug addiction conducted in the late 1970s and published between 1978 and 1981 by Canadian psychologist Bruce K. Alexander and his colleagues at Simon Fraser University in British Columbia, Canada.

Alexander's hypothesis was that drugs do not cause addiction, and that the apparent addiction to opiate drugs commonly observed in laboratory rats exposed to them is attributable to their living conditions, and not to any addictive property of the drug itself.

To test his hypothesis, Alexander built Rat Park, a large housing colony, 200 times the floor area of a standard laboratory cage. There were 16–20 rats of both sexes in residence, food, balls and wheels for play, and enough space for mating. The results of the experiment appeared to support his hypothesis.

The two major science journals, Science and Nature, rejected Alexander, Coambs, and Hadaway's first paper, which appeared instead in Psychopharmacology in 1978. The paper's publication initially attracted no response. Within a few years, Simon Fraser University withdrew Rat Park's funding.

Mummia, mumia, or originally mummy referred to several different preparations in the history of medicine, from "mineral pitch" to "powdered human mummies". It originated from Arabic mūmiyā "a type of resinous bitumen found in Western Asia and used curatively" in traditional Islamic medicine, which was translated as pissasphaltus (from "pitch" and "asphalt") in ancient Greek medicine. In medieval European medicine, mūmiyā "bitumen" was transliterated into Latin as mumia meaning both "a bituminous medicine from Persia" and "mummy". Merchants in apothecaries dispensed expensive mummia bitumen, which was thought to be an effective cure-all for many ailments. It was also used as an aphrodisiac. Beginning around the 12th century when supplies of imported natural bitumen ran short, mummia was misinterpreted as "mummy", and the word's meaning expanded to "a black resinous exudate scraped out from embalmed Egyptian mummies". This began a period of lucrative trade between Egypt and Europe, and suppliers substituted rare mummia exudate with entire mummies, either embalmed or desiccated. After Egypt banned the shipment of mummia in the 16th century, unscrupulous European apothecaries began to sell fraudulent mummia prepared by embalming and desiccating fresh corpses. During the Renaissance, scholars proved that translating bituminous mummia as mummy was a mistake, and physicians stopped prescribing the ineffective drug. Lastly, artists in the 17–19th centuries used ground up mummies to tint a popular oil-paint called mummy brown.

The Mundaneum was an institution which aimed to gather together all the world's knowledge and classify it according to a system developed called the Universal Decimal Classification. It was developed at the turn of the 20th century by Belgian lawyers Paul Otlet and Henri La Fontaine. The Mundaneum has been identified as a milestone in the history of data collection and management, and (somewhat more tenuously) as a precursor to the Internet.

In the 21st century, the Mundaneum is a non-profit organisation based in Mons, Belgium that runs an exhibition space, website and archive which celebrate the legacy of the original Mundaneum.

SimHealth: The National Health Care Simulation is a management simulation video game, developed by Thinking Tools and published by Maxis with assistance from the Markle Foundation for MS-DOS in 1994. It is a simulation of the U.S. Healthcare system. The game was released during Congressional debates on the Clinton health care plan.

Due to the complexity of the game, SimHealth was seen as being very difficult. Armed with none of the tongue-in-cheek humor that Maxis's prior games were known for, the only real link to the franchise was the SimCity 2000-inspired user interface. The game was seen as more serious than other Maxis games. Noel Fritzinger, who with Lyman Orton first conceptualized CommunityViz, says that his inspiration came from seeing SimHealth and wondering if the same concepts could be applied to real-world land-use planning.

Polywater was a hypothesized polymerized form of water that was the subject of much scientific controversy during the late 1960s. By 1969 the popular press had taken notice and sparked fears of a "polywater gap" in the US.

Increased press attention also brought with it increased scientific attention, and as early as 1970 doubts about its authenticity were being circulated. By 1973 it was found to be illusory, being just water with any number of common organic compounds contaminating it.

Today, polywater is best known as an example of pathological science.

This is a partial list of notable people who have been claimed, either by themselves or by their followers, in some way to be the reincarnation or incarnation of Jesus, or the Second Coming of Christ.