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Heat-assisted magnetic recording (HAMR) is a magnetic storage technology for greatly increasing the amount of data that can be stored on a magnetic device such as a hard disk drive by temporarily heating the disk material during writing, which makes it much more receptive to magnetic effects and allows writing to much smaller regions (and much higher levels of data on a disk).

The technology was initially seen as extremely difficult to achieve, with doubts expressed about its feasibility in 2013. The regions being written must be heated in a tiny area - small enough that diffraction prevents the use of normal laser focused heating - and requires a heating, writing and cooling cycle of less than 1 nanosecond, while also controlling the effects of repeated spot-heating on the drive platters, the drive-to-head contact, and the adjacent magnetic data which must not be affected. These challenges required the development of nano-scale surface plasmons (surface guided laser) instead of direct laser-based heating, new types of glass platters and heat-control coatings that tolerate rapid spot-heating without affecting the contact with the recording head or nearby data, new methods to mount the heating laser onto the drive head, and a wide range of other technical, development and control issues that needed to be overcome.

In February 2019, Seagate Technology announced that HAMR would be launched commercially in 2019, having been extensively tested at partners during 2017 and 2018. The first drives will be 16 TB, with 20 TB expected in 2020, 24 TB drives in advanced development, and 40 TB drives by around 2023. Its planned successor, known as heated-dot magnetic recording (HDMR), or bit-pattern recording, is also under development, although not expected to be available until at least 2025 or later. HAMR drives have the same form factor (size and layout) as existing traditional hard drives, and do not require any change to the computer or other device in which they are installed; they can be used identically to existing hard drives. HAMR is expected to be delayed commercially until 2022, with 10-platter hard drives using perpendicular recording (expected to be followed by SMR) being used as a stopgap solution.

The Basel problem is a problem in mathematical analysis with relevance to number theory, first posed by Pietro Mengoli in 1650 and solved by Leonhard Euler in 1734, and read on 5 December 1735 in The Saint Petersburg Academy of Sciences. Since the problem had withstood the attacks of the leading mathematicians of the day, Euler's solution brought him immediate fame when he was twenty-eight. Euler generalised the problem considerably, and his ideas were taken up years later by Bernhard Riemann in his seminal 1859 paper "On the Number of Primes Less Than a Given Magnitude", in which he defined his zeta function and proved its basic properties. The problem is named after Basel, hometown of Euler as well as of the Bernoulli family who unsuccessfully attacked the problem.

The Basel problem asks for the precise summation of the reciprocals of the squares of the natural numbers, i.e. the precise sum of the infinite series:

${\displaystyle \sum _{n=1}^{\infty }{\frac {1}{n^{2}}}={\frac {1}{1^{2}}}+{\frac {1}{2^{2}}}+{\frac {1}{3^{2}}}+\cdots .}$

The sum of the series is approximately equal to 1.644934. The Basel problem asks for the exact sum of this series (in closed form), as well as a proof that this sum is correct. Euler found the exact sum to be π²/6 and announced this discovery in 1735. His arguments were based on manipulations that were not justified at the time, although he was later proven correct, and it was not until 1741 that he was able to produce a truly rigorous proof.

The London Beer Flood was an accident at Meux & Co's Horse Shoe Brewery, London, on 17 October 1814. It took place when one of the 22-foot-tall (6.7 m) wooden vats of fermenting porter burst. The pressure of the escaping liquid dislodged the valve of another vessel and destroyed several large barrels: between 128,000 and 323,000 imperial gallons (580,000–1,470,000 L; 154,000–388,000 US gal) of beer were released in total.

The resulting wave of porter destroyed the back wall of the brewery and swept into an area of slum dwellings known as the St Giles rookery. Eight people were killed, five of them mourners at the wake being held by an Irish family for a two-year-old boy. The coroner's inquest returned a verdict that the eight had lost their lives "casually, accidentally and by misfortune". The brewery was nearly bankrupted by the event; it avoided collapse after a rebate from HM Excise on the lost beer. The brewing industry gradually stopped using large wooden vats after the accident. The brewery moved in 1921, and the Dominion Theatre is now where the brewery used to stand. Meux & Co went into liquidation in 1961.

Project Looking Glass is a now inactive free software project under the GPL to create an innovative 3D desktop environment for Linux, Solaris, and Windows. It was sponsored by Sun Microsystems.

Looking Glass is programmed in the Java language using the Java 3D system to remain platform independent. Despite the use of graphics acceleration features, the desktop explores the use of 3D windowing capabilities for both existing application programs and ones specifically designed for Looking Glass.

There is a Live CD available from Project Looking Glass. The Looking Glass environment is also included on a Live DVD (FunWorks 2007 edition) from the Granular Linux project.

Capitol Hill's mystery soda machine was a Coke vending machine in Capitol Hill, Seattle, that was in operation since at least the early 1990s until its disappearance in 2018. It is unknown who stocked the machine.

Ramanujan summation is a technique invented by the mathematician Srinivasa Ramanujan for assigning a value to divergent infinite series. Although the Ramanujan summation of a divergent series is not a sum in the traditional sense, it has properties which make it mathematically useful in the study of divergent infinite series, for which conventional summation is undefined.

The following three lists of generic and genericized trademarks are:

• marks which were originally legally protected trademarks, but have been genericized and have lost their legal status due to becoming generic terms,
• marks which have been abandoned and are now generic terms
• marks which are still legally protected as trademarks, at least in some jurisdictions

New Zealand has often been omitted from maps of the world, which has caught the attention of New Zealanders. It is considered that this is because of the widespread use of the Mercator projection, a map projection putting Europe in the center which leaves New Zealand in the bottom right-hand corner of maps, sometimes making it go overlooked by mapmakers, easily removed by an accidental crop, or simply not added for convenience, ignorance or laziness.

New Zealand has been excluded from maps at the National Museum of Natural History in Washington, D.C. in the United States, in IKEA stores, on the map of the board games Pandemic and Risk, on the map of the 2014 Nuclear Security Summit in which Prime Minister of New Zealand John Key participated, at a world map seal at the United Nations Office at Geneva in Switzerland, on the newspaper Daily Mail, on Government Executive's newsletter Defense One, on the magazine Forbes, on the digital media platform Mashable, on the Pyongyang International Airport in North Korea and on the logo of the Flat Earth Society. It was also excluded from maps promoting the 2015 Rugby World Cup even though New Zealand was the then world champion.

This recurrent occurrence has become a meme for New Zealanders. There is a community on Tumblr titled World Maps Without New Zealand and a Reddit community known as r/MapsWithoutNZ both focused on this issue with 10,000 and 30,000 members respectively as of 2017. In 2019, a user in r/MapsWithoutNZ noticed that a map, "BJÖRKSTA world map", on sale for 30 dollars at an IKEA store on Washington, D.C., did not portray New Zealand. Subsequently, IKEA apologized and removed the product from its stores. On Reddit, there also are communities about the omission of Flevoland in the Netherlands, Hawaii in the United States and Tasmania in Australia from world maps.

The New Zealand Government has acknowledged this phenomenon, and it features a map of the world in which the country is deliberately not included on the 404 error page of its official website; the page states that "something's missing". Furthermore, in 2018, a tourism campaign video was published in which the Prime Minister of New Zealand Jacinda Ardern and the New Zealander actor and comedian Rhys Darby discussed why New Zealand was being left off world maps. On the video, Darby jokingly said that it was the result of a conspiracy against New Zealand. The video promoted the hashtag #getnzonthemap.