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This is a record of material that was recently featured on the Main Page as part of Did you know (DYK). Recently created new articles, greatly expanded former stub articles and recently promoted good articles are eligible; you can submit them for consideration.

Archives are generally grouped by month of Main Page appearance. (Currently, DYK hooks are archived according to the date and time that they were taken off the Main Page.) To find which archive contains the fact that appeared on Did you know, go to article's talk page and follow the archive link in the DYK talk page message box.

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Did you know...

...that Edith S. Sampson (pictured) was the first Black U.S. delegate to the United Nations and NATO?

Edith Sampson
...that the Canadian judicial decision Re Burley (1865), was made in colonial times, and is still cited by the Supreme Court of Canada in extradition cases over a century later?
...that the Presidential office of India operates from The Retreat at Mashobra in Himachal Pradesh, India at least once every year?
...that, in 2007, Joyland Amusement Park plans to install The Greezed Lightnin', a Schwarzkopf Shuttle Looper purchased from Astroworld in Houston, Texas?
... that French poet and novelist Louis Pergaud was a pacifist who was killed in action during World War I in 1915?
...that the alloy hepatizon was highly valuable in classical antiquity, and was named due to its similarity to the colour of liver?
...that the invention of the tone variator (pictured) in 1897 marked the advance beyond classical psychophysics, as it allowed the study of the perception of continuous changes in stimuli?

Tone variator
...that the first performance of Glinka's opera A Life for the Tsar (1836) was conducted by Catterino Cavos, who composed an opera on the same subject 20 years before Glinka?
...that "Hippias Major", one of Plato's dialogues dating back to the 4th century BCE, employed the plot device we now refer to as a "cliffhanger"?
...that The Entrance Bridge was the site of a 1955 accident when the Number 11 Red Bus's brakes failed, whereupon it crashed through a wooden retaining wall and landed in The Entrance Channel?
...that Austrian figure skater Herma Szabo practiced on the first artificial ice rink ever made, and went on to win five world championships?
...that the Helophilus pendulus (pictured) is a European hoverfly, whose scientific name means "dangling swamp-lover"?

Helophilus pendulus
...that the Oklahoma Aquarium has the world's largest collection of antique fishing tackle, with over 20,000 pieces?
...that the Treaty of Viterbo transferred power over the Latin Empire from the last reigning monarch to the Angevin rulers of Sicily?
...that Perfect Imperfection, a 2004 science fiction novel by Polish writer Jacek Dukaj, raises the issues of technological singularity, transhumanism and the anthropic principle, and presents a unique model of human evolution?
...that Torre HSBC, home of the headquarters of HSBC Mexico, is expected to become the first building in Latin America to receive a LEED certification from the U.S. Green Building Council?
...that Saco Bay on the Maine coast was named in 1525 by the Spanish cartographer Esteban Gómez for the resemblance of its southern pool to the outline of a sack?
...that in 1831, Russian painter Yakov Kolokolnikov-Voronin (pictured) was deemed a "free artist" by the Imperial Academy of Arts?

Yakov Kolokolnikov-Voronin, Self portrait with wife and son, 1820s
...that Information International, Inc. (Triple-I) used the Super Foonly, the world's fastest PDP-10, to render 3D animation for the 1982 film Tron?
...that in the early 1900s, the Spruce Flats Bog in Forbes State Forest, Pennsylvania underwent a forced reversal from forest to bog, and is now slowly returning to a forest?
...that U.S. diplomat Norman Armour disguised himself as a Norwegian courier to help a Russian princess—his future wife—escape the country after the collapse of the Russian Empire?
...that parasocial interaction is a one-sided social relationship between the audience and the performers?
...that Japanese designer Kenzo Takada developed his love for fashion by reading his sisters' magazines as a child?
...that the Persoonia longifolia (pictured), known as the Upright Snottygobble, is a species of tall shrub characterised by its distinctive flakey paper-like dark red bark?

Persoonia longifolia, showing flakey bark
...that during the German occupation of Luxembourg in World War I, over 1% of the Luxembourgian population died fighting for France, even though Luxembourg remained officially neutral?
...that in 1908 Nikolai Panin became Russia's first Olympic champion by winning the figure skating special figures event, the only year in which it was an Olympic event?
...that student development theories are tools used by scholars and teachers in understanding how students gain knowledge?
...that the Pernambucan Revolt of 1817 was a conflict to establish independence for the current Brazilian state of Pernambuco from Portugal?
...that West Liberty Foods provides Subway restaurant franchises with over one million pounds of meat per week?
...that the Newfoundland Tricolour (pictured), a popular but unofficial flag of Newfoundland and Labrador, is one of the oldest flags of North America, and the oldest flag in the world to use the color pink?
...that Henryk Iwański, member of Armia Krajowa Polish resistance in WWII, commanded several incursions into the Warsaw Ghetto in support of the Warsaw Ghetto fighters?
...that Lord Neaves, a judge on the supreme court of Scotland, was quoted by Charles Darwin on evolution, but attributed the concept of evolution to Lord Monboddo, not Darwin?
...that Billy Idol guitarist Steve Stevens created the album Flamenco A Go-Go after seeing flamenco guitarist Paco de Lucía play live, and that the album spans many genres including dance, flamenco, blues and rock?
...that several months after Vasili III of Russia divorced his wife, Solomonia Saburova, on account of her barrenness, she is believed to have given birth to a son, who became the Cossack robber Kudeyar?
...that, in the 1970s, Peter Rawlinson was expected to become the first Roman Catholic Lord Chancellor since Thomas More in 1532?
... that the analysis of the FSH-receptor (pictured) benefited from the work by Gilman and Rodbell for which they won the 1994 Nobel Prize in Medicine and Physiology?

FSH receptor
...that hollowed-out books have been used in bombings, for smuggling, and for covertly photographing people?
...that Celia Rosser, Australian botanical illustrator has the Banksia species Banksia rosserae and the cultivar Banksia canei 'Celia Rosser' named in her honour?
...that both Denmark and Spain have plans to change their succession laws from male primogeniture to equal primogeniture, leaving Luxembourg and the United Kingdom as the only monarchies in the European Union not to have equal primogeniture?
...that a Navy shower is a method of showering that conserves both water and energy?
...that the highest scoring word in Scrabble is OXYPHENBUTAZONE, which uses a bingo, and can theoretically score 1778 in one go?
...that the Coastal Zone Color Scanner provided the first global view of phytoplankton concentrations? (pictured: scan of Tasmania)

false color image showing plankton around Tasmania
...that the rulers of Yogyakarta brought female bedhaya dancers with them into battle?
...that Michał Boym was one of the first Westerners to explore China and an author of many scholarly publications about the Far East?
...that the Confederation of the Equator was a short-lived state established in northeastern Brazil during her struggle for independence from Portugal?
...that there have been several proposals for space advertising projects, including a giant, 1km² billboard visible from Earth?
...that during the Battle of Beecher Island in 1868, 51 U.S. soldiers held out against some 700 Arapaho Indians and their allies for 9 days, surviving on nothing but muddy water and meat from their own fallen horses?
...that total dissolved solids, a class of water pollutants, is useful as an indicator of aquatic biota health, yet harmful to the plumbing of aquaria and hot tubs? (pictured: water with dissolved solids)

Mineral water with Dissolved Solids
...that the New Shepard is a commercial space tourism vehicle designed and assembled by Blue Origin which will start subscale flight testing in 2006?
... that NASCAR driver-turned-broadcaster Phil Parsons is the (16 years) younger brother of 1973 Winston Cup champion Benny Parsons?
...that the Palace of Tau in Reims, France, is named after its shape, which resembles the letter T (tau, in the left|100px?
...that Bennie Owen introduced the forward pass to the southwestern United States as head coach of the Oklahoma Sooners football team?
...that an increasing number of countries are looking to regulate fast food advertising to try to reduce childhood obesity?