Theyellow warbler (Setophaga petechia) is a species of bird in theNew World warbler family, Parulidae. It is the most widespread species in the diverse genusSetophaga, breeding in almost the whole of North America, the Caribbean, as well as northern South America. It has 35 subspecies, residing in various different habitats. Depending on the subspecies, the yellow warbler may be between 10 and 18 centimetres (3.9 and 7.1 in) long, with a wingspan from 16 to 22 centimetres (6.3 to 8.7 in). It weighs 7 to 25 grams (0.2–0.9 oz). In winter, female and immature birds all have similarly greenish-yellow uppersides and are a duller yellow below, while males acquire breast and sometimes head coloration. This yellow warbler was photographed in theJamaica Bay Wildlife Refuge in New York City, United States.

Photograph credit:Rhododendrites

Francis II (12 February 1768 – 2 March 1835) was the lastHoly Roman Emperor from 1792 to 1806, and the firstEmperor of Austria as Francis I from 1804 to 1835. He was alsoKing of Hungary,Croatia, andBohemia, and served as the first president of theGerman Confederation following its establishment in 1815. Francis was born inFlorence as the eldest son of futureEmperor Leopold II andMaria Luisa of Spain. Leopold became Holy Roman Emperor in 1790 but died two years later, and Francis succeeded him. TheHoly Roman Empire immediately became embroiled in theFrench Revolutionary Wars, the first of which ended in Austrian defeat and the loss of the left bank of theRhine to France. In 1806, afterNapoleon created theConfederation of the Rhine, Francis abdicated as Holy Roman Emperor, which in effect marked the dissolution of the Holy Roman Empire. In 1813, Francis turned against Napoleon and finally defeated him in theWar of the Sixth Coalition, forcing him to abdicate. Francis died in 1835 at the age of 67 and was succeeded by his son,Ferdinand I. This oil portrait on canvas, painted in 1815 byJoseph Kreutzinger, depicts Francis wearing Austrian military uniform with the insignia of various orders. The painting hangs in the Neue Galerie of theUniversalmuseum Joanneum inGraz, Austria.

Painting credit:Joseph Kreutzinger

Ilulissat is the municipal seat and largest town of the municipality ofAvannaata in westernGreenland. It is located on the eastern shore ofDisko Bay, just north of theIlulissat Icefjord World Heritage Site, and approximately 350 km (220 mi) north of theArctic Circle. With a population of 5,149 as of 2025, it is thethird-largest city in Greenland, afterNuuk andSisimiut. The area around the town was inhabited byInuit peoples from prehistoric times, with evidence ofSaqqaq andDorset settlements. Dutch whalers traded extensively with the local population from the 17th century and referred to the area as Maklykout. Ilulissat was later established as a trading post byJacob Severin's company in 1741, and was named in his honor after theBattle of Jacobshavn, in which Danish forces defeated the Dutch whalers. The town was the site of theArctic Ocean Conference in 2008, in which representatives from Canada, Denmark, Norway, Russia and the United States met to discussterritorial claims in the Arctic. This 2024 photograph shows a panorama of Ilulissat taken from the south west.

Photograph credit:Ekrem Canli

Sabellastarte spectabilis, commonly known as the feather duster worm or the fan worm, is a species ofbenthic marinepolychaete worm in the familySabellidae. It is native to tropical waters of the Indian Ocean and the Red Sea but has spread to other parts of the world. It is afilter feeder and inhabits holes and cracks in reefs, rocky shores, coral and lava, under boulders in still water, and in tidal pools and channels exposed to heavy surf.S. spectabilis is buff in colour with purple specks, around 8 centimetres (3 inches) in length and up to 1.2 centimetres (0.5 inches) in width. It lives in a tough, leathery tube covered with fine mud, from which projects a branchial crown of branched tentacles. The worm is popular in aquariums because of its distinctive appearance and its ability to remove organic particles and improve water quality. ThisS. spectabilis worm was photographed in the diving resort of Anilao inMabini, Batangas, in the Philippines.

Photograph credit:Diego Delso

Laura Clay (February 9, 1849 – June 29, 1941) was a leader of the Americanwomen's suffrage movement and the co-founder and first president of theKentucky Equal Rights Association. She was one of the most important suffragists in the South, favoring thestates' rights approach to suffrage. A powerful orator, she was active in the Democratic Party and had important leadership roles in local, state and national politics. In 1920 at theDemocratic National Convention, she was one of two women to be the first women to have their names placed into nomination for the presidency at the convention of a major political party. This photograph by theGerhard Sisters shows Clay in 1916.

Photograph credit:Gerhard Sisters; restored byKentuckian

Paula Modersohn-Becker (8 February 1876 – 20 November 1907) was a pioneering German painter who made significant contributions to the development of modern art in the early 20th century. Born inDresden, she displayed artistic talent from an early age and went on to receive formal training from local painter Bernhard Wiegandt. She then moved to join the Worpswede artists' colony in northern Germany, receiving tuition fromFritz Mackensen. Modersohn-Becker is celebrated for her role in the emergence ofExpressionism and her innovative approach to portraiture andself-portraiture. ThisSelf-Portrait at 6th Wedding Anniversary was painted in 1906 and is now in the collection of thePaula Modersohn-Becker Museum inBremen.

Painting credit:Paula Modersohn-Becker

ThePacific gull (Larus pacificus) is a bird in thegull family, Laridae, native to the coasts of Australia. It is moderately common in a band along the coast betweenCarnarvon, Western Australia, in the west, andSydney in the east, as well asTasmania and other islands off the continent's southern coast. The Pacific gull ranges in length from 58 to 66 centimetres (23 to 26 in), with awingspan of 137 to 157 centimetres (54 to 62 in). Its diet consists of fish and invertebrates, such as crabs,sand flatheads andcephalopods. This Pacific gull of the subspeciesL. p. pacificus was photographed inMoulting Lagoon Important Bird Area, Tasmania.

Photograph credit:Charles J. Sharp

Luge is awinter sport that involves a one- or two-person sled, also known as a luge, on which athletes sled supine (face-up) and feet-first. Lugers control the movement of the sled by shifting their weight or applying pressure with theircalf muscles and shoulders, and can reach speeds of more than 140 km/h (87 mph; 39 m/s). The sport is organised by theInternational Luge Federation andhas been part of the Winter Olympic programme since 1964. This photograph shows the Ukrainian brothers Myroslav and Ivan Lenko training in 2022 inMariazell, Austria, for theLuge World Cup.

Photograph credit:Steffen Prößdorf

Amblyeleotris rubrimarginata is a fish in the familyGobioidei, the gobies. It is found onreefs or inseagrass beds in the western Pacific, fromNew Caledonia to theGreat Barrier Reef and around New Guinea, Indonesia, Malaysia and the Philippines, at depths from 3 to 26 metres (10 to 85 ft). As with otherAmblyeleotris species, it has a symbiotic relationship withalpheid shrimps, with an individual or a pair of gobies sharing a burrow with a pair of shrimps.A. rubrimarginata is up to 8 centimetres (3.1 in) in length, and its background colour is whitish, marked with five vertical brown or orange bars. It is most readily distinguished from its congeners by a row of red spots along the margin of bothdorsal fins and the upper part of thecaudal fin, and also by a prominent black spot just above and behind the eye. ThisA. rubrimarginata fish was photographed at the resort of Anilao inMabini, Batangas, in the Philippines.

Photograph credit:Diego Delso

Ibn Khaldun (1332–1406) was an Arab scholar, historian, philosopher, and sociologist. Born inTunis into an upper-classAndalusian family of Arab descent, his family's high rank enabled him to study with prominent teachers in theMaghreb, where he received a classical Islamic education including the Quran, as well as mathematics, logic, and philosophy. He lost both his parents to theBlack Death at the age of 17. As was traditional for members of his family, Ibn Khaldun then went on to have a career in politics. His best-known book is theMuqaddimah orProlegomena (Introduction). This influenced 17th-century and 19th-century historians such asKâtip Çelebi,Mustafa Naima andAhmed Cevdet Pasha, who used its theories to analyse the growth and decline of theOttoman Empire. Ibn Khaldun is regularly ranked among the most prominent Muslim and Arab scholars and historians in history. This bust of Ibn Khaldun is situated in the entrance of thekasbah inBéjaïa, Algeria.

Sculpture credit: unknown; photographed byReda Kerbouche

Thegray catbird (Dumetella carolinensis) is a species of bird in themimid family, Mimidae. It is native to most of temperate North America east of theRocky Mountains, mostly migrating to the southeastern United States, Mexico, Central America, and the Caribbean in winter. It is gray in color across most of its body, and with a length ranging from 20.5 to 24 cm (8.1 to 9.4 in) and a span of 22 to 30 cm (8.7 to 11.8 in) across the wings. The gray catbird's diet consists mainly ofarthropods andberries, with foraging taking place on the ground inleaf litter, and also in shrubs and trees. This gray catbird was photographed inBrooklyn, New York City, United States.

Photograph credit:Rhododendrites

Euromaidan was a wave ofdemonstrations andcivil unrest inUkraine, which began on 21 November 2013 with large protests inMaidan Nezalezhnosti inKyiv. The protests were sparked byPresidentViktor Yanukovych's sudden decision not to sign theEuropean Union–Ukraine Association Agreement, instead choosing closer ties toRussia and theEurasian Economic Union. The scope of the protests widened to include calls for the resignation of Yanukovych and theAzarov government. The uprising climaxed on 18–20 February 2014, when fierce fighting in Kyiv between Maidan activists and police resulted in thedeaths of almost 100 protesters and 13 police. As a result, Yanukovych and the parliamentary oppositionsigned an agreement on 21 February to bring about an interim unity government, constitutional reforms and early elections. This photograph shows the crowd of protesters in Kyiv on 2 February 2014.

Photograph credit:Ввласенко

Yarrow Mamout was anAfrican-American freedman ofGuinean origin. Born into theFula people in around 1736, Mamout was raised as a Muslim and learned to read and write inArabic as well as his nativeFula language. Captured and enslaved in 1752, he was brought toMaryland on the slave shipElijah and was sold to Samuel Beall, a plantation owner inTakoma Park, Maryland. Mamout was enslaved there for 44 years, beingmanumitted when Beall died in 1796; he immediately purchased and freed his 7-year-old son, Aquilla. Mamout then became a successful businessman. He remained a devout Muslim, refusing to eat pork or drink alcohol and praying regularly. This1819 portrait of Mamout was created by painterCharles Willson Peale and is now in thePhiladelphia Art Museum.

Painting credit:Charles Willson Peale

Choriaster granulatus, the granulated sea star, is a species ofsea star in the familyOreasteridae, and the only species of its genus. It is found both individually and in groups, and resides in theIndo-Pacific region, the Red Sea, Fiji, and theGreat Barrier Reef, at depths of up to 53 metres (174 ft) and temperatures of 24 to 29 °C (75 to 84 °F). It favours sandy habitats with rubble slopes and detritus as well as among corals and sponges.C. granulatus has a convex body and five short arms with rounded tips and is relatively large among sea stars, having a maximum radius of about 27 centimetres (11 in). It is most commonly pale pink with brown papillae radiating out from the centre, but can also exhibit colours ranging from grey to yellow and even red. It is a carnivore, having a diet of small invertebrates such as coral polyps as well as carrion. ThisC. granulatus sea star was photographed off the coast ofZanzibar, Tanzania.

Photograph credit:Diego Delso

Atime-lapse video of theaurora australis, as seen from theInternational Space Station. Aurorae are natural light displays in the sky caused by the collision of energetic charged particles with atoms in the high altitudethermosphere. The particles originate in themagnetosphere andsolar wind and, on Earth, are directed byEarth's magnetic field into the atmosphere.

Video credit:NASA /ISS Expedition 28 crew

The Torment of Saint Anthony is the earliest known painting by the Italian artistMichelangelo, painted in around 1487–1488 when he was only 12 or 13 years old. A copy ofThe Temptation of Saint Anthony, an engraving byMartin Schongauer, it showsSaint Anthony being assailed in the desert by demons, whose temptations he resisted. This was a common medieval subject, included in theGolden Legend and other sources, although this composition shows a later episode where St Anthony, normally flown about the desert supported by angels, was ambushed in mid-air by devils.The Torment of Saint Anthony is in the permanent collection of theKimbell Art Museum inFort Worth, Texas, United States.

Painting credit:Michelangelo

Theblue petrel (Halobaena caerulea) is a small seabird in the familyProcellariidae, the only member of its genus. It is distributed across theSouthern Ocean but breeds at only six known sites, all close to theAntarctic Convergence zone. Itsplumage is predominantly blue-grey, with an "M" banding across its top, which is similar to that of the closely-relatedprion. It also has a white-tipped tail. The blue petrel is 28 cm (11 in) in length with a wing span of 66 cm (26 in), and feeds predominantly on krill as well as other crustaceans, fish, and squid. This blue petrel was photographed off the eastern coast of theTasman Peninsula in Tasmania, Australia.

Photograph credit:JJ Harrison

Wolfgang Amadeus Mozart (27 January 1756 – 5 December 1791) was a prolific and influentialcomposer of theClassical period. Despite his short life, his rapid pace of composition and proficiency from an early age resulted inmore than 800 works representing virtually every Western classical genre of his time. Many of these compositions are acknowledged as pinnacles of thesymphonic,concertante,chamber,operatic, andchoral repertoire. Mozart is widely regarded as one of the greatest composers in the history of Western music, with his music admired for its "melodic beauty, its formal elegance and its richness of harmony and texture". The oil painting, titledPortrait of the Mozart Family, is traditionally attributed toJohann Nepomuk della Croce and was painted around 1780. In the foreground, the painting depicts Mozart and his sisterMaria Anna together playing afortepiano, and their fatherLeopold holding a violin. In the background, their recently deceased motherAnna Maria is depicted in a framed portrait alongside a sculpture ofApollo playing a lyre. The painting was considered by Maria Anna to have the most authenticportrait of her brother, and has inspired further depictions of Mozart. It is currently in the collection of theTanzmeisterhaus Salzburg.

Painting credit: attributed toJohann Nepomuk della Croce

Gurudongmar Lake is aglacial lake located to the north of theHimalayas in thenortheast Indian state ofSikkim. At an elevation of more than 5,150 metres (16,900 feet), it is one of the highest lakes in the world. The lake is fed by glaciers of theKhangchengyao massif and forms the headwaters of theTeesta River. It is considered to be sacred byBuddhists andSikhs. This photograph shows a partially frozen Gurudongmar Lake.

Photograph credit: Yoghya; edited byUnpetitproleX

Hermann Schwarz (25 January 1843 – 30 November 1921) was a Germanmathematician, known for his work incomplex analysis. Between 1867 and 1869, he worked at theUniversity of Halle, then at theSwiss Federal Polytechnic in Zurich. From 1875, Schwarz worked atGöttingen University, dealing with the subjects of complex analysis,differential geometry, and thecalculus of variations. In 1892, he became a member of the Berlin Academy of Science and a professor at theUniversity of Berlin, where his students includedLipót Fejér,Paul Koebe andErnst Zermelo. Schwarz's name is attached to many ideas in mathematics. This photograph of Schwarz, taken around 1890, is in the collection of theETH Library.

Photograph credit: Louis Zipfel; restored byAdam Cuerden

Theredtoothed triggerfish (Odonus niger) is a tropical fish in the family Balistidae, thetriggerfishes. It is native to the tropical Indo-Pacific area, including the Red Sea, the African east coast, theMarquesas Islands and theSociety Islands, across to southern Japan and theGreat Barrier Reef of Australia. Redtoothed triggerfish are normally deep blue or purple with a light blue head. They are omnivorous and mostly opportunistic feeders, with crustaceans as their primary food source. They also feed on zooplankton and algae, and remains of cephalopods and fish have been found in their stomachs. This redtoothed triggerfish was photographed off the coast ofAnilao in the Philippines.

Photograph credit:Diego Delso

Amanda Smith (January 23, 1837 – February 24, 1915) was an AmericanMethodist preacher and formerslave who funded the former Amanda Smith Orphanage and Industrial Home for Abandoned and Destitute Colored Children inHarvey, Illinois. She was a leader in theHoliness movement, preaching the doctrine ofentire sanctification throughout Methodistcamp meetings across the world. This photograph of Smith was taken around 1885 and is in the collection of theNational Portrait Gallery.

Photograph credit: T. B. Latchmore; restored byAdam Cuerden

Pouteria campechiana, also known as the canistel, is anevergreen tree native to southern Mexico, Belize, Guatemala, and El Salvador. It is cultivated in its native countries and has been introduced into several other countries, including Brazil, Taiwan, and the United States. The edible part of the tree is its fruit, which is colloquially known as an egg fruit. The ripe fruit is used in jam and marmalade, on pancakes, and in a milkshake known as "eggfruit nog". This picture shows a wholeP. campechiana fruit.

Photograph:Augustus Binu

Nohkalikai Falls is a 340-foot-tall (100 m) plunge waterfall located in the northeast Indian state ofMeghalaya. It is the tallest plunge waterfall in India and is situated nearCherrapunji, one of thewettest places on Earth. Nohkalikai Falls are fed by the rainwater collected on the summit of a relatively small plateau. Below the falls is a plunge pool with water of an unusual shade of green.

Photograph credit:Vikramjit Kakati

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  Male plum-headed parakeet
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  Female plum-headed parakeet

Theplum-headed parakeet (Psittacula cyanocephala) is a species ofparakeet in the familyPsittacidae. It is endemic to the Indian subcontinent, from the foothills of the Himalayas to southern India and Sri Lanka, and inhabits forests, open woodland, and sometimes city gardens. It is a predominantly green bird, with a length of 33 to 37 centimetres (13 to14+1⁄2 in) and a weight of 55 to 85 grams (2 to 3 oz). The male has a red head which shades to purplish-blue on the back of the crown, nape and cheeks, while the female has a bluish-gray head. The plum-headed parakeet is a gregarious and noisy species with swift twisting flight and a range of raucous calls. It feeds on grains, fruits, flower petals, sometimes also raiding agricultural fields and orchards. It nests in holes, chiselled out by the pair, in tree trunks, and courtship includes bill rubbing and courtship feeding. These male and female plum-headed parakeets were photographed inJim Corbett National Park, in the Indian state ofUttarakhand.

Photograph credit:Giles Laurent

TheLingnan School was an art movement active in the lateQing dynasty andRepublic of China that sought to modernizeChinese painting through borrowing from other artistic traditions. Established by the brothersGao Jianfu andGao Qifeng, together withChen Shuren, the Lingnan School has been considered one of the major art movements of 20th-century Chinese painting. Stylistically, the Lingnan School was marked by a blending of traditional Chinese approaches and Western techniques, as mediated by Japanese understandings. These included matters of lighting and atmosphere, as well as depictions of subjects rarely found in earlier Chinese works. This 1916 work is by Gao Qifeng and is titledThe Roar of the Tiger.

Painting credit:Gao Qifeng

His Girl Friday is a 1940 Americanscrewball comedy film directed byHoward Hawks, starringCary Grant andRosalind Russell and featuringRalph Bellamy andGene Lockhart. It was released byColumbia Pictures on January 18, 1940. The plot centers on a newspaper editor named Walter Burns who is about to lose his ace reporter and ex-wife, Hildy Johnson, newly engaged to another man. Burns suggests they cover one more story together, getting themselves entangled in the case of murderer Earl Williams as Burns desperately tries to win back his wife. The screenplay was adapted from the 1928 playThe Front Page byBen Hecht andCharles MacArthur.

Film credit:Howard Hawks

Aglais io, commonly known as the European peacock, is a colourfulbutterfly in the familyNymphalidae, found in Europe and temperate Asia as far east as Japan. It is resident in much of its range, often wintering in buildings or trees, and therefore often appears quite early in spring. The butterfly lays its eggs in batches of up to 400 at a time, withcaterpillars hatching after about a week. These are shiny black with six rows of barbed spikes and a series of white dots on each segment. At the end of this phase they form achrysalis which is either grey, brown or green, and may have a blackish tinge. ThisA. io caterpillar on astinging nettle was photographed inRuggeller Riet, Liechtenstein.

Photograph credit:Charles J. Sharp

Narbonne Cathedral is a Catholic church located in the town ofNarbonne, France. Dedicated toSaints Justus and Pastor, it was thecathedral of theDiocese of Narbonne until it was merged with theDiocese of Carcassonne under theConcordat of 1801. It is now aco-cathedral of the Diocese of Carcassonne–Narbonne, and was declared aminor basilica in 1886. The first church on the site was a smallConstantinian structure that was erected in 313 and destroyed by fire in 441. A replacement building, erected in 445, fell into ruin and was eventually replaced in 890 by aCarolingian cathedral whose restored steeple remains on the site. Construction on the present Gothic building began in 1272, opening in 1286. It was gradually expanded until 1354, but its size was then limited by the location of the city walls and the rest of the building was never completed, thenave andtransept being notably absent. This photograph shows thechoir of Narbonne cathedral, looking towards the high altar in the background.

Photograph credit:Diego Delso

TheGreat Chicago Fire was aconflagration that burned in the American city ofChicago in October 1871. The fire killed approximately 300 people, destroyed roughly 3.3 square miles (9 km²) of the city (including more than 17,000 structures), and left more than 100,000 residents homeless. It began in a neighborhoodsouthwest of the city center and spread rapidly, amid a long period of hot, dry, windy weather. The fire leapt thesouth branch of theChicago River and destroyed much ofcentral Chicago before crossing themain stem of the river and consuming theNear North Side. ThisCurrier and Ives lithograph, titledChicago in Flames, shows an artist's rendering of the Great Chicago Fire, facing northeast across theRandolph Street Bridge, with thousands of people fleeing on foot and by carriage.

Lithograph credit:Currier and Ives