Daphne mezereum, commonly known as the mezereum, February daphne, spurge laurel or spurge olive, is a species of daphne in the flowering plant family Thymelaeaceae, native to most of Europe and western Asia. D. mezereum is very toxic because of the compounds mezerein and daphnin present especially in the berries and twigs. The flowers have a four-lobed pink or light purple (rarely white) perianth and are strongly scented. This D. mezereum flower was photographed in a forest near Keila, Estonia.

Photograph credit: Ivar Leidus

Edmonia Lewis (1844–1907), also known as "Wildfire", was a sculptor of African-American and Native American heritage. Born free from slavery, Lewis spent her childhood in Upstate New York and New Jersey before moving to Boston in 1864 to pursue her career as a sculptor. After training with marble-bust specialist Edward Augustus Brackett, Lewis opened her own studio later in 1864. In 1866, she moved to Rome, Italy, citing "opportunities for art culture" and finding "a social atmosphere where I was not constantly reminded of my color" as reasons for the move. She went on to spend most of her adult career there. Her largest and most significant work was a marble sculpture weighing more than 3,000 pounds (1,400 kg) showing the death of Cleopatra, which was created for the 1876 Centennial Exposition in Philadelphia. This albumen print of Lewis was produced in around 1870 by the German-American photographer Henry Rocher.

Photograph credit: Henry Rocher; restored by Adam Cuerden

The brown-headed cowbird (Molothrus ater) is a small cowbird in the icterid family, Icteridae. It is distinguished from other icterids by its finch-like head and beak and its smaller size. The adult male is iridescent black in color with a brown head, while the adult female is slightly smaller and is dull grey with a pale throat and very fine streaking on the underparts. The brown-headed cowbird is an obligate brood parasite, laying its eggs in the nests of other small perching birds and relying on those birds to raise its young. Its eggs have been documented in the nests of at least 220 host species, including hummingbirds and raptors. This female brown-head cowbird was photographed in Jamaica Bay Wildlife Refuge in New York City.

Photograph credit: Rhododendrites

San Pedro is a composite volcano in northern Chile and one of the tallest active volcanoes in the world. It is part of the Andean Volcanic Belt and, like other Andean volcanoes, was formed by the subduction of the Nazca Plate beneath the South America Plate. San Pedro is formed of two separate edifices, the Old Cone and the Young Cone, and is adjoined to a neighbouring volcano, San Pablo. The Old Cone was active over one hundred thousand years ago and was eventually truncated by a giant landslide that removed its northwestern side. Within the landslide scar lava flows and pyroclastic flows constructed the Young Cone as well as the lateral centre La Poruña. Some eruptions have been reported during historical time, and presently the volcano is fumarolically active. This photograph shows San Pedro in the foreground, with San Pablo visible behind it to the right.

Photograph credit: Diego Delso

The banded demoiselle (Calopteryx splendens) is a species of damselfly in the family Calopterygidae. It is a Eurasian species, occurring from the Atlantic coast eastwards to Lake Baikal and northwestern China. Often found along slow-flowing streams and rivers, it is a common species throughout much of its range. This male banded demoiselle was photographed at Farmoor in Oxfordshire, England, near the River Thames. Males have a dark wing patch that starts at the nodus but can reach up to the wing tip in southern races.

Photograph credit: Charles J. Sharp

Magna Lykseth-Skogman (6 February 1874 – 13 November 1949) was a Norwegian-born Swedish operatic soprano. After making her debut at the Royal Swedish Opera (Kungliga Operan) in 1901 as Santuzza in Cavalleria rusticana, she was engaged there until 1918 and became the company's prima donna. Lykseth performed leading roles in a wide range of operas but is remembered in particular for her Wagnerian interpretations, creating Brünnhilde in the Swedish premieres of Siegfried and Götterdämmerung, as well as Isolde in Tristan und Isolde in 1909. Considered to be one of the most outstanding Swedish opera singers of her generation, she was awarded the Litteris et Artibus, a Swedish royal medal for the arts, in 1907 and became a member of the Royal Swedish Academy of Music in 1912. This 1909 photograph shows Lykseth in costume as Isolde with the Kungliga Operan.

Photograph credit: Atelier Jaeger; restored by Adam Cuerden

Greenpeace is a global campaigning network founded in Canada in 1971. Its goal is to "ensure the ability of the Earth to nurture life in all its diversity", with campaigns focused on issues such as climate change, deforestation, overfishing, commercial whaling, genetic engineering and the anti-war and anti-nuclear movements. It uses direct action, advocacy, research and ecotage to achieve its goals. Greenpeace had its origins in protests staged in the late 1960s against Cannikin, an American underground nuclear weapon test in the tectonically unstable island of Amchitka in Alaska, amid concerns that the test would trigger earthquakes and a tsunami. This 1971 photograph shows the nuclear device that sparked the creation of Greenpeace being lowered into its firing hole for Cannikin.

Photograph credit: United States Atomic Energy Commission; retouched by Kylesenior and Bammesk

The flame robin (Petroica phoenicea) is a small passerine bird native to Australia. It is a moderately common resident of the coolest parts of south-eastern Australia, including Tasmania. It was first described by the French naturalists Jean René Constant Quoy and Joseph Paul Gaimard in 1830 and, like many brightly coloured Australasian robins, it is sexually dimorphic. Measuring 12 to 14 cm (5 to 6 in) long, the flame robin has dark brown eyes and a small thin black bill. The male has a brilliant orange-red chest and throat, and a white patch on the forehead above the bill. Its upper parts are iron-grey with white bars, and its tail black with white tips. The female is a nondescript grey-brown. It mostly breeds in and around the Great Dividing Range, the Tasmanian highlands and islands in Bass Strait. With the coming of cooler autumn weather, most birds disperse to lower and warmer areas. This male flame robin was photographed in Jenolan Caves, New South Wales, Australia.

Photograph credit: John Harrison

Laocoön is an oil painting created between 1610 and 1614 by El Greco, a Greek painter of the Spanish Renaissance. The painting depicts the Greek and Roman mythological story of the deaths of Laocoön, a Trojan priest of Poseidon, and his two sons Antiphantes and Thymbraeus. Laocoön and his sons were strangled by sea serpents, a punishment sent by the gods after Laocoön attempted to warn his countrymen about the Trojan Horse. Although inspired by the recently discovered monumental Hellenistic sculpture Laocoön and His Sons in Rome, El Greco's Laocoön is a product of Mannerism, an artistic movement originating in Italy during the 16th century that countered the artistic ideals of the Renaissance. The painting is now in the National Gallery of Art in Washington, D.C.

Painting credit: El Greco

Chillon Castle is an island castle located on Lake Geneva to the south of Veytaux in Vaud, Switzerland. It is situated at the eastern end of the lake, on the narrow shore between Montreux and Villeneuve, and close to the Fort de Chillon, which is embedded in the neighbouring hillside. The oldest parts of the castle have not been dated definitively, but the first written record of the castle was in 1005. It was built to control the road from Burgundy to the Great St Bernard Pass, on the site of an earlier Roman outpost. From the mid 12th century, the castle became the summer home of the Counts of Savoy, who kept a fleet of ships on Lake Geneva. It was greatly expanded during the 13th century. The castle became a prison in the 16th century, housing among others the Genvois monk François Bonivard, before reverting to being a residence and then again becoming a prison in 1733. Since the end of the 18th century, the castle has been a tourist attraction.

Photograph credit: Giles Laurent

Stellerite is a rare mineral discovered by and named after Georg Wilhelm Steller, a German explorer and zoologist. The mineral has the general formula Ca[Al₂Si₇O₁₈]·7H₂O. Like most rare minerals, there are few commercial uses for stellerite other than as part of mineral collections, although it has been studied along with other zeolites using a dehydration process, to gauge the potential use of their phases as molecular sieves, sorbents, and catalysts. This stellerite crystal measuring 5.5 cm × 4 cm × 2.5 cm (2.17 in × 1.57 in × 0.98 in) was found in Imilchil, Morocco.

Photograph credit: Ivar Leidus

The snakelocks anemone (Anemonia viridis) is a sea anemone found in the eastern Atlantic Ocean and the Mediterranean Sea. The latter population is however sometimes considered a separate species, the Mediterranean snakelocks anemone (Anemonia sulcata). Several species of small animals regularly live in a symbiotic or commensal relationship with the snakelocks anemone, gaining protection from predators by residing among the venomous tentacles. These include the incognito goby, the shrimp Periclimenes aegylios and the Leach's spider crab.

Photograph credit: Diego Delso

The Dale Creek Crossing was a 650-foot (200 m) bridge in the southeastern Wyoming Territory, United States, completed in 1868. It was constructed by the Union Pacific Railroad as part of the first transcontinental railroad. With a maximum height of 150 feet (46 m) and with a necessity of cutting through solid rock on both sides, it was one of the most difficult parts of the line to build. The original bridge was built of wood, and its trestles began swaying in the wind from the opening day. The original bridge was replaced on the 1868 piers in 1876 by an iron bridge, manufactured by the American Bridge Company, and this was dismantled entirely in 1901 when the Union Pacific completed construction of a new alignment over Sherman Hill as part of a reconstruction project which shortened the Overland Route. This photograph of the Dale Creek Crossing was taken during construction in 1868 by the project's official photographer, Andrew J. Russell.

Photograph credit: Andrew J. Russell; restored by Adam Cuerden

Chromolithography is a method of printmaking using multiple colours, stemming from the process of lithography. It became the most successful of several methods of colour printing developed by the 19th century. This image is a chromolithograph of Love or Duty by Gabriele Castagnola, printed by Hangard-Mangué of Paris. The blocks on the lower right-hand side show the nineteen colours of ink used. The image depicts, like many of Castagnola's works, Lucrezia Buti and Filippo Lippi. Lippi, a painter, was in 1458 working in the city of Prato, Italy, where he set about painting a picture for the monastery chapel of Saint Margherita in that city. There he met Lucrezia, a beautiful novice of the order. Lippi asked that she model for the figure of the Virgin Mary, or perhaps Margaret the Virgin. The two began a sexual relationship, and Buti moved into Lippi's home. This relationship resulted in a son, Filippino Lippi, who became a famous painter, and a daughter, Alessandra.

Illustration credit: Gabriele Castagnola; chromolithography by Jehenné; restored by Adam Cuerden

Leland D. Melvin (born February 15, 1964) is an American engineer and retired NASA astronaut. He served on board the Space Shuttle Atlantis as a mission specialist on STS-122, and as mission specialist 1 on STS-129, logging more than 565 cumulative hours in space. He was named NASA's associate administrator for education in 2010 and retired from the agency in 2014. This official NASA portrait of Melvin wearing an orange Advanced Crew Escape Suit was taken in 2009.

Photograph credit: Robert Markowitz

The violet-backed starling (Cinnyricinclus leucogaster) is a relatively small species of starling, common in most of sub-Saharan Africa. It is strongly sexually dimorphic, with the male's iridescent violet plumage contrasting with the heavily streaked brown female. A bird of open woodland, clearings and gallery forests, it feeds in the treetops, with its diet including fruits, seeds and insects. It nests in tree cavities, with green leaves and dung having been recorded as nesting materials. The female incubates the clutch of two to four eggs, and the male helps rear the young until they fledge about three weeks after hatching. This female violet-backed starling, of the subspecies C. l. verreauxi, was photographed in Damaraland, Namibia.

Photograph credit: Charles J. Sharp

The Roman Forum is a rectangular forum (plaza) surrounded by the ruins of several important ancient government buildings in the centre of Rome. Citizens of the ancient city referred to this space, originally a marketplace, as the Forum Magnum, or simply the Forum. It is located in the small valley between the Palatine and Capitoline Hills. Archaeological evidence shows that the site was originally a grassy wetland, which was drained in the 7th century BC with the building of the first structures of the Cloaca Maxima sewer system. The earliest structures in the Forum were discovered in two separate locations: the site of the Comitium and the group of sanctuaries of Regia, House of the Vestals and Domus Publica. Further structures were added over the centuries including the Temple of Saturn (497 BC), the Temple of Castor and Pollux (484 BC) and the Basilica Fulvia (179 BC), followed by major work in the 80s BC, in which the plaza was raised and permanent marble paving stones laid. Further significant work was undertaken by Julius Caesar and Augustus, and the reign of Constantine the Great saw the completion of the construction of the Basilica of Maxentius (AD 312), the last significant expansion of the complex. The Forum today is a sprawling ruin of architectural fragments and intermittent archaeological excavations attracting 4.5 million or more sightseers yearly. This panoramic photograph, taken in 2018 from the Capitoline Museums, shows some of the surviving structures of the Roman Forum, including the Tabularium, the Gemonian stairs, the Tarpeian Rock, and several temples and basilicas.

Photograph credit: Wolfgang Moroder

Echinaster sepositus, also known as the Mediterranean red sea star, is a species of starfish in the Echinasteridae family. It is found in the eastern Atlantic Ocean, including the Mediterranean Sea and the French side of the English Channel, at depths of up to 250 m (820 ft). It has a wide range of habitats including rocky, sandy and muddy bottoms, and sea-grass meadows formed of Posidonia oceanica and Zostera. E. sepositus has five relatively slender arms, with a diameter of up to 20 cm, or occasionally as much as 30 cm. It is a bright orange-red in colour with a soapy surface texture and a surface dotted with evenly spaced pits from which the animal can extend its deep red gills (papula). This E. sepositus individual was photographed in the Atlantic Ocean in Arrábida Natural Park, Portugal.

Photograph credit: Diego Delso

Presidents' Day, officially known as Washington's Birthday at the federal governmental level, is a holiday in the United States celebrated on the third Monday in February. It is often celebrated to honor all those who served as presidents of the United States and, since 1879, has been the federal holiday honoring Founding Father George Washington, who led the Continental Army to victory in the American Revolutionary War, presided at the Constitutional Convention of 1787, and was the first United States president. The portrait of Washington shown here was one of 130 copies that the American painter Gilbert Stuart made of his unfinished Athenaeum Portrait, which is Stuart's most notable work and the basis for the engraving of Washington on the United States one-dollar bill. This copy is in the collection of the Clark Art Institute in Williamstown, Massachusetts.

Painting credit: Gilbert Stuart

Incense is an aromatic biotic material that releases fragrant smoke when burnt. The term is used for either the material or the aroma. Incense is used for aesthetic reasons, religious worship, aromatherapy, meditation, and ceremony. It may also be used as a simple deodorant or insect repellent. This photograph of a worker manufacturing incense sticks was taken in the village of Quảng Phú Cầu, on the outskirts of Hanoi, by the Vietnamese photographer Trần Tuấn Việt. The sticks are set out to dry in bundles after being dipped in the incense solution.

Photograph credit: Trần Tuấn Việt

Mud is a small Himalayan village in the cold desert region of Spiti in Himachal Pradesh, India. In 2011, the village had a population of 213. At an altitude of 3,810 metres (12,500 ft) on the Pin River (a tributary of the Spiti River), the village is located at the base of the Parbati range that towers almost vertically 1,600 metres (5,200 ft) above. Mud is notable geologically for the nearby Muth Formation, which consists of white quartz arenite, which has a thickness of 258 to 300 metres (846 to 984 ft) and is resistant to weathering. This photograph shows the village of Mud with the tall rock strata behind.

Photograph credit: Timothy A. Gonsalves

The spotted dove (Spilopelia chinensis) is a small and somewhat long-tailed bird of the pigeon family, Columbidae, that is a common resident breeding bird across its native range on the Indian subcontinent and in Southeast Asia. The species has been introduced to many parts of the world and feral populations have become established. There are considerable plumage variations across populations within its wide range; for example the populations in India and Sri Lanka are long tailed and buff brown in colour with a white-spotted black collar patch on the back and sides of the neck. This spotted dove was photographed in Kanha National Park, Madhya Pradesh, India.

Photograph credit: Charles J. Sharp

Sergey Stepnyak-Kravchinsky (1851–1895) was a Ukrainian revolutionary mainly known for assassinating General Nikolai Mezentsov, the chief of Russia's Special Corps of Gendarmes and the head of the country's secret police, with a dagger in the streets of Saint Petersburg in 1878. After the killing, he exposed himself to danger by remaining in Russia, and he left the country in the fall of 1878. He settled for a short time in Switzerland, then a favourite resort of revolutionary leaders, and after a few years came to London. He was already known in England for Underground Russia, which had been published in London in 1882. The book was followed by a number of other works on the condition of the Russian peasantry, on nihilism, and on the conditions of life in Russia. Russian anarchist leader Peter Kropotkin, who knew Stepnyak personally, testified to his character: "He was a stranger to the feeling of fear; it was as foreign to him as colors are to a person born blind. He was ready to risk his life every moment. Egotism as well as narrow partisanship was unknown to him; he believed that in a movement to defeat oppression there are always parties and factions with differences of opinion. ... He also could not understand why there should be strife among the various parties, since all are involved in the struggle against a common enemy." This photograph of Stepnyak was taken in the 1880s.

Photograph credit: Elliott & Fry; restored by Adam Cuerden

The lychee (Litchi chinensis) is a tropical tree in the soapberry family, Sapindaceae, which is native to South China, Malaysia, and northern Vietnam. It has also been introduced throughout Southeast Asia, South Asia and in parts of Southern Africa. A tall evergreen tree, it bears small fleshy sweet fruits which feature a dark brown inedible seed, a layer of translucent white fleshy sweet aril, and a pinkish-red, rough-textured soft shell on the outside. The aril has a floral scent and is most often eaten fresh. This photograph, which has been focus-stacked from 15 separate images, shows a whole lychee fruit, an opened fruit, and a seed.

Photograph credit: Ivar Leidus

Anax ephippiger, commonly known as the vagrant emperor, is a species of dragonfly in the family Aeshnidae.

Photograph credit: Joaquim Alves Gaspar

The Grands Boulevards is an oil on canvas painting by Pierre-Auguste Renoir, painted in 1875. The painting illustrates a busy Paris boulevard, showing the effects of the recent renovation of the city by Georges-Eugène Haussmann. It depicts a wide, paved street with a large concrete building to the right of the painting. The influence of impressionism on Renoir can be seen in the painting through the short brush strokes and a seemingly out of focus view. The work is now in the collection of the Philadelphia Museum of Art.

Painting credit: Pierre-Auguste Renoir

The Malaspina Glacier is the largest piedmont glacier in the world, situated at the head of the Alaska Panhandle in the United States. It is about 65 kilometers (40 mi) wide and 45 kilometers (28 mi) long, with an area of 3,900 km² (1,500 sq mi). The glacier is up to 600 meters (2,000 ft) thick in places, with the elevation of its bottom being estimated to be up to 300 meters (980 ft) below sea level. This three-dimensional rendered panoramic map shows the Malaspina Glacier and surrounding area in 2021 – the glacier is at the front and center, with its concentric rings of ice, rubble and meltwater visible. The map was created using a digital elevation model with height samples every 22.5 metres (74 ft) based on United States and Canadian government data. The natural colors represent water, snow and ice, barren land, low vegetation, broadleaf forest, needleleaf forest, and wetland.

Panoramic map credit: Tom Patterson

The scarlet-chested sunbird (Chalcomitra senegalensis) is a species of bird in the sunbird family, Nectariniidae. It is found in many areas of sub-Saharan Africa, and from South Sudan to South Africa. Adult males of this species have a characteristic red–scarlet coloured breast and an iridescent green patch on top of their heads, while the female is dark brown with no supercilium. It inhabits woodland and gardens, at elevations of up to 2,400 metres (7,900 ft). The bird is around 13 to 15 centimetres (5.1 to 5.9 in) in length, with males having a weight of 7.5 to 17.2 grams (0.26 to 0.61 oz) and females weighing 6.8 to 15.3 grams (0.24 to 0.54 oz). This female scarlet-chested sunbird of the subspecies C. s. lamperti was photographed feeding on an Aloe zebrina flower in the Soysambu Conservancy, Kenya.

Photograph credit: Charles J. Sharp

Les Huguenots is an opera in five acts by Giacomo Meyerbeer. One of the most popular and spectacular examples of grand opera, it sets a French-language libretto by Eugène Scribe and Émile Deschamps and premiered in Paris on 29 February 1836. This watercolour illustration shows the costume designs by Eugène Du Faget for the first performance of Les Huguenots. The three roles depicted and the premiere cast, from left to right, are Marguerite (Julie Dorus-Gras), Raoul (Adolphe Nourrit) and Valentine (Cornélie Falcon).

Illustration credit: Eugène Du Faget; restored by Adam Cuerden