Science is a systematic discipline that builds and organises knowledge in the form of testable explanations about nature and society. It is driven by the scientific method: an empirical cycle that typically involves making observations, producing hypotheses, testing them with evidence, and drawing conclusions. Science encompasses this process and the body of knowledge it produces, which the scientific community continuously challenges, validates, and organises. (Full article...)
Sites where Plesiorycteropus has been found. Blue: P.madagascariensis and P.germainepetterae; green: P.madagascariensis; red: Plesiorycteropus, species uncertain.
Plesiorycteropus, also known as the bibymalagasy or Malagasy aardvark, is a recently extinct genus of mammals from Madagascar. Upon its description in 1895, it was classified with the aardvark, but more recent molecular evidence instead suggests that it is most closely related to the tenrecs (a group extant on the island). Two species are currently recognized, the larger P.madagascariensis and the smaller P.germainepetterae. They probably overlapped in distribution, as subfossil remains of both species have been found in the same site. (Full article...)
Subfossil bones described in 1879, including two skulls, a pelvis, and limb bones
The Rodrigues rail (Erythromachus leguati), also known as Leguat's gelinote or Leguat's rail, is an extinct species of the rail family that was endemic to the Mascarene island of Rodrigues. The bird was first documented from life by two accounts from 1691–93 and 1725–26. Subfossil remains were later discovered and correlated with the old accounts in 1874, and the species was named E. leguati in Leguat's honour. It is generally kept in its own genus, Erythromachus, but has sometimes been assigned to the genus Aphanapteryx along with its close relative the red rail (A. bonasia) of Mauritius; their relationship with other rails is unclear. (Full article...)
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male
The turquoise parrot (Neophema pulchella) is a species of parrot in the genus Neophema native to eastern Australia, from south-eastern Queensland, through New South Wales and into north-eastern Victoria. It was described by George Shaw in 1792. A small lightly built parrot at around 20cm (7.9in) long and 40g (1+1⁄2oz) in weight, it exhibits sexual dimorphism. The male is predominantly green with more yellowish underparts and a bright turquoise blue face. Its wings are predominantly blue with red shoulders. The female is generally duller and paler, with a pale green breast and yellow belly, and lacks the red wing patch. (Full article...)
The Tahiti rail, Tahitian red-billed rail, or Pacific red-billed rail (Gallirallus pacificus) is an extinct species of rail that lived on Tahiti. It was first recorded during James Cook's second voyage around the world (1772–1775), on which it was illustrated by Georg Forster and described by Johann Reinhold Forster. No specimens have been preserved. As well as the documentation by the Forsters, there have been claims that the bird also existed on the nearby island of Mehetia. The Tahiti rail appears to have been closely related to, and perhaps derived from, the buff-banded rail, and has also been historically confused with the Tongan subspecies of that bird. (Full article...)
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Adult
The Fiji parrotfinch (Erythrura pealii) is a species of estrildid finchendemic to Fiji that was formerly considered to be a subspecies of the red-headed parrotfinch. This parrotfinch is a small, mainly green bird with a red head and tail and a stubby dark grey bill. It is found in both forested and open habitats, and has adapted well to man-made environments such as grasslands, pasture and gardens. Pairs have a courtship display in which they fly above the trees in an undulating flight, calling constantly. Breeding birds build a domed grass nest with a side entrance, and lay a clutch normally of four white eggs. Newly hatched chicks are naked and pink, with blue balls at the upper and lower corners of the gape, and black markings inside the mouth; older fledglings resemble the adults, but lack the red head colouring. The Fiji parrotfinch eats seeds, especially of grasses, and also readily feeds on insects and nectar. It forms small flocks of up to six birds after the breeding season. (Full article...)
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Male T. t. torquatus in Spain
The ring ouzel (Turdus torquatus) is a mainly European member of the thrush family Turdidae. It is a medium-sized thrush, 23–24 centimetres (9.1–9.4in) in length and weighing 90–138 grams (3.2–4.9oz). The male is predominantly black with a conspicuous white crescent across its breast. Females are browner and duller than males, and young birds may lack the pale chest markings altogether. In all but the northernmost part of its range, this is a high-altitude species, with three subspecies breeding in mountains from Ireland east to Iran. It breeds in open mountain areas with some trees or shrubs, the latter often including juniper and other treeline conifers, rowan, bilberry, heather, and hairy alpenrose. It is a migratory bird, leaving the breeding areas to winter in southern Europe, North Africa and Turkey, typically in mountains with junipers. The typical clutch is 3–6 brown-flecked pale blue or greenish-blue eggs. They are incubated almost entirely by the female, with hatching normally occurring after 13days. The altricial, downy chicks fledge in another 14days and are dependent on their parents for about 12days after fledging. (Full article...)
Oryzomys is a genus of semiaquatic rodents in the tribe Oryzomyini living in southern North America and far northern South America. It includes eight species, two of which—the marsh rice rat (O.palustris) of the United States and O.couesi of Mexico and Central America—are widespread; the six others have more restricted distributions. The species have had eventful taxonomic histories, and most species were at one time included in the marsh rice rat; additional species may be recognized in the future. The name Oryzomys was established in 1857 by Spencer Fullerton Baird for the marsh rice rat and was soon applied to over a hundred species of American rodents. Subsequently, the genus gradually became more narrowly defined until its current contents were established in 2006, when ten new genera were established for species previously placed in Oryzomys. (Full article...)
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Painted turtle (Chrysemys picta)
The painted turtle (Chrysemys picta) is the most widespread native turtle of North America. This turtle is a member of the genus Chrysemys, which is part of the pond turtle family Emydidae. Fossils show that the painted turtle existed 15million years ago. Three regionally based subspecies (the eastern, midland, and western) evolved during the last ice age. The southern painted turtle (C.dorsalis) is alternately considered the only other species in Chrysemys, or another subspecies of C.picta. (Full article...)
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Flatey Island, Western Iceland
The Arctic tern (Sterna paradisaea) is a tern in the familyLaridae. This bird has a circumpolar breeding distribution covering the Arctic and subarctic regions of Europe (as far south as Brittany), Asia, and North America (as far south as Massachusetts). The species is strongly migratory, seeing two summers each year as it migrates along a convoluted route from its northern breeding grounds to the Antarctic coast for the southern summer and back again about six months later. Recent studies have shown average annual round-trip lengths of about 70,900km (38,300nmi) for birds nesting in Iceland and Greenland, and about 48,700km (26,300nmi) for birds nesting in the Netherlands, while an individual from the Farne Islands in Northumberland with a light level geolocator tag covered a staggering 96,000km (52,000nmi) in ten months from the end of one breeding season to the start of the next. These are by far the longest migrations known in the animal kingdom. (Full article...)
Nemegtomaia is a genus of oviraptoriddinosaur from what is now Mongolia that lived in the Late CretaceousPeriod, about 72 to 70million years ago. The first specimen was found in 1996, and became the basis of the new genus and species N. barsboldi in 2004. The original genus name was Nemegtia, but this was changed to Nemegtomaia in 2005, as the former name was preoccupied. The first part of the generic name refers to the Nemegt Basin, where the animal was found, and the second part means "good mother", in reference to the fact that oviraptorids are known to have brooded their eggs. The specific name honours the palaeontologist Rinchen Barsbold. Two more specimens were found in 2007, one of which was found on top of a nest with eggs, but the dinosaur had received its genus name before it was found associated with eggs. (Full article...)
... that Australian Madeleine Steere played water polo professionally in Turkey after studying biomolecular science in the United States?
... that the 1993 Japanese anime OVA Aru Kararu no Isan, despite not having a conclusive ending, has been praised by critics for its use of science-fiction concepts?
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Science is a systematic discipline that builds and organises knowledge in the form of testable explanations about nature and society. It is driven by the scientific method: an empirical cycle that typically involves making observations, producing hypotheses, testing them with evidence, and drawing conclusions. Science encompasses this process and the body of knowledge it produces, which the scientific community continuously challenges, validates, and organises. (Full article...)
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Sci-Hub is a shadow library that provides free access to millions of research papers, regardless of copyright, by bypassing publishers' paywalls in various ways. Unlike Library Genesis, it does not provide access to books. Sci-Hub was founded in Kazakhstan by Alexandra Elbakyan in 2011, in response to the rising costs of research papers behind paywalls. The site is extensively used worldwide. In September 2019, the site's operator(s) said that it served approximately 400,000 requests per day. In addition to its intensive use, Sci-Hub stands out among other shadow libraries because of its easy use and reliability, as well as the enormous size of its collection. A 2018 study estimated that Sci-Hub provided access to almost all scholarly publications. On 15 July 2022, Sci-Hub reported that its collection comprised 88,343,822 files. In December 2020, the site paused uploads due to legal troubles. Since then, the site has archived a much lower fraction of new articles. (Full article...)
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In biology, taxonomy (fromAncient Greekτάξις (taxis)'arrangement'and-νομία (-nomia)'method') is the scientific study of naming, defining (circumscribing) and classifying groups of biological organisms based on shared characteristics. Modern approaches prioritize common ancestry and evolutionary relationships. Organisms are grouped into taxa (singular: taxon), and these groups are given a taxonomic rank; groups of a given rank can be aggregated to form a more inclusive group of higher rank, thus creating a taxonomic hierarchy. The principal ranks in modern use are domain, kingdom, phylum (division is sometimes used in botany in place of phylum), class, order, family, genus, and species. The Swedish botanist Carl Linnaeus is regarded as the founder of the current system of taxonomy, having developed a ranked system known as Linnaean taxonomy for categorizing organisms. (Full article...)
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In classical mechanics, the Laplace–Runge–Lenz vector (LRL vector) is a vector used chiefly to describe the shape and orientation of the orbit of one astronomical body around another, such as a binary star or a planet revolving around a star. For two bodies interacting by Newtonian gravity, the LRL vector is a constant of motion, meaning that it is the same no matter where it is calculated on the orbit; equivalently, the LRL vector is said to be conserved. More generally, the LRL vector is conserved in all problems in which two bodies interact by a central force that varies as the inverse square of the distance between them; such problems are called Kepler problems. (Full article...)
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Global oceanic and terrestrial photoautotroph abundance at Primary production, by SeaWiFS Project (from Wikipedia:Featured pictures/Sciences/Others)
Toroid magnets of the ATLAS detector, by Maximilien Brice, CERN (edited by Bammesk) (from Wikipedia:Featured pictures/Sciences/Others)
Peruvian Andes at United States Exploring Expedition, by Alfred Thomas Agate (edited by Durova) (from Wikipedia:Featured pictures/Sciences/Others)
A patient being treated for COVID-19, by Gustavo Basso (from Wikipedia:Featured pictures/Sciences/Others)
Section of the Large Hadron Collider, by Maximilien Brice (from Wikipedia:Featured pictures/Sciences/Others)
Animation of a water drop, by Chris 73 and Gmaxwell (from Wikipedia:Featured pictures/Sciences/Others)
Archaeologists prospecting Santa Ana Cave at Excavation (archaeology), by Mario modesto (from Wikipedia:Featured pictures/Sciences/Others)
Projectile motion of a bouncing ball at Inelastic collision, by MichaelMaggs (from Wikipedia:Featured pictures/Sciences/Others)
Color cathodoluminescence of a diamond, by Pavel.Somov (from Wikipedia:Featured pictures/Sciences/Others)
Mechanical advantage device, by Prolineserver (edited by Tomia, Ss181292 and Atropos235) (from Wikipedia:Featured pictures/Sciences/Others)
Parallax, by Mila Zinkova (edited by Richard Bartz) (from Wikipedia:Featured pictures/Sciences/Others)
Drop impact on a liquid surface, by José Manuel Suárez (from Wikipedia:Featured pictures/Sciences/Others)
Simulation of liquids with different viscosities, by Synapticrelay (from Wikipedia:Featured pictures/Sciences/Others)
Archaeological excavation at Atapuerca Mountains, by Mario modesto (from Wikipedia:Featured pictures/Sciences/Others)
Nobel Prize in Physics diploma, by Sofia Gisberg (restored by Jebulon) (from Wikipedia:Featured pictures/Sciences/Others)
Vibrating glass beam at Euler–Bernoulli beam theory, by Ben pcc (from Wikipedia:Featured pictures/Sciences/Others)
NASA study on wingtip vortices at Wake turbulence, by Langley Research Center (edited by Fir0002) (from Wikipedia:Featured pictures/Sciences/Others)
Translational motion at Thermodynamic temperature, by Greg L (from Wikipedia:Featured pictures/Sciences/Others)
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