Themacaroni penguin (Eudyptes chrysolophus) is aspecies ofpenguin found from theSubantarctic to theAntarctic Peninsula. One of eight species ofcrested penguin, it is very closely related to theroyal penguin, and some authorities consider the two to be a single species. It bears a distinctive yellow crest on its forehead. Its face and upperparts are black and sharply delineated from the white underparts. Adults weigh on average 5.5 kg (12 lb) and are 70 cm (28 in) in length. The male and female are similar in appearance; the male is slightly larger and stronger with a largerbill. Like all penguins, it is flightless, with a streamlined body and wings stiffened and flattened into flippers for a marine lifestyle. (Full article...)
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Thesong thrush (Turdus philomelos) is athrush that breeds across the WestPalearctic. It has brown upperparts and black-spotted cream or buff underparts and has four recognisedsubspecies. Its distinctivesong, which features repeated musical phrases, has frequently been referenced in poetry. (Full article...)
Amargasaurus (/əˌmɑːrɡəˈsɔːrəs/; "La Amarga lizard") is agenus ofsauropoddinosaur from theEarly Cretaceousepoch (129.4–122.46mya) of what is nowArgentina. The only known skeleton was discovered in 1984 and is virtually complete, including a fragmentary skull, makingAmargasaurus one of the best-known sauropods of its epoch.Amargasaurus was firstdescribed in 1991 and contains a single knownspecies,Amargasaurus cazaui. It was a large animal, but small for a sauropod, reaching 9 to 13 meters (30 to 43 feet) in length. Most distinctively, it sported two parallel rows of tall spines down its neck and back, taller than in any other known sauropod. In life, these spines could have stuck out of the body as solitary structures that supported akeratinous sheath. An alternate hypothesis, now more favored, postulates that they could have formed a scaffold supporting askin sail. They might have been used for display, combat, or defense. (Full article...)
TheIndian roller (Coracias benghalensis) is a bird of the familyCoraciidae. It is 30–34 cm (12–13 in) long with a wingspan of 65–74 cm (26–29 in) and weighs 166–176 g (5.9–6.2 oz). The face and throat are pinkish, the head and back are brown, with blue on the rump and contrasting light and dark blue on the wings and tail. The bright blue markings on the wing are prominent in flight. The sexes are similar in appearance. Twosubspecies are recognised. (Full article...)
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Vasa's port bow
Vasa (previouslyWasa) (Swedish pronunciation:[²vɑːsa]ⓘ) is a Swedishwarship built between 1626 and 1628. The ship sank after sailing roughly 1,300 m (1,400 yd) into her maiden voyage on 10 August 1628. She fell into obscurity after most of her valuablebronzecannons were salvaged in the 17th century, until she was located again in the late 1950s in a busy shipping area inStockholm harbor. The ship was salvaged with a largely intact hull in 1961. She was housed in a temporary museum called Wasavarvet ("The Vasa Shipyard") until 1988 and then moved permanently to theVasa Museum in theRoyal National City Park in Stockholm. Between her recovery in 1961 and the beginning of 2025,Vasa has been seen by over 45 million visitors. (Full article...)
Marble portraitherm identified by an inscription as Aspasia, possibly copied from her grave. Aspasia (/æˈspeɪʒ(i)ə,-ziə,-ʃə/;Ancient Greek:ἈσπασίαGreek:[aspasíaː];c. 470 – after 428 BC) was ametic woman inClassical Athens. Born inMiletus, she moved to Athens and began a relationship with the statesmanPericles, with whom she had a son namedPericles the Younger. According to the traditional historical narrative, she worked as acourtesan and was tried forasebeia (impiety), though modern scholars have questioned the factual basis for either of these claims, which both derive from ancient comedy. Though Aspasia is one of the best-attested women from the Greco-Roman world, and the most important woman in the history of fifth-century Athens, almost nothing is certain about her life. (Full article...)
Thecactus wren (Campylorhynchus brunneicapillus) is a species ofwren that isendemic to the deserts of the southwestern United States and northern and central Mexico. It is thestate bird ofArizona, and the largest wren in the United States. Its plumage is brown, with black and white spots as markings. It has a distinctive whiteeyebrow that sweeps to the nape of the neck. The chest is white, whereas the underparts arecinnamon-buff colored. Both sexes appear similar. The tail, as well asflight feathers, are barred in black and white. Theirsong is a loud raspy chirrup; akin in the description of someornithologists to the sound of a car engine that will not start. It is well-adapted to its native desert environment, and the birds can meet their water needs from their diet which consists chiefly of insects, but also of some plant matter. The cactus wren is a poor flier and generally forages for food on the ground. Ornithologists generally recognize sevensubspecies, with the exact taxonomy under dispute. (Full article...)
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Rossomyrmex proformicarum, a species of parasitic ant Aparasitic ant is a type ofant that exploits the social structure of another ant species for its own survival and reproduction. The most common types ofparasitic ants infiltrate acolony of a closely related species by usingpheromones identical to those of the colony's workers to avoid conflict and blend in. The parasite lays eggs alongside existing ones for thehost colony'sworker ants to raise and nurture as their own. Other parasitic ants transport the host colony'spupae andlarvae back to the parasite's colony, where the brood will be raised as their own. The host brood that were transported are unable to differentiate between the parasites and their own colony, and serve as worker ants for the parasites. The earliest parasitic ants most likely evolved 16 million years ago as temporary social parasites (ants that infiltrate a colony and kill the host queen). (Full article...)
Alloxylon flammeum, commonly known as theQueensland tree waratah orred silky oak, is a medium-sized tree of the familyProteaceae found in theQueensland tropical rain forests of northeastern Australia. It has shiny green elliptical leaves up to 18 cm (7.1 in) long, and prominent orange-redinflorescences that appear from August to October, followed by rectangular woody seed pods that ripen in February and March. Juvenile plants have large (up to 25 cm (9.8 in) long) deeply lobed pinnate leaves. Previously known asOreocallis wickhamii, the initial specimen turned out to be a different species to the one cultivated and hence a new scientific name was required. Described formally byPeter Weston andMike Crisp in 1991,A. flammeum was designated thetype species of the genusAlloxylon. This genus contains the four species previously classified inOreocallis that are found in Australasia. (Full article...)
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Birds are a group ofwarm-bloodedtheropoddinosaurs constituting theclassAves, characterised byfeathers, toothlessbeaked jaws, thelaying ofhard-shelled eggs, a highmetabolic rate, a four-chamberedheart, and a strong yet lightweightskeleton. Birds live worldwide and range in size from the 5.5 cm (2.2 in)bee hummingbird to the 2.8 m (9 ft 2 in)common ostrich. There are over 11,000 living species and they are split into 44orders. More than half arepasserine or "perching" birds. Birds havewings whose development varies according to species; the only known groups without wings are the extinctmoa andelephant birds. Wings, which are modifiedforelimbs, gave birds the ability to fly, although further evolution has led to theloss of flight in some birds, includingratites,penguins, and diverseendemic island species. The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird species of aquatic environments, particularlyseabirds and somewaterbirds, have further evolved for swimming. The study of birds is calledornithology. (Full article...)
An illustration of thehelium atom, depicting thenucleus (pink) and theelectron cloud distribution (black). The nucleus (upper right) in helium-4 is in reality spherically symmetric and closely resembles the electron cloud, although for more complicated nuclei this is not always the case. The black bar is oneangstrom (10−10 m or100 pm).
Atoms are the basicparticles of thechemical elements and the fundamental building blocks ofmatter. An atom consists of anucleus ofprotons and generallyneutrons, surrounded by an electromagnetically bound swarm ofelectrons. The chemical elements are distinguished from each other by the number of protons that are in their atoms. For example, any atom that contains 11 protons issodium, and any atom that contains 29 protons iscopper. Atoms with the same number of protons but a different number of neutrons are calledisotopes of the sameelement. (Full article...)
... that several science fiction critics praised "Rock Diver", the first short story by American writerHarry Harrison, for its compelling take on technology for passing through matter?
... thatfiction about impact events typically focuses more on the societal ramifications than on the science?
... that afterUrsula K. Le Guin published her collectionThe Wind's Twelve Quarters, a reviewer called her the "ideal science fiction writer for readers who ordinarily dislike science fiction"?
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A plot ofnormal distribution (or bell-shaped curve) where each band has a width of 1 standard deviation – See also:68–95–99.7 rule. Instatistics, thestandard deviation is a measure of the amount of variation of the values of a variable about itsaverage. A low standarddeviation indicates that the values tend to be close to their average (also called theexpected value orarithmetic mean) of the set, while a high standard deviation indicates that the values are spread out over a wider range. Standard deviation may be abbreviatedSD orstd dev, and is most commonly represented in mathematical texts and equations by the lowercaseGreek letterσ (sigma). (Full article...)
Mickey Mouse, an anthropomorphic mouse and an American cartoon character co-created in 1928 byWalt Disney andUb Iwerks Anthropomorphism (from the Greek words "ánthrōpos" (ἄνθρωπος), meaning "human," and "morphē" (μορφή), meaning "form" or "shape") is the ascribing or depicition ofhuman form, personality, or attributes to non-human entities, often including non-human animals. Infiction, it is specifically the endowing of non-human characters with human-like behaviors, speech, facial expressions, etc; common examples includetalking animals,talking trees,anthropomorphized food, and sentient toys. (Full article...)
Sci-Hub is ashadow library that provides free access to millions ofresearch papers,regardless of copyright, by bypassing publishers'paywalls in various ways. UnlikeLibrary Genesis, it does not provide access to books. Sci-Hub was founded inKazakhstan byAlexandra Elbakyan in 2011, in response to therising 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 most of the scholarly publications with issuedDOI numbers. On 15 July 2022, Sci-Hub reported that its collection comprised 88,343,822 files. Since December 2020, the site has paused uploads due tolegal troubles. (Full article...)
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An Airbus A321neo ofWizz Air, the largest operator of the type
Inbiology,taxonomy (from Ancient Greekτάξις (taxis)'arrangement' and -νομία (-nomia)'method') is thescientific study of naming, defining (circumscribing) and classifying groups of biologicalorganisms based on shared characteristics. Organisms are grouped intotaxa (singular: taxon), and these groups are given ataxonomic 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 aredomain,kingdom,phylum (division is sometimes used in botany in place ofphylum),class,order,family,genus, andspecies. The Swedish botanistCarl Linnaeus is regarded as the founder of the current system of taxonomy, having developed a ranked system known asLinnaean taxonomy for categorizing organisms. (Full article...)
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