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Science is a systematic endeavor that builds and organizes knowledge in the form of testable explanations and predictions about the universe.
The earliest written records of identifiable predecessors to modern science come from Ancient Egypt and Mesopotamia from around 3000 to 1200 BCE. Their contributions to mathematics, astronomy, and medicine entered and shaped the Greek natural philosophy of classical antiquity, whereby formal attempts were made to provide explanations of events in the physical world based on natural causes. After the fall of the Western Roman Empire, knowledge of Greek conceptions of the world deteriorated in Western Europe during the early centuries (400 to 1000 CE) of the Middle Ages, but was preserved in the Muslim world during the Islamic Golden Age and later by the efforts of Byzantine Greek scholars who brought Greek manuscripts from the dying Byzantine Empire to Western Europe in the Renaissance.
The recovery and assimilation of Greek works and Islamic inquiries into Western Europe from the 10th to 13th century revived " natural philosophy", which was later transformed by the Scientific Revolution that began in the 16th century as new ideas and discoveries departed from previous Greek conceptions and traditions. The scientific method soon played a greater role in knowledge creation and it was not until the 19th century that many of the institutional and professional features of science began to take shape, along with the changing of "natural philosophy" to "natural science".
Modern science is typically divided into three major branches: natural sciences (e.g., biology, chemistry, and physics), which study the physical world; the social sciences (e.g., economics, psychology, and sociology), which study individuals and societies; and the formal sciences (e.g., logic, mathematics, and theoretical computer science), which study formal systems, governed by axioms and rules. There is disagreement whether the formal sciences are science disciplines, because they do not rely on empirical evidence. Applied sciences are disciplines that use scientific knowledge for practical purposes, such as in engineering and medicine.
New knowledge in science is advanced by research from scientists who are motivated by curiosity about the world and a desire to solve problems. Contemporary scientific research is highly collaborative and is usually done by teams in academic and research institutions, government agencies, and companies. The practical impact of their work has led to the emergence of science policies that seek to influence the scientific enterprise by prioritizing the ethical and moral development of commercial products, armaments, health care, public infrastructure, and environmental protection. ( Full article...)
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The rivalry between Othniel Charles Marsh (left) and Edward Drinker Cope (right) sparked the Bone Wars.
The Bone Wars, also known as the Great Dinosaur Rush, was a period of intense and ruthlessly competitive fossil hunting and discovery during the Gilded Age of American history, marked by a heated rivalry between Edward Drinker Cope (of the Academy of Natural Sciences of Philadelphia) and Othniel Charles Marsh (of the Peabody Museum of Natural History at Yale). Each of the two paleontologists used underhanded methods to try to outdo the other in the field, resorting to bribery, theft, and the destruction of bones. Each scientist also sought to ruin his rival's reputation and cut off his funding, using attacks in scientific publications.
Their search for fossils led them west to rich bone beds in Colorado, Nebraska, and Wyoming. From 1877 to 1892, both paleontologists used their wealth and influence to finance their own expeditions and to procure services and dinosaur bones from fossil hunters. By the end of the Bone Wars, both men had exhausted their funds in the pursuit of paleontological supremacy. ( Full article...)
High-resolution computed tomography images of the lower chest in a 16-year-old boy with diffuse panbronchiolitis
Diffuse panbronchiolitis (DPB) is an inflammatory lung disease of unknown cause. It is a severe, progressive form of bronchiolitis, an inflammatory condition of the bronchioles (small air passages in the lungs). The term diffuse signifies that lesions appear throughout both lungs, while panbronchiolitis refers to inflammation found in all layers of the respiratory bronchioles (those involved in gas exchange). DPB causes severe inflammation and nodule-like lesions of terminal bronchioles, chronic sinusitis, and intense coughing with large amounts of sputum production.
The disease is believed to occur when there is susceptibility, or a lack of immune system resistance, to DPB-causing bacteria or viruses, caused by several genes that are found predominantly in individuals of East Asian descent. The highest incidence occurs among Japanese people, followed by Koreans. DPB occurs more often in males and usually begins around age 40. It was recognized as a distinct new disease in the early 1960s and was formally named diffuse panbronchiolitis in 1969. ( Full article...)
Metabolism ( /məˈtæbəlɪzəm/, from Greek: μεταβολή metabolē, "change") is the set of life-sustaining chemical reactions in organisms. The three main functions of metabolism are: the conversion of the energy in food to energy available to run cellular processes; the conversion of food to building blocks for proteins, lipids, nucleic acids, and some carbohydrates; and the elimination of metabolic wastes. These enzyme-catalyzed reactions allow organisms to grow and reproduce, maintain their structures, and respond to their environments. The word metabolism can also refer to the sum of all chemical reactions that occur in living organisms, including digestion and the transportation of substances into and between different cells, in which case the above described set of reactions within the cells is called intermediary (or intermediate) metabolism.
Metabolic reactions may be categorized as catabolic – the breaking down of compounds (for example, of glucose to pyruvate by cellular respiration); or anabolic – the building up ( synthesis) of compounds (such as proteins, carbohydrates, lipids, and nucleic acids). Usually, catabolism releases energy, and anabolism consumes energy. ( Full article...)
Tylopilus felleus, commonly known as the bitter bolete or the bitter tylopilus, is a fungus of the bolete family. Its distribution includes east Asia, Europe and eastern North America, extending south into Mexico and Central America. A mycorrhizal species, it grows in deciduous and coniferous woodland, often fruiting under beech and oak. Its fruit bodies have convex to flat caps that are some shade of brown, buff or tan and typically measure up to 15 cm (6 in) in diameter. The pore surface is initially white before turning pinkish with age. Like most boletes it lacks a ring and it may be distinguished from Boletus edulis and other similar species by its unusual pink pores and the prominent dark-brown net-like pattern on its stalk.
French mycologist Pierre Bulliard described this species as Boletus felleus in 1788 before it was transferred into the new genus Tylopilus. It is the type species of Tylopilus and the only member of the genus found in Europe. Tylopilus felleus has been the subject of research into bioactive compounds that have been tested for antitumour and antibiotic properties. Although not poisonous it is generally considered inedible owing to its overwhelming bitterness. ( Full article...)
A CT scan showing a pulmonary contusion (red arrow) accompanied by a rib fracture (purple arrow)
A pulmonary contusion, also known as lung contusion, is a bruise of the lung, caused by chest trauma. As a result of damage to capillaries, blood and other fluids accumulate in the lung tissue. The excess fluid interferes with gas exchange, potentially leading to inadequate oxygen levels ( hypoxia). Unlike pulmonary laceration, another type of lung injury, pulmonary contusion does not involve a cut or tear of the lung tissue.
A pulmonary contusion is usually caused directly by blunt trauma but can also result from explosion injuries or a shock wave associated with penetrating trauma. With the use of explosives during World Wars I and II, pulmonary contusion resulting from blasts gained recognition. In the 1960s its occurrence in civilians began to receive wider recognition, in which cases it is usually caused by traffic accidents. The use of seat belts and airbags reduces the risk to vehicle occupants. ( Full article...)
Appaloosa horse
The Appaloosa is an American horse breed best known for its colorful spotted coat pattern. There is a wide range of body types within the breed, stemming from the influence of multiple breeds of horses throughout its history. Each horse's color pattern is genetically the result of various spotting patterns overlaid on top of one of several recognized base coat colors. The color pattern of the Appaloosa is of interest to those who study equine coat color genetics, as it and several other physical characteristics are linked to the leopard complex mutation (LP). Appaloosas are prone to develop equine recurrent uveitis and congenital stationary night blindness; the latter has been linked to the leopard complex.
Artwork depicting prehistoric horses with leopard spotting exists in prehistoric cave paintings in Europe. Images of domesticated horses with leopard spotting patterns appeared in artwork from Ancient Greece and Han dynasty China through the early modern period. In North America, the Nez Perce people of what today is the United States Pacific Northwest developed the original American breed. Settlers once referred to these spotted horses as the "Palouse horse", possibly after the Palouse River, which ran through the heart of Nez Perce country. Gradually, the name evolved into Appaloosa. ( Full article...)
Alloxylon pinnatum, known as Dorrigo waratah, is a tree of the family Proteaceae found in warm-temperate rainforest of south-east Queensland and northern New South Wales in eastern Australia. It has shiny green leaves that are either pinnate (lobed) and up to 30 cm (12 in) long, or lanceolate (spear-shaped) and up to 15 cm (5.9 in) long. The prominent pinkish-red flower heads, known as inflorescences, appear in spring and summer; these are made up of 50 to 140 individual flowers arranged in corymb or raceme. These are followed by rectangular woody seed pods, which bear two rows of winged seeds.
Known for many years as Oreocallis pinnata, it was transferred to the new genus Alloxylon by Peter Weston and Mike Crisp in 1991. This genus contains the four species previously classified in Oreocallis that are found in Australasia. Its terminal globular flowers indicate that the species is pollinated by birds. Classified as near threatened under the Queensland Nature Conservation Act 1992, the Dorrigo waratah has proven difficult to keep alive in cultivation. ( Full article...)
Microscopic image of a Lewy body (arrowhead) in a neuron of the substantia nigra; scale bar=20 microns (0.02mm)
Dementia with Lewy bodies (DLB) is a type of dementia characterized by changes in sleep, behavior, cognition, movement, and regulation of automatic bodily functions. Memory loss is not always an early symptom. The disease worsens over time and is usually diagnosed when cognitive impairment interferes with normal daily functioning. Together with Parkinson's disease dementia, DLB is one of the two Lewy body dementias. It is a common form of dementia, but the prevalence is not known accurately and many diagnoses are missed. The disease was first described by Kenji Kosaka in 1976.
REM sleep behavior disorder (RBD)—in which people lose the muscle paralysis (atonia) that normally occurs during REM sleep and act out their dreams—is a core feature. RBD may appear years or decades before other symptoms. Other core features are visual hallucinations, marked fluctuations in attention or alertness, and parkinsonism ( slowness of movement, trouble walking, or rigidity). A presumptive diagnosis can be made if several disease features or biomarkers are present; the diagnostic workup may include blood tests, neuropsychological tests, imaging, and sleep studies. A definitive diagnosis usually requires an autopsy. ( Full article...)
Persoonia lanceolata, commonly known as lance-leaf geebung, is a shrub native to New South Wales in eastern Australia. It reaches 3 m (10 ft) in height and has smooth grey bark and bright green foliage. Its small yellow flowers grow on racemes and appear in the austral summer and autumn (January to April), followed by green fleshy fruits (known as drupes) which ripen the following spring (September to October). Within the genus Persoonia, P. lanceolata belongs to the lanceolata group of 58 closely related species. It interbreeds with several other species found in its range.
The species is usually found in dry sclerophyll forest on sandstone-based nutrient-deficient soil. It has adapted to a fire-prone environment; plants lost in bushfires can regenerate through a ground-stored seed bank. Seedlings mostly germinate within two years of fires. Several species of native bee of the genus Leioproctus pollinate the flowers. Swamp wallabies are a main consumer of its fruit, and the seeds are spread in wallaby faeces. Its lifespan ranges from 25 to 60 years, though difficulties in propagation have seen low cultivation rates. ( Full article...)
Sadler c. 1915
William Samuel Sadler (June 24, 1875 – April 26, 1969) was an American surgeon, self-trained psychiatrist, and author who helped publish The Urantia Book. The book is said to have resulted from Sadler's relationship with a man through whom he believed celestial beings spoke at night. It drew a following of people who studied its teachings.
A native of Indiana, Sadler moved to Michigan as a teenager to work at the Battle Creek Sanitarium. There he met the physician and health-food promoter John Harvey Kellogg, co-inventor of corn flakes breakfast cereal, who became his mentor. Sadler married Kellogg's niece, Lena Celestia Kellogg, in 1897. He worked for several Christian organizations and attended medical school, graduating in 1906. Sadler practiced medicine in Chicago with his wife, who was also a physician. He joined several medical associations and taught at the McCormick Theological Seminary. Although he was a committed member of the Seventh-day Adventist Church for almost twenty years, he left the denomination after it disfellowshipped his wife's uncle, John Harvey Kellogg, in 1907. Sadler and his wife became speakers on the Chautauqua adult education circuit in 1907, and he became a highly paid, popular orator. He eventually wrote over 40 books on a variety of medical and spiritual topics advocating a holistic approach to health. Sadler extolled the value of prayer and religion but was skeptical of mediums, assisting debunker Howard Thurston, and embraced the scientific consensus on evolution. ( Full article...)
Tutupaca viewed from a southern direction.
Tutupaca is a volcano in the region of Tacna in Peru. It is part of the Peruvian segment of the Central Volcanic Zone, one of several volcanic belts in the Andes. Tutupaca consists of three overlapping volcanoes formed by lava flows and lava domes made out of andesite and dacite, which grew on top of older volcanic rocks. The highest of these is usually reported to be 5,815 metres (19,078 ft) tall and was glaciated in the past.
Several volcanoes in Peru have been active in recent times, including Tutupaca. Their volcanism is caused by the subduction of the Nazca Plate beneath the South America Plate. One of these volcanoes collapsed in historical time, probably in 1802, generating a large debris avalanche with a volume likely exceeding 0.6–0.8 cubic kilometres (0.14–0.19 cu mi) and a pyroclastic flow. The associated eruption was among the largest in Peru for which there are historical records. The volcano became active about 700,000 years ago, and activity continued into the Holocene, but whether there were historical eruptions was initially unclear; some eruptions were instead attributed to the less eroded Yucamane volcano. The Peruvian government plans to monitor the volcano for future activity. Tutupaca features geothermal manifestations with fumaroles and hot springs. ( Full article...)
Murray in 1928
Margaret Alice Murray (13 July 1863 – 13 November 1963) was an Anglo-Indian Egyptologist, archaeologist, anthropologist, historian, and folklorist. The first woman to be appointed as a lecturer in archaeology in the United Kingdom, she worked at University College London (UCL) from 1898 to 1935. She served as president of the Folklore Society from 1953 to 1955, and published widely over the course of her career.
Born to a wealthy middle-class English family in Calcutta, British India, Murray divided her youth between India, Britain, and Germany, training as both a nurse and a social worker. Moving to London, in 1894 she began studying Egyptology at UCL, developing a friendship with department head Flinders Petrie, who encouraged her early academic publications and appointed her junior lecturer in 1898. In 1902–03 she took part in Petrie's excavations at Abydos, Egypt, there discovering the Osireion temple and the following season investigated the Saqqara cemetery, both of which established her reputation in Egyptology. Supplementing her UCL wage by giving public classes and lectures at the British Museum and Manchester Museum, it was at the latter in 1908 that she led the unwrapping of Khnum-nakht, one of the mummies recovered from the Tomb of the Two Brothers – the first time that a woman had publicly unwrapped a mummy. Recognising that British Egyptomania reflected the existence of a widespread public interest in Ancient Egypt, Murray wrote several books on Egyptology targeted at a general audience. ( Full article...)
Lindow Man on display at the British Museum in June 2010
Lindow Man, also known as Lindow II and (in jest) as Pete Marsh, is the preserved bog body of a man discovered in a peat bog at Lindow Moss near Wilmslow in Cheshire, North West England. The remains were found on 1 August 1984 by commercial peat cutters. Lindow Man is not the only bog body to have been found in the moss; Lindow Woman was discovered the year before, and other body parts have also been recovered. The find was described as "one of the most significant archaeological discoveries of the 1980s" and caused a media sensation. It helped invigorate study of British bog bodies, which had previously been neglected.
Dating the body has proven problematic, but it is thought that he was deposited into Lindow Moss, face down, some time between 2 BC and 119 AD, in either the Iron Age or Romano-British period. At the time of death, Lindow Man was a healthy male in his mid-20s, and may have been of high social status as his body shows little evidence of having done heavy or rough physical labour during his lifetime. There has been debate over the reason for his death; his death was violent and perhaps ritualistic. ( Full article...)
Cast of skull at the Natural History Museum of the University of Pisa
Livyatan is an extinct genus of macroraptorial sperm whale containing one known species: L. melvillei. The genus name was inspired by the biblical sea monster Leviathan, and the species name by Herman Melville, the author of the famous novel Moby-Dick about a white bull sperm whale. It is mainly known from the Pisco Formation of Peru during the Tortonian stage of the Miocene epoch, about 9.9–8.9 million years ago (mya); however, finds of isolated teeth from other locations such as Chile, Argentina, California, South Africa and Australia imply that either it or a close relative survived into the Pliocene, around 5 mya, and may have had a global presence. It was a member of a group of macroraptorial sperm whales (or "raptorial sperm whales") and was probably an apex predator, preying on whales, seals and so forth. Characteristically of raptorial sperm whales, Livyatan had functional, enamel-coated teeth on the upper and lower jaws, as well as several features suitable for hunting large prey.
Livyatan's total length has been estimated to be about 13.5–17.5 m (44–57 ft), similar to that of the modern sperm whale (Physeter macrocephalus), making it one of the largest predators known to have existed. The teeth of Livyatan measured 36.2 cm (1.2 ft), and are the largest biting teeth of any known animal, excluding tusks. It is distinguished from the other raptorial sperm whales by the basin on the skull, spanning the length of the snout. The spermaceti organ, contained in that basin is thought to have been used in echolocation and communication, or for ramming prey and other sperm whales. The whale may have interacted with the large extinct shark Megalodon (Otodus megalodon), competing with it for a similar food source. Its extinction was probably caused by a cooling event at the end of the Miocene period causing a reduction in food populations. The geological formation where the whale has been found has also preserved a large assemblage of marine life, such as sharks and marine mammals. ( Full article...)
Golding Bird (9 December 1814 – 27 October 1854) was a British medical doctor and a Fellow of the Royal College of Physicians. He became a great authority on kidney diseases and published a comprehensive paper on urinary deposits in 1844. He was also notable for his work in related sciences, especially the medical uses of electricity and electrochemistry. From 1836, he lectured at Guy's Hospital, a well-known teaching hospital in London and now part of King's College London, and published a popular textbook on science for medical students called Elements of Natural Philosophy.
Having developed an interest in chemistry while still a child, largely through self-study, Bird was far enough advanced to deliver lectures to his fellow pupils at school. He later applied this knowledge to medicine and did much research on the chemistry of urine and of kidney stones. In 1842, he was the first to describe oxaluria, a condition which leads to the formation of a particular kind of stone. ( Full article...)
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Gregor Mendel (1822–1884) was an Austrian monk who is often called the "father of genetics" for his study of the inheritance of traits in pea plants. Mendel showed that there was particular inheritance of traits according to his laws of inheritance.
It was not until the early 20th century that the importance of his ideas were realized. In 1900, his work was rediscovered by Hugo de Vries, Carl Correns, and Erich von Tschermak. His results were quickly replicated, and genetic linkage quickly worked out. Biologists flocked to the theory, while it was not yet applicable to many phenomena, it sought to give a genotypic understanding of heredity which they felt was lacking in previous studies of heredity, which focused on phenotypic approaches.
More did you know...
- ...that Scientists and Engineers for America is an organization focused on promoting sound science in government, and backing political candidates who support science and its applications?
- ...that the 2004 Christmas Eve Snowstorm was the most significant snow event for South Texas since 1895?
- ...that Stanford professor Kate Lorig developed a peer-led chronic disease self management course which is the basis of the Expert Patient Programme of the British National Health Service?
- ...that walking fish can actually skip, crawl, slither, and even climb trees?
- ...that the Thanksgiving 1984 Nor'easter deposited a 197-foot Venezuelan freighter in the backyard of a Palm Beach, Florida socialite, where it remained for several months?
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Science News
- 20 March 2023 –
- Scientists discover a pearling town near Umm Al Quwain, United Arab Emirates. The town is considered to be the oldest ever found in the country, dating back to the 6th century. (Khaleej Times)
- 12 February 2023 – Asteroid impact prediction
- Researchers at the Konkoly Observatory in Hungary discover 2023 CX1, a 1-metre (3.3-foot) asteroid predicted to fall harmlessly as a fireball over the English Channel at 03:00 UTC, making it the seventh asteroid to be discovered before impacting Earth. (JPL Center for NEO Studies)
- 27 January 2023 – Rewilding
- Cheetah reintroduction in India
- South Africa agrees to send twelve cheetahs to India each year for the next eight to ten years to help secure a viable wild population. The Asiatic cheetah went extinct in India in the 1940s due to overhunting and habitat destruction. (BBC News)
- 24 January 2023 – Doomsday Clock
- The Bulletin of the Atomic Scientists announces that the Doomsday Clock has been moved up to 90 seconds before midnight, largely due to the 2022 Russian invasion of Ukraine. (NPR) (CNN)
General images -
Watson and Crick used many aluminium templates like this one, which is the single base Adenine (A), to build a physical model of DNA in 1953. (from History of science)
Portrait of Galileo Galilei by Leoni (from Scientific Revolution)
Clay models of animal livers dating between the nineteenth and eighteenth centuries BCE, found in the royal palace at Mari in what is now Syria (from History of science)
15th-century manuscript of Avicenna's The Canon of Medicine. (from History of science)
The Royal Society had its origins in Gresham College in the City of London, and was the first scientific society in the world. (from Scientific Revolution)
Newton's Opticks or a treatise of the reflections, refractions, inflections and colours of light (from Scientific Revolution)
Alessandro Volta demonstrates the first electrical cell to Napoleon in 1801. (from History of science)
Plato's Academy. 1st century mosaic from Pompeii (from History of science)
Isaac Newton initiated classical mechanics in physics. (from History of science)
Star list with distance information, Uruk (Iraq), 320-150 BCE, the list gives each constellation, the number of stars and the distance information to the next constellation in ells (from History of science)
Matteo Ricci (left) and Xu Guangqi (right) in Athanasius Kircher, La Chine ... Illustrée, Amsterdam, 1670. (from Scientific Revolution)
An ivory set of Napier's Bones, an early calculating device invented by John Napier (from Scientific Revolution)
Title page from The Sceptical Chymist, a foundational text of chemistry, written by Robert Boyle in 1661 (from Scientific Revolution)
Portrait of Johannes Kepler (from Scientific Revolution)
Vesalius's intricately detailed drawings of human dissections in Fabrica helped to overturn the medical theories of Galen. (from Scientific Revolution)
Archimedes used the method of exhaustion to approximate the value of π. (from History of science)
Otto von Guericke's experiments on electrostatics, published 1672 (from Scientific Revolution)
Statue of Roger Bacon at the Oxford University Museum of Natural History (from History of science)
Schematic of the Antikythera mechanism (150–100 BCE). (from History of science)
One of the oldest surviving fragments of Euclid's Elements, found at Oxyrhynchus and dated to c. 100 CE. (from History of science)
Francis Bacon was a pivotal figure in establishing the scientific method of investigation. Portrait by Frans Pourbus the Younger (1617). (from Scientific Revolution)
The atomic bomb ushered in " Big Science" in physics. (from History of science)
Image of veins from William Harvey's Exercitatio Anatomica de Motu Cordis et Sanguinis in Animalibus. Harvey demonstrated that blood circulated around the body, rather than being created in the liver. (from Scientific Revolution)
Isaac Newton's Principia, developed the first set of unified scientific laws. (from Scientific Revolution)
The Ebers Papyrus (c. 1550 BCE) from ancient Egypt (from History of science)
The frontispiece of the Vienna Dioscurides, which shows a set of seven famous physicians (from History of science)
One possible signature of a Higgs boson from a simulated proton–proton collision. It decays almost immediately into two jets of hadrons and two electrons, visible as lines. (from History of science)
Ptolemaic model of the spheres for Venus, Mars, Jupiter, and Saturn. Georg von Peuerbach, Theoricae novae planetarum, 1474. (from Scientific Revolution)
In mid-July 1837 Charles Darwin started his "B" notebook on the Transmutation of Species, and on page 36 wrote "I think" above his first evolutionary tree. (from History of science)
Isaac Newton in a 1702 portrait by Godfrey Kneller (from Scientific Revolution)
Adam Smith wrote The Wealth of Nations, the first modern work of economics (from History of science)
Precession of the perihelion – exaggerated in the case of Mercury, but observed in the case of S2's apsidal precession around Sagittarius A* (from Scientific method)
Lui Hui's Survey of sea island (from History of science)
Diagram from William Gilbert's De Magnete, a pioneering work of experimental science (from Scientific Revolution)
Ancient India was an early leader in metallurgy, as evidenced by the wrought-iron Pillar of Delhi. (from History of science)
The French Academy of Sciences was established in 1666. (from Scientific Revolution)
Air pump built by Robert Boyle. Many new instruments were devised in this period, which greatly aided in the expansion of scientific knowledge. (from Scientific Revolution)
Galileo Galilei, father of modern science. (from History of science)
Alfred Wegener in Greenland in the winter of 1912–13. He is most remembered as the originator of continental drift hypothesis by suggesting in 1912 that the continents are slowly drifting around the Earth. (from History of science)
The scientific method is often represented as an ongoing process. This diagram represents one variant, and there are many others. (from Scientific method)
Model of DNA with David Deutsch, proponent of invariant scientific explanations (2009) (from Scientific method)
The 1698 Savery Engine was the first successful steam engine (from Scientific Revolution)
A modern replica of Han dynasty polymath scientist Zhang Heng's seismometer of 132 CE (from History of science)
Einstein's official portrait after receiving the 1921 Nobel Prize in Physics (from History of science)
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