The presence of women in science spans the earliest times of the history of science wherein they have made substantial contributions. Historians with an interest in gender and science have researched the scientific endeavors and accomplishments of women, the barriers they have faced, and the strategies implemented to have their work peer-reviewed and accepted in major scientific journals and other publications. The historical, critical, and sociological study of these issues has become an academic discipline in its own right. The involvement of women in medicine occurred in several early Western civilizations, and the study of natural philosophy in ancient Greece was open to women. Women contributed to the proto-science of alchemy in the first or second centuries CE. During the Middle Ages, religious convents were an important place of education for women, and some of these communities provided opportunities for women to contribute to scholarly research. The 11th century saw the emergence of the first universities; women were, for the most part, excluded from university education. Outside academia, botany was the science that benefitted most from women's contributions in early modern times. The attitude toward educating women in medical fields appears to have been more liberal in Italy than elsewhere. The first known woman to earn a university chair in a scientific field of study was eighteenth-century Italian scientist Laura Bassi. Gender roles were largely deterministic in the eighteenth century and women made substantial advances in science. During the nineteenth century, women were excluded from most formal scientific education, but they began to be admitted into learned societies during this period. In the later nineteenth century, the rise of the women's college provided jobs for women scientists and opportunities for education. Marie Curie paved the way for scientists to study radioactive decay and discovered the elements radium and polonium. Working as a physicist and chemist, she conducted pioneering research on radioactive decay and was the first woman to receive a Nobel Prize in Physics and the first person to receive a second Nobel Prize in Chemistry. Sixty women have been awarded the Nobel Prize between 1901 and 2022. Twenty-four women have been awarded the Nobel Prize in physics, chemistry, physiology or medicine.
Cross-cultural perspectives In the 1970s and 1980s, many books and articles about women scientists were appearing. Virtually all of the published sources ignored women of color and women outside of Europe and North America. The formation of the Kovalevskaia Fund in 1985 and the Organization for Women in Science for the Developing World in 1993 gave more visibility to previously marginalized women scientists, but even today there is a dearth of information about current and historical women in science in developing countries. According to academic Ann Hibner Koblitz:
Most work on women scientists has focused on the personalities and scientific subcultures of Western Europe and North America, and historians of women in science have implicitly or explicitly assumed that the observations made for those regions will hold true for the rest of the world. Koblitz has said that these generalizations about women in science often do not hold up cross-culturally:
A scientific or technical field that might be considered 'unwomanly' in one country in a given period may enjoy the participation of many women in a different historical period or in another country. An example is engineering, which in many countries is considered the exclusive domain of men, especially in usually prestigious subfields, such as electrical or mechanical engineering. There are exceptions to this, however. In the former Soviet Union all subspecialties of engineering had high percentages of women, and at the Universidad Nacional de Ingeniería of Nicaragua, women made up 70% of engineering students in 1990.
Historical examples
Ancient history The involvement of women in the field of medicine has been recorded in several early civilizations. An ancient Egyptian physician, Peseshet (c. 2600–2500 B.C.E.), described in an inscription as "lady overseer of the female physicians", is the earliest known female physician named in the history of science. Agamede was cited by Homer as a healer in ancient Greece before the Trojan War (c. 1194–1184 BCE). The study of natural philosophy in ancient Greece was open to women. Recorded examples include Aglaonike, who predicted eclipses; and Theano, mathematician and physician, who was a pupil (possibly also wife) of Pythagoras, and one of the school in Crotone founded by Pythagoras, which included many other women. A passage in Pollux speaks about those who invented the process of coining money, mentioning Pheidon and Demodike from Cyme, wife of the Phrygian king, Midas, and daughter of King Agamemnon of Cyme. A daughter of a certain Agamemnon, king of Aeolian Cyme, married a Phrygian king called Midas. This link may have facilitated the Greeks "borrowing" their alphabet from the Phrygians because the Phrygian letter shapes are closest to the inscriptions from Aeolis. During the period of the Babylonian civilization, around 1200 BCE, two perfumeresses named Tapputi-Belatekallim and -ninu (first half of her name unknown) were able to obtain the essences from plants by using extraction and distillation procedures. During the Egyptian dynasty, women were involved in applied chemistry, such as the making of beer and the preparation of medicinal compounds. Women have been recorded to have made major contributions to alchemy. Many of whom lived in Alexandria around the 1st or 2nd centuries C.E., where the gnostic tradition led to female contributions being valued. The most famous of the women alchemists, Mary the Jewess, is credited with inventing several chemical instruments, including the double boiler (bain-marie); the improvement or creation of distillation equipment of that time. Such distillation equipment was called kerotakis (simple still) and the tribikos (a complex distillation device). Hypatia of Alexandria (c. 350–415 CE), daughter of Theon of Alexandria, was a philosopher, mathematician, and astronomer. She is the earliest female mathematician about whom detailed information has survived. Hypatia is credited with writing several important commentaries on geometry, algebra, and astronomy. Hypatia was the head of a philosophical school and taught many students. In 415 CE, she became entangled in a political dispute between Cyril, the bishop of Alexandria, and Orestes, the Roman governor, which resulted in a mob of Cyril's supporters stripping her, dismembering her, and burning the pieces of her body.
Medieval Europe
The early parts of the European Middle Ages, also known as the Dark Ages, were marked by the decline of the Roman Empire. The Latin West was left with great difficulties that dramatically affected the continent's intellectual production. Although nature was still seen as a system that could be comprehended through reason, there was little innovative scientific inquiry. The Arabic world deserves credit for preserving scientific advancements. Arabic scholars produced original scholarly work and generated copies of manuscripts from classical periods. During this period, Christianity underwent a period of resurgence, and Western civilization was bolstered as a result. This phenomenon was, in part, due to monasteries and nunneries that nurtured the skills of reading and writing, and the monks and nuns who collected and copied important writings by scholars of the past. As it mentioned before, convents were an important place of education for women during this period, for the monasteries and nunneries encourage the skills of reading and writing, and some of these communities provided opportunities for women to contribute to scholarly research. An example is the German abbess Hildegard of Bingen (1098–1179 A.D), a famous philosopher and botanist, whose prolific writings include treatments of various scientific subjects, including medicine, botany and natural history (c. 1151–58). Another famous German abbess was Hroswitha of Gandersheim (935–1000 A.D.) that also helped encourage women to be intellectual. However, with the growth in number and power of nunneries, the all-male clerical hierarchy was not welcomed toward it, and thus it stirred up conflict by having backlash against women's advancement. That impacted many religious orders closed on women and disbanded their nunneries, and overall excluding women from the ability to learn to read and write. With that, the world of science became closed off to women, limiting women's influence in science. Entering the 11th century, the first universities emerged. Women were, for the most part, excluded from university education. However, there were some exceptions. The Italian University of Bologna allowed women to attend lectures from its inception, in 1088. The attitude toward educating women in medical fields in Italy appears to have been more liberal than in other places. The physician Trotula di Ruggiero, is supposed to have held a chair at the Medical School of Salerno in the 11th century, where she taught many noble Italian women, a group sometimes referred to as the "ladies of Salerno". Several influential texts on women's medicine, dealing with obstetrics and gynecology, among other topics, are also often attributed to Trotula. Dorotea Bucca was another distinguished Italian physician. She held a chair of philosophy and medicine at the University of Bologna for over forty years, from 1390. Other Italian women whose contributions in medicine have been recorded include Abella, Jacobina Félicie, Alessandra Giliani, Rebecca de Guarna, Margarita, Mercuriade (14th century), Constance Calenda, Calrice di Durisio (15th century), Constanza, Maria Incarnata and Thomasia de Mattio. Despite the success of some women, cultural biases affecting their education and participation in science were prominent in the Middle Ages. For example, Saint Thomas Aquinas, a Christian scholar, wrote, referring to women, "She is mentally incapable of holding a position of authority."
Scientific Revolutions of 1600s and 1700s
Margaret Cavendish, a seventeenth-century aristocrat, took part in some of the most important scientific debates of that time. She was, however, not inducted into the English Royal Society, although she was once allowed to attend a meeting. She wrote a number of works on scientific matters, including Observations upon Experimental Philosophy (1666) and Grounds of Natural Philosophy. In these works she was especially critical of the growing belief that humans, through science, were the masters of nature. The observations provided a critique of the experimental science of Bacon and criticized microscopes as imperfect machines. Isabella Cortese, an Italian alchemist, is best known for her book I secreti della signora Isabella Cortese or The Secrets of Isabella Cortese. Cortese was able to manipulate nature in order to create several medicinal, alchemy and cosmetic "secrets" or experiments. Isabella's book of secrets belongs to a larger book of secrets that became extremely popular among the elite during the 16th century. Despite the low percentage of literate women during Cortese's era, the majority of alchemical and cosmetic "secrets" in the book of secrets were geared towards women. This included but was not limited to pregnancy, fertility, and childbirth. Sophia Brahe, sister of Tycho Brahe, was a Danish horticulturalist. Brahe was trained by her older brother in chemistry and horticulture but taught herself astronomy by studying books in German. Sophia visited her brother in Uranienborg on numerous occasions and assisted on his project the De nova stella. Her observations led to the discovery of the supernova SN 1572 which helped refute the geocentric model of the universe. In Germany, the tradition of female participation in craft production enabled some women to become involved in observational science, especially astronomy. Between 1650 and 1710, women were 14% of German astronomers. The most famous female astronomer in Germany was Maria Winkelmann. She was educated by her father and uncle and received training in astronomy from a nearby self-taught astronomer. Her chance to be a practicing astronomer came when she married Gottfried Kirch, Prussia's foremost astronomer. She became his assistant at the astronomical observatory operated in Berlin by the Academy of Science. She made original contributions, including the discovery of a comet. When her husband died, Winkelmann applied for a position as an assistant astronomer at the Berlin Academy – for which she had the necessary experience. As a woman – with no university degree – she was denied the post. Members of the Berlin Academy feared that they would establish a bad example by hiring a woman. "Mouths would gape", they said. Winkelmann's problems with the Berlin Academy reflect the obstacles women faced in being accepted in scientific work, which was considered to be chiefly for men. No woman was invited to either the Royal Society of London nor the French Academy of Sciences until the twentieth century. Most people in the seventeenth century viewed a life devoted to any kind of scholarship as being at odds with the domestic duties women were expected to perform. A founder of modern botany and zoology, the German Maria Sibylla Merian (1647–1717), spent her life investigating nature. When she was thirteen, Merian began growing caterpillars and studying their metamorphosis into butterflies. She kept a "Study Book" which recorded her investigations into natural philosophy. In her first publication, The New Book of Flowers, she used imagery to catalog the lives of plants and insects. After her husband died, and her brief stint living in Siewert, she and her daughter journeyed to Paramaribo for two years to observe insects, birds, reptiles, and amphibians. She returned to Amsterdam and published The Metamorphosis of the Insects of Suriname, which "revealed to Europeans for the first time the astonishing diversity of the rain forest." She was a botanist and entomologist who was known for her artistic illustrations of plants and insects. Uncommon for that era, she traveled to South America and Suriname, where, assisted by her daughters, she illustrated the plant and animal life of those regions. Overall, the Scientific Revolution did little to change people's ideas about the nature of women – more specifically – their capacity to contribute to science just as men do. According to Jackson Spielvogel, 'Male scientists used the new science to spread the view that women were by nature inferior and subordinate to men and suited to play a domestic role as nurturing mothers. The widespread distribution of books ensured the continuation of these ideas'.
Eighteenth century
Although women excelled in many scientific areas during the eighteenth century, they were discouraged from learning about plant reproduction. Carl Linnaeus' system of plant classification based on sexual characteristics drew attention to botanical licentiousness, and people feared that women would learn immoral lessons from nature's example. Women were often depicted as both innately emotional and incapable of objective reasoning, or as natural mothers reproducing a natural, moral society. The eighteenth century was characterized by three divergent views towards women: that women were mentally and socially inferior to men, that they were equal but different, and that women were potentially equal in both mental ability and contribution to society. While individuals such as Jean-Jacques Rousseau believed women's roles were confined to motherhood and service to their male partners, the Enlightenment was a period in which women experienced expanded roles in the sciences. The rise of salon culture in Europe brought philosophers and their conversation to an intimate setting where men and women met to discuss contemporary political, social, and scientific topics. While Jean-Jacques Rousseau attacked women-dominated salons as producing 'effeminate men' that stifled serious discourse, salons were characterized in this era by the mixing of the sexes. Lady Mary Wortley Montagu defied convention by introducing smallpox inoculation through variolation to Western medicine after witnessing it during her travels in the Ottoman Empire. In 1718 Wortley Montague had her son inoculated and when in 1721 a smallpox epidemic struck England, she had her daughter inoculated. This was the first such operation done in Britain. She persuaded Caroline of Ansbach to test the treatment on prisoners. Princess Caroline subsequently inoculated her two daughters in 1722. Under a pseudonym, Wortley Montague published an article describing and advocating in favor of inoculation in September 1722. After publicly defending forty nine theses in the Palazzo Pubblico, Laura Bassi was awarded a doctorate of philosophy in 1732 at the University of Bologna. Thus, Bassi became the second woman in the world to earn a philosophy doctorate after Elena Cornaro Piscopia in 1678, 54 years prior. She subsequently defended twelve additional theses at the Archiginnasio, the main building of the University of Bologna which allowed her to petition for a teaching position at the university. In 1732 the university granted Bassi's professorship in philosophy, making her a member of the Academy of the Sciences and the first woman to earn a professorship in physics at a university in Europe But the university held the value that women were to lead a private life and from 1746 to 1777 she gave only one formal dissertation per year ranging in topic from the problem of gravity to electricity. Because she could not lecture publicly at the university regularly, she began conducting private lessons and experiments from home in the year of 1749. However, due to her increase in responsibilities and public appearances on behalf of the university, Bassi was able to petition for regular pay increases, which in turn was used to pay for her advanced equipment. Bassi earned the highest salary paid by the University of Bologna of 1200 lire. In 1776, at the age of 65, she was appointed to the chair in experimental physics by the Bologna Institute of Sciences with her husband as a teaching assistant. According to Britannica, Maria Gaetana Agnesi is "considered to be the first woman in the Western world to have achieved a reputation in mathematics." She is credited as the first woman to write a mathematics handbook, the Instituzioni analitiche ad uso della gioventù italiana, (Analytical Institutions for the Use of Italian Youth). Published in 1748 it "was regarded as the best introduction extant to the works of Euler." The goal of this work was, according to Agnesi herself, to give a systematic illustration of the different results and theorems of infinitesimal calculus. In 1750 she became the second woman to be granted a professorship at a European university. Also appointed to the University of Bologna she never taught there. The German Dorothea Erxleben was instructed in medicine by her father from an early age and Bassi's university professorship inspired Erxleben to fight for her right to practise medicine. In 1742 she published a tract arguing that women should be allowed to attend university. After being admitted to study by a dispensation of Frederick the Great, Erxleben received her M.D. from the University of Halle in 1754. She went on to analyse the obstacles preventing women from studying, among them housekeeping and children. She became the first female medical doctor in Germany.
In 1741–42 Charlotta Frölich became the first woman to be published by the Royal Swedish Academy of Sciences with three books in agricultural science. In 1748 Eva Ekeblad became the first woman inducted into that academy. In 1746 Ekeblad had written to the academy about her discoveries of how to make flour and alcohol out of potatoes. Potatoes had been introduced into Sweden in 1658 but had been cultivated only in the greenhouses of the aristocracy. Ekeblad's work turned potatoes into a staple food in Sweden, and increased the supply of wheat, rye and barley available for making bread, since potatoes could be used instead to make alcohol. This greatly improved the country's eating habits and reduced the frequency of famines. Ekeblad also discovered a method of bleaching cotton textile and yarn with soap in 1751, and of replacing the dangerous ingredients in cosmetics of the time by using potato flour in 1752. Émilie du Châtelet, a close friend of Voltaire, was the first scientist to appreciate the significance of kinetic energy, as opposed to momentum. She repeated and described the importance of an experiment originally devised by Willem 's Gravesande showing the impact of falling objects is proportional not to their velocity, but to the velocity squared. This understanding is considered to have made a profound contribution to Newtonian mechanics. In 1749 she completed the French translation of Newton's Philosophiae Naturalis Principia Mathematica (the Principia), including her derivation of the notion of conservation of energy from its principles of mechanics. Published ten years after her death, her translation and commentary of the Principia contributed to the completion of the Scientific Revolution in France and to its acceptance in Europe. Marie-Anne Pierrette Paulze and her husband Antoine Lavoisier rebuilt the field of chemistry, which had its roots in alchemy and at the time was a convoluted science dominated by George Stahl's theory of phlogiston. Paulze accompanied Lavoisier in his lab, making entries into lab notebooks and sketching diagrams of his experimental designs. The training she had received allowed her to accurately and precisely draw experimental apparatuses, which ultimately helped many of Lavoisier's contemporaries to understand his methods and results. Paulze translated various works about phlogiston into French. One of her most important translation was that of Richard Kirwan's Essay on Phlogiston and the Constitution of Acids, which she both translated and critiqued, adding footnotes as she went along and pointing out errors in the chemistry made throughout the paper. Paulze was instrumental in the 1789 publication of Lavoisier's Elementary Treatise on Chemistry, which presented a unified view of chemistry as a field. This work proved pivotal in the progression of chemistry, as it presented the idea of conservation of mass as well as a list of elements and a new system for chemical nomenclature. She also kept strict records of the procedures followed, lending validity to the findings Lavoisier published.
The astronomer Caroline Herschel was born in Hanover but moved to England where she acted as an assistant to her brother, William Herschel. Throughout her writings, she repeatedly made it clear that she desired to earn an independent wage and be able to support herself. When the crown began paying her for her assistance to her brother in 1787, she became the first woman to do so at a time when even men rarely received wages for scientific enterprises – to receive a salary for services to science. During 1786–97 she discovered eight comets, the first on 1 August 1786. She had unquestioned priority as discoverer of five of the comets and rediscovered Comet Encke in 1795. Five of her comets were published in Philosophical Transactions, a packet of paper bearing the superscription, "This is what I call the Bills and Receipts of my Comets" contains some data connected with the discovery of each of these objects. William was summoned to Windsor Castle to demonstrate Caroline's comet to the royal family. Caroline Herschel is often credited as the first woman to discover a comet; however, Maria Kirch discovered a comet in the early 1700s, but is often overlooked because at the time, the discovery was attributed to her husband, Gottfried Kirch.
Nineteenth century
Early nineteenth century
Science remained a largely amateur profession during the early part of the nineteenth century. Botany was considered a popular and fashionable activity, and one particularly suitable to women. In the later eighteenth and early nineteenth centuries, it was one of the most accessible areas of science for women in both England and North America. However, as the nineteenth century progressed, botany and other sciences became increasingly professionalized, and women were increasingly excluded. Women's contributions were limited by their exclusion from most formal scientific education, but began to be recognized through their occasional admittance into learned societies during this period. Scottish scientist Mary Fairfax Somerville carried out experiments in magnetism, presenting a paper entitled 'The Magnetic Properties of the Violet Rays of the Solar Spectrum' to the Royal Society in 1826, the second woman to do so. She also wrote several mathematical, astronomical, physical and geographical texts, and was a strong advocate for women's education. In 1835, she and Caroline Herschel were the first two women elected as Honorary Members of the Royal Astronomical Society. English mathematician Ada, Lady Lovelace, a pupil of Somerville, corresponded with Charles Babbage about applications for his analytical engine. In her notes (1842–43) appended to her translation of Luigi Menabrea's article on the engine, she foresaw wide applications for it as a general-purpose computer, including composing music. She has been credited as writing the first computer program, though this has been disputed. In Germany, institutes for "higher" education of women (Höhere Mädchenschule, in some regions called Lyzeum) were founded at the beginning of the century. The Deaconess Institute at Kaiserswerth was established in 1836 to instruct women in nursing. Elizabeth Fry visited the institute in 1840 and was inspired to found the London Institute of Nursing, and Florence Nightingale studied there in 1851. In the US, Maria Mitchell made her name by discovering a comet in 1847, but also contributed calculations to the Nautical Almanac produced by the United States Naval Observatory. She became the first woman member of the American Academy of Arts and Sciences in 1848 and of the American Association for the Advancement of Science in 1850. Other notable female scientists during this period include:
in Britain, Mary Anning (paleontologist), Anna Atkins (botanist), Janet Taylor (astronomer), Penelope Steel (cartographer) in France, Marie-Sophie Germain (mathematician), Jeanne Villepreux-Power (marine biologist)
Late 19th century in western Europe The latter part of the 19th century saw a rise in educational opportunities for women. Schools aiming to provide education for girls similar to that afforded to boys were founded in the UK, including the North London Collegiate School (1850), Cheltenham Ladies' College (1853) and the Girls' Public Day School Trust schools (from 1872). The first UK women's university college, Girton, was founded in 1869, and others soon followed: Newnham (1871) and Somerville (1879). The Crimean War (1854–1856) contributed to establishing nursing as a profession, making Florence Nightingale a household name. A public subscription allowed Nightingale to establish a school of nursing in London in 1860, and schools following her principles were established throughout the UK. Nightingale was also a pioneer in public health as well as a statistician. James Barry became the first British woman to gain a medical qualification in 1812, passing as a man. Elizabeth Garrett Anderson was the first openly female Briton to qualify medically, in 1865. With Sophia Jex-Blake, American Elizabeth Blackwell and others, Garret Anderson founded the first UK medical school to train women, the London School of Medicine for Women, in 1874.
Annie Scott Dill Maunder was a pioneer in astronomical photography, especially of sunspots. A mathematics graduate of Girton College, Cambridge, she was first hired (in 1890) to be an assistant to Edward Walter Maunder, discoverer of the Maunder Minimum, the head of the solar department at Greenwich Observatory. They worked together to observe sunspots and to refine the techniques of solar photography. They married in 1895. Annie's mathematical skills made it possible to analyse the years of sunspot data that Maunder had been collecting at Greenwich. She also designed a small, portable wide-angle camera with a 1.5-inch-diameter (38 mm) lens. In 1898, the Maunders traveled to India, where Annie took the first photographs of the Sun's corona during a solar eclipse. By analysing the Cambridge records for both sunspots and geomagnetic storm, they were able to show that specific regions of the Sun's surface were the source of geomagnetic storms and that the Sun did not radiate its energy uniformly into space, as William Thomson, 1st Baron Kelvin had declared. In Prussia women could go to university from 1894 and were allowed to receive a PhD. In 1908 all remaining restrictions for women were terminated. Alphonse Rebière published a book in 1897, in France, entitled Les Femmes dans la science (Women in Science) which listed the contributions and publications of women in science. Other notable female scientists during this period include:
in Britain, Hertha Marks Ayrton (mathematician, engineer), Margaret Huggins (astronomer), Beatrix Potter (mycologist) in France, Dorothea Klumpke-Roberts (American-born astronomer) in Germany, Amalie Dietrich (naturalist), Agnes Pockels (physicist) in Russia and Sweden, Sofia Kovalevskaya (mathematician)
Late nineteenth-century Russians In the second half of the 19th century, a large proportion of the most successful women in the STEM fields were Russians. Although many women received advanced training in medicine in the 1870s, in other fields women were barred and had to go to western Europe – mainly Switzerland – in order to pursue scientific studies. In her book about these "women of the [eighteen] sixties" (шестидесятницы), as they were called, Ann Hibner Koblitz writes:
To a large extent, women's higher education in continental Europe was pioneered by this first generation of Russian women. They were the first students in Zürich, Heidelberg, Leipzig, and elsewhere. Theirs were the first doctorates in medicine, chemistry, mathematics, and biology.
Among the successful scientists were Nadezhda Suslova (1843–1918), the first woman in the world to obtain a medical doctorate fully equivalent to men's degrees; Maria Bokova-Sechenova (1839–1929), a pioneer of women's medical education who received two doctoral degrees, one in medicine in Zürich and one in physiology in Vienna; Julia Lermontova (1846–1919), the first woman in the world to receive a doctoral degree in chemistry; the marine biologist Sofia Pereiaslavtseva (1849–1903), director of the Sevastopol Biological Station and winner of the Kessler Prize of the Russian Society of Natural Scientists; and the mathematician Sofia Kovalevskaia (1850–1891), the first woman in 19th century Europe to receive a doctorate in mathematics and the first to become a university professor in any field.
Late nineteenth century in the United States
In the later nineteenth century the rise of the women's college provided jobs for women scientists, and opportunities for education. Women's colleges produced a disproportionate number of women who went on for PhDs in science. Many coeducational colleges and universities also opened or started to admit women during this period; such institutions included just over 3000 women in 1875, by 1900 numbered almost 20,000. An example is Elizabeth Blackwell, who became the first certified female doctor in the US when she graduated from Geneva Medical College in 1849. With her sister, Emily Blackwell, and Marie Zakrzewska, Blackwell founded the New York Infirmary for Women and Children in 1857 and the first women's medical college in 1868, providing both training and clinical experience for women doctors. She also published several books on medical education for women. In 1876, Elizabeth Bragg became the first woman to graduate with a civil engineering degree in the United States, from the University of California, Berkeley.
Early twentieth century
Europe before World War II Marie Skłodowska-Curie, the first woman to win a Nobel prize in 1903 (physics), went on to become a double Nobel prize winner in 1911, both for her work on radiation. She was the first person to win two Nobel prizes, a feat accomplished by only four others since then. She also was the first woman to teach at Sorbonne University in Paris. Alice Perry is understood to be the first woman to graduate with a degree in civil engineering in the then United Kingdom of Great Britain and Ireland, in 1906 at Queen's College, Galway, Ireland. Lise Meitner played a major role in the discovery of nuclear fission. As head of the physics section at the Kaiser Wilhelm Institute in Berlin she collaborated closely with the head of chemistry Otto Hahn on atomic physics until forced to flee Berlin in 1938. In 1939, in collaboration with her nephew Otto Frisch, Meitner derived the theoretical explanation for an experiment performed by Hahn and Fritz Strassman in Berlin, thereby demonstrating the occurrence of nuclear fission. The possibility that Fermi's bombardment of uranium with neutrons in 1934 had instead produced fission by breaking up the nucleus into lighter elements, had actually first been raised in print in 1934, by chemist Ida Noddack (co-discover of the element rhenium), but this suggestion had been ignored at the time, as no group made a concerted effort to find any of these light radioactive fission products. Maria Montessori was the first woman in Southern Europe to qualify as a physician. She developed an interest in the diseases of children and believed in the necessity of educating those recognized to be ineducable. In the case of the latter she argued for the development of training for teachers along Froebelian lines and developed the principle that was also to inform her general educational program, which is the first the education of the senses, then the education of the intellect. Montessori introduced a teaching program that allowed defective children to read and write. She sought to teach skills not by having children repeatedly try it, but by developing exercises that prepare them. Emmy Noether revolutionized abstract algebra, filled in gaps in relativity, and was responsible for a critical theorem about conserved quantities in physics. One notes that the Erlangen program attempted to identify invariants under a group of transformations. On 16 July 1918, before a scientific organization in Göttingen, Felix Klein read a paper written by Emmy Noether, because she was not allowed to present the paper herself. In particular, in what is referred to in physics as Noether's theorem, this paper identified the conditions under which the Poincaré group of transformations (now called a gauge group) for general relativity defines conservation laws. Noether's papers made the requirements for the conservation laws precise. Among mathematicians, Noether is best known for her fundamental contributions to abstract algebra, where the adjective noetherian is nowadays commonly used on many sorts of objects. Mary Cartwright was a British mathematician who was the first to analyze a dynamical system with chaos. Inge Lehmann, a Danish seismologist, first suggested in 1936 that inside the Earth's molten core there may be a solid inner core. Women such as Margaret Fountaine continued to contribute detailed observations and illustrations in botany, entomology, and related observational fields. Joan Beauchamp Procter, an outstanding herpetologist, was the first woman curator of Reptiles for the Zoological Society of London at London Zoo. Florence Sabin was an American medical scientist. Sabin was the first woman faculty member at Johns Hopkins in 1902, and the first woman full-time professor there in 1917. Her scientific and research experience is notable. Sabin published over 100 scientific papers and multiple books.
United States before and during World War II
Women moved into science in significant numbers by 1900, helped by the women's colleges and by opportunities at some of the new universities. Margaret Rossiter's books Women Scientists in America: Struggles and Strategies to 1940 and Women Scientists in America: Before Affirmative Action 1940–1972 provide an overview of this period, stressing the opportunities women found in separate women's work in science.
In 1892, Ellen Swallow Richards called for the "christening of a new science" – "oekology" (ecology) in a Boston lecture. This new science included the study of "consumer nutrition" and environmental education. This interdisciplinary branch of science was later specialized into what is currently known as ecology, while the consumer nutrition focus split off and was eventually relabeled as home economics, which provided another avenue for women to study science. Richards helped to form the American Home Economics Association, which published a journal, the Journal of Home Economics, and hosted conferences. Home economics departments were formed at many colleges, especially at land grant institutions. In her work at MIT, Ellen Richards also introduced the first biology course in its history as well as the focus area of sanitary engineering. Women also found opportunities in botany and embryology. In psychology, women earned doctorates but were encouraged to specialize in educational and child psychology and to take jobs in clinical settings, such as hospitals and social welfare agencies. In 1901, Annie Jump Cannon first noticed that it was a star's temperature that was the principal distinguishing feature among different spectra. This led to re-ordering of the ABC types by temperature instead of hydrogen absorption-line strength. Due to Cannon's work, most of the then-existing classes of stars were thrown out as redundant. Afterward, astronomy was left with the seven primary classes recognized today, in order: O, B, A, F, G, K, M; that has since been extended.
Henrietta Swan Leavitt first published her study of variable stars in 1908. This discovery became known as the "period-luminosity relationship" of Cepheid variables. Our picture of the universe was changed forever, largely because of Leavitt's discovery. The accomplishments of Edwin Hubble, renowned American astronomer, were made possible by Leavitt's groundbreaking research and Leavitt's Law. "If Henrietta Leavitt had provided the key to determine the size of the cosmos, then it was Edwin Powell Hubble who inserted it in the lock and provided the observations that allowed it to be turned", wrote David H. and Matthew D.H. Clark in their book Measuring the Cosmos. Hubble often said that Leavitt deserved the Nobel for her work. Gösta Mittag-Leffler of the Swedish Academy of Sciences had begun paperwork on her nomination in 1924, only to learn that she had died of cancer three years earlier (the Nobel prize cannot be awarded posthumously). In 1925, Harvard graduate student Cecilia Payne-Gaposchkin demonstrated for the first time from existing evidence on the spectra of stars that stars were made up almost exclusively of hydrogen and helium, one of the most fundamental theories in stellar astrophysics. Canadian-born Maud Menten worked in the US and Germany. Her most famous work was on enzyme kinetics together with Leonor Michaelis, based on earlier findings of Victor Henri. This resulted in the Michaelis–Menten equations. Menten also invented the azo-dye coupling reaction for alkaline phosphatase, which is still used in his