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Science Information

From Wikipedia

Timeline of the Universe from Big Bang to present
Chronology of the universe as deduced by the prevailing Big Bang theory, a result from science and obtained knowledge

Science (from Latin scientia 'knowledge') [1] is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe. [2] [3]

The earliest roots in the history of science can be traced to Ancient Egypt and Mesopotamia in around 3000 to 1200 BCE. [4]: 3  [5] Their contributions to mathematics, astronomy, and medicine entered and shaped Greek natural philosophy of classical antiquity, whereby formal attempts were made to provide explanations of events in the physical world based on natural causes. [4]: 1–20  [5] 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, [4]: 193–224  but was preserved in the Muslim world during the Islamic Golden Age. [4]: 163–192 

The recovery and assimilation of Greek works and Islamic inquiries into Western Europe from the 10th to 13th century revived " natural philosophy", [4]: 193–253  which was later transformed by the Scientific Revolution that began in the 16th century [6] as new ideas and discoveries departed from previous Greek conceptions and traditions. [4]: 357–368  [7] 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; [8] [9] along with the changing of "natural philosophy" to "natural science." [10]

Modern science is typically divided into three major branches: [11] 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; [12] [13] and the formal sciences (e.g., logic, mathematics, and theoretical computer science), which study formal systems, governed by axioms and rules. [14] [15] There is disagreement whether the formal sciences are science disciplines, [16] [17] [18], because they do not rely on empirical evidence. [19] [17] Applied sciences are disciplines that use scientific knowledge for practical purposes, such as in engineering and medicine. [20] [21] [22]

New knowledge in science is advanced by research from scientists who are motivated by curiosity about the world and a desire to solve problems. [23] [24] Contemporary scientific research is highly collaborative and is usually done by teams in academic and research institutions, [25] government agencies, and companies. [4]: 163–192  [26] The practical impact of their work has led to the emergence of science policies that seek to influence the scientific enterprise by prioritizing the development of commercial products, armaments, health care, public infrastructure, and environmental protection.


The word science has an undisputed origin from the Latin word sciens, meaning "knowing", the present participle of "to know". In Latin, scientia means "knowledge, awareness, understanding", borrowed by the Anglo-Norman language as the suffix -cience, and later borrowed by Middle English as science. [1] In the 19th century, William Whewell coined the term scientist. [27]


Earliest roots

Clay tablet with markings, three columns for numbers and one for ordinals
The Plimpton 322 tablet by the Babylonians records Pythagorean triples, written in about 1800 BCE

Science in a broad sense had existed since ancient history. [28] This is shown by the construction of complex calendars, techniques for making poisonous plants edible, and public works on a national scale. [29] However, no consistent conscious distinction was made between science and other types of ancient knowledge.[ citation needed]

The earliest roots of science can be traced to Ancient Egypt and Mesopotamia. [4]: 1–20  Although the words and concepts of "science" and "nature" were not part of the conceptual landscape at the time, the ancient Egyptians and Mesopotamians made contributions that would later find a place in Greek and medieval science: mathematics, astronomy, and medicine. [30] [4]: 1–20  From the 3rd millennium BCE, the ancient Egyptians developed a decimal numbering system,[ citation needed] solved practical problems using geometry, and developed the first accurate calendar. Their healing therapies involved drug treatments and the supernatural, such as prayers, incantations, and rituals. [4]: 1–20 

The ancient Mesopotamians used knowledge about the properties of various natural chemicals for manufacturing pottery, faience, glass, soap, metals, lime plaster, and waterproofing. [31] They studied animal physiology, anatomy, behavior, and astrology for divinatory purposes. [32] The Mesopotamians had an intense interest in medicine [31] and the earliest medical prescriptions appeared in Sumerian during the Third Dynasty of Ur. [33] They seem to study scientific subjects which have practical or religious applications and have little interest of satisfying curiosity. [31]

Classical antiquity

Framed mosaic of philosophers gathering around and conversing
Plato's Academy mosaic, made between 100 BCE to 79 AD, shows many Greek philosophers and scholars

In classical antiquity, there is no real ancient analog of a modern scientist. Instead, well-educated, usually upper-class, and almost universally male individuals performed various investigations into nature whenever they could afford the time. [34] Before the invention or discovery of the concept of phusis or nature by the pre-Socratic philosophers, the same words tend to be used to describe the natural "way" in which a plant grows,[ citation needed] and the "way" in which, for example, one tribe worships a particular god. For this reason, it is claimed that these men were the first philosophers in the strict sense and the first to clearly distinguish "nature" and "convention". [35]: 209 

The early Greek philosophers of the Milesian school, which was founded by Thales of Miletus and later continued by his successors Anaximander and Anaximenes, were the first to attempt to explain natural phenomena without relying on the supernatural. [36] The Pythagoreans developed a complex number philosophy [37]: 467–68  and contributed significantly to the development of mathematical science. [37]: 465  The theory of atoms was developed by the Greek philosopher Leucippus and his student Democritus. [38] [39] The Greek doctor Hippocrates established the tradition of systematic medical science [40] [41] and is known as " The Father of Medicine". [42]

A turning point in the history of early philosophical science was Socrates' example of applying philosophy to the study of human matters, including human nature, the nature of political communities, and human knowledge itself. The Socratic method as documented by Plato's dialogues is a dialectic method of hypothesis elimination: better hypotheses are found by steadily identifying and eliminating those that lead to contradictions. The Socratic method searches for general commonly-held truths that shape beliefs and scrutinizes them for consistency. [43]: 17  Socrates criticized the older type of study of physics as too purely speculative and lacking in self-criticism. [43]: 27 

Aristotle in the 4th century BCE created a systematic program of teleological philosophy. [44] In the 3rd century BCE, Greek astronomer Aristarchus of Samos was the first to propose a heliocentric model of the universe, with the Sun at the center and all the planets orbiting it. [45] Aristarchus's model was widely rejected because it was believed to violate the laws of physics, [45] while Ptolemy's Almagest, which contains a geocentric description of the Solar System, was accepted through the early Renaissance instead. [46] [47] The inventor and mathematician Archimedes of Syracuse made major contributions to the beginnings of calculus. [48] Pliny the Elder was a Roman writer and polymath, who wrote the seminal encyclopedia Natural History. [49] [50] [51]


Picture of a peacock on very old paper
The first page of Vienna Dioscurides depicts a peacock, made in the 6th century

Due to the collapse of the Western Roman Empire, the 5th century saw an intellectual decline in western Europe. [4]: 307, 311, 363, 402  During the period, Latin encyclopedists such as Isidore of Seville preserved the majority of general ancient knowledge. [52] In contrast, because Byzantine Empire resisted attacks from invaders, they were able to preserve and improve prior learning. John Philoponus, a Byzantine scholar in the 500s, started to question Aristotle's teaching of physics, noting its flaws. [4]: 307, 311, 363, 402  His criticism served as an inspiration to medieval scholars and Galileo Galilei, who ten centuries later extensively cited his works. [4]: 132–162  [53]

During late antiquity and the early Middle Ages, natural phenomena were mainly examined via the Aristotelian approach. The approach includes Aristotle's four causes: material, formal, moving, and final cause. [54] Many Greek classical texts were preserved Byzantine empire, and Arabic translations were done by groups such as the Nestorians and the Monophysites. Under the Caliphate, these Arabic translations were later improved and developed by Arabic scientists. [55] By the 6th and 7th centuries, the neighboring Sassanid Empire established the medical Academy of Gondeshapur, which is considered by Greek, Syriac, and Persian physicians as the most important medical center of the ancient world. [56]

The House of Wisdom was established in Abbasid-era Baghdad, Iraq, [57] where the Islamic study of Aristotelianism flourished [58] [59] until the Mongol invasions in the 13th century. Ibn al-Haytham, better known as Alhazen, began experimenting as a means to gain knowledge [60]: 463–465  [61]: 59  and disproved Ptolemy's theory of vision [62]: Book I, [6.54]. p. 372  Avicenna's compilation of the Canon of Medicine, a medical encyclopedia, is considered to be one of the most important publications in medicine and used until the 18th century. [63]

By the eleventh century, most of Europe had recovered from the Western Roman Empire collapse and become Christian. [4]: 193–224  In 1088, the University of Bologna, the first university in Europe, emerged. [64] As such, demand for Latin translation of ancient and scientific texts grew, [4]: 193–224  a major contributor to the Renaissance of the 12th century. The Renaissance cause Scholasticism in western Europe flourished, making it the new geographic center of science. Experiments at the time were done by observing, describing, and classifying subjects in nature. [65] In the 13rd century, medical teachers and students at Bologna began opening human bodies, leading to the first anatomy textbook based on human dissection by Mondino de Luzzi. [66]


Drawing of planets' orbit around the Sun
Drawing of the heliocentric model as proposed by the Copernicus's De revolutionibus orbium coelestium

New developments in optics played a role in the inception of the Renaissance, both by challenging long-held metaphysical ideas on perception, as well as by contributing to the improvement and development of technology such as the camera obscura and the telescope. At the start of the Renaissance, Roger Bacon, Vitello, and John Peckham each built up a scholastic ontology upon a causal chain beginning with sensation, perception, and finally apperception of the individual and universal forms of Aristotle. [62]: Book I  A model of vision later known as perspectivism was exploited and studied by the artists of the Renaissance. This theory uses only three of Aristotle's four causes: formal, material, and final. [67]

In the sixteenth century, Nicolaus Copernicus formulated a heliocentric model of the Solar System, stating that the planets revolve around the Sun, instead of the geocentric model where the planets and the Sun revolve around the Earth. This was based on a theorem that the orbital periods of the planets are longer as their orbs are farther from the centre of motion, which he found not to agree with Ptolemy's model. [68]

Johannes Kepler and others challenged the notion that the only function of the eye is perception, and shifted the main focus in optics from the eye to the propagation of light. [67] [61]: 102  Kepler is best known, however, for improving Copernicus' heliocentric model through the discovery of Kepler's laws of planetary motion. Kepler did not reject Aristotelian metaphysics and described his work as a search for the Harmony of the Spheres. [69] Galileo had made significant contributions to astronomy, physics and engineering. However, he became persecuted after Pope Urban VIII sentenced him for writing about the heliocentric model. [70]

In Northern Europe, the new technology of the printing press was widely used to publish scholarly arguments, including some that disagreed widely with contemporary ideas of nature. René Descartes and Francis Bacon published philosophical arguments in favor of a new type of non-Aristotelian science. Descartes emphasized individual thought and argued that mathematics rather than geometry should be used to study nature. Bacon emphasized the importance of experiment over contemplation, questioned the Aristotelian concepts of formal and final cause, promoted the idea that science should study the laws of nature and the improvement of all human life. [71]

Age of Enlightenment

see caption
Title page of the Principia by Issac Newton

As a precursor to the Age of Enlightenment, Isaac Newton and Gottfried Wilhelm Leibniz succeeded in developing classical mechanics, which could be confirmed by experiment and explained using mathematics, such as in the Philosophiæ Naturalis Principia Mathematica. Leibniz incorporated terms from Aristotelian physics, but now being used in a new non-teleological way. This implied a shift in the view of objects: objects were now considered as having no innate goals. Leibniz assumed that different types of things all work according to the same general laws of nature, with no special formal or final causes. [72]

During this time, the declared purpose and value of science became producing wealth and inventions that would improve human lives, in the materialistic sense of having more food, clothing, and other things. In Bacon's words, "the real and legitimate goal of sciences is the endowment of human life with new inventions and riches", and he discouraged scientists from pursuing intangible philosophical or spiritual ideas, which he believed contributed little to human happiness beyond "the fume of subtle, sublime, or pleasing speculation". [73]

Science during the Enlightenment was dominated by scientific societies [74] and academies, which had largely replaced universities as centers of scientific research and development. Societies and academies were the backbones of the maturation of the scientific profession. Another important development was the popularization of science among an increasingly literate population. [75]: 82–83  Enlightenment philosophers chose a short history of scientific predecessors – Galileo, Boyle, and Newton principally – as the guides to every physical and social field of the day. In this respect, the lessons of history and the social structures built upon it could be discarded. [76]

The 18th century saw significant advancements in the practice of medicine, mathematics, and physics; the development of biological taxonomy; a new understanding of magnetism and electricity; and the maturation of chemistry as a discipline.[ citation needed] Ideas on human nature, society, and economics evolved during the Enlightenment. Hume and other Scottish Enlightenment thinkers developed A Treatise of Human Nature, [77] which was expressed historically in works by authors including James Burnett, Adam Ferguson, John Millar and William Robertson, all of whom merged a scientific study of how humans behaved in ancient and primitive cultures with a strong awareness of the determining forces of modernity. Modern sociology largely originated from this movement. [78] In 1776, Adam Smith published The Wealth of Nations, which is often considered the first work on modern economics. [79]

19th century

Sketch of a map with captions
The first diagram of an evolutionary tree made by Charles Darwin in 1837

During the nineteenth century, many distinguishing characteristics of contemporary modern science began to take shape. Some of them are: the transformation of the life and physical sciences, frequent use of precision instruments, emergence of terms such as "biologist", "physicist", "scientist", increased professionalization of those studying nature, scientists gained cultural authority over many dimensions of society, industrialization of numerous countries, thriving of popular science writings and emergence of science journals. [80] During the late 19th century, psychology emerged as a separate discipline from philosophy when Wilhelm Wundt founded the first laboratory for psychological research in 1879. [81]

During the mid-19th century, Charles Darwin and Alfred Russel Wallace independently proposed the theory of evolution by natural selection in 1858, which explained how different plants and animals originated and evolved. Their theory was set out in detail in Darwin's book On the Origin of Species, which was published in 1859. [82] Separately, Gregor Mendel presented his paper, " Experiments on Plant Hybridization" in 1865, [83] which outlined the principles of biological inheritance, serving as the basis for modern genetics. [84]

Early in the 19th century, John Dalton suggested the modern atomic theory, based on Democritus's original idea of indivisible particles called atoms. The laws of conservation of energy, conservation of momentum and conservation of mass suggested a highly stable universe where there could be little loss of resources. With the advent of the steam engine and the industrial revolution, there was, however, an increased understanding that not all forms of energy as defined in physics were equally useful: they did not have the same qualities. This realization led to the development of the laws of thermodynamics, in which the free energy of the universe is seen as constantly declining: the entropy of a closed universe increases over time.[ citation needed]

The electromagnetic theory was established in the 19th century by the works of Hans Christian Ørsted, André-Marie Ampère, Michael Faraday, James Clerk Maxwell, Oliver Heaviside, and Heinrich Hertz. The new theory raised questions that could not easily be answered using Newton's framework. The discovery of X-rays inspired the discovery of radioactivity by Henri Becquerel and Marie Curie in 1896, [85] Marie then become the first person to won two Nobel prizes. [86] In the next year came the discovery of the first subatomic particle, the electron. [87]

20th century

Graph showing lower ozone concentration at the South Pole
First global view of the ozone hole in 1983, using a space telescope

In the first half of the century, the development of antibiotics and artificial fertilizers have improve human standard of living globally. [88] [89] Harmful environmental issues such as ozone depletion, acidification, eutrophication and climate change came to the public's attention in the same period, and caused the onset of environmental science and environmental technology.

During the period, science experiment became increasingly larger in scale and funding. [90] The extensive use of technological innovation stimulated by the wars of this century led to technological advancements and competitions between global powers: Space Race [91]: 3–5  and nuclear arms race.

The century also saw fundamental changes within science disciplines. Evolution became a unified theory in the early 20th-century when the modern synthesis reconciled Darwinian evolution with classical genetics. [92] Albert Einstein's theory of relativity and the development of quantum mechanics led to the replacement of classical mechanics with a new physics which contains two parts that describe different types of events in nature.

In the late 20th century, active recruitment of women and elimination of sex discrimination greatly increased the number of women scientists, but large gender disparities remain in some fields. [93] The discovery of the cosmic microwave background radiation in 1964 led to a rejection of the steady-state model of the universe in favor of the Big Bang theory of Georges Lemaître.

Widespread use of integrated circuits in the last quarter of the 20th century combined with communications satellites led to a revolution in information technology and the rise of the global internet and mobile computing, including smartphones. The need for mass systematization of long, intertwined causal chains and large amounts of data led to the rise of the fields of systems theory and computer-assisted scientific modeling. [94]

21st century

Fuzzy donut-shaped blob on a black background
Radio light image of M87* black hole, made by the earth-spanning Event Horizon Telescope array in 2019

The Human Genome Project was completed in 2003, determining the sequence of nucleotide base pairs that make up human DNA, and identifying and mapping all of the genes of the human genome. [95] The first induced pluripotent human stem cells were made in 2006, allowing adult cells to be transformed into stem cells and turn to any cell type found in the body. [96]

With the discovery of the Higgs boson in 2012, the last particle predicted by the Standard Model of particle physics was found. In 2015, gravitational waves, predicted by general relativity a century before, were first observed.[ citation needed] In 2019, the Event Horizon Telescope Observatory announced its first results in simultaneous press conferences around the world on April 10, 2019, [97] presenting the first direct image of a black hole. The captured supermassive black hole is at the center of galaxy Messier 87, 55 million light-years away from Earth. [98]


Modern science is commonly divided into three major branches: natural science, social science, and formal science. [11] Each of these branches comprises various specialized yet overlapping scientific disciplines that often possess their own nomenclature and expertise. [99] Both natural and social sciences are empirical sciences, [100] as their knowledge is based on empirical observations and is capable of being tested for its validity by other researchers working under the same conditions. [101]


Natural science is the study of the physical world. It can be divided into two main branches: life science and physical science. These two branches may be further divided into more specialized disciplines. For example, physical science can be subdivided into physics, chemistry, astronomy, and earth science. Modern natural science is the successor to the natural philosophy that began in Ancient Greece. Galileo, Descartes, Bacon, and Newton debated the benefits of using approaches which were more mathematical and more experimental in a methodical way. Still, philosophical perspectives, conjectures, and presuppositions, often overlooked, remain necessary in natural science. [102] Systematic data collection, including discovery science, succeeded natural history, which emerged in the 16th century by describing and classifying plants, animals, minerals, and so on. [103] Today, "natural history" suggests observational descriptions aimed at popular audiences. [104]


Two curve crossing over at a point, forming a X shape
Supply and demand curve in economics, crossing over at the optimal equilibrium

Social science is the study of human behavior and functioning of societies. [12] [13] It has many disciplines that include, but are not limited to anthropology, economics, history, human geography, political science, psychology, and sociology. [12] In the social sciences, there are many competing theoretical perspectives, many of which are extended through competing research programs such as the functionalists, conflict theorists, and interactionists in sociology. [12] Due to the limitations of conducting controlled experiments involving large groups of individuals or complex situations, social scientists may adopt other research methods such as the historical method, case studies, and cross-cultural studies. Moreover, if quantitative information is available, social scientists may rely on statistical approaches to better understand social relationships and processes. [12]


Formal science is an area of study that generates knowledge using formal systems. [105] [14] [15] It includes mathematics, [106] [107] systems theory, and theoretical computer science. The formal sciences share similarities with the other two branches by relying on objective, careful, and systematic study of an area of knowledge. They are, however, different from the empirical sciences as they rely exclusively on deductive reasoning, without the need for empirical evidence, to verify their abstract concepts. [19] [108] [101] The formal sciences are therefore a priori disciplines and because of this, there is disagreement on whether they constitute a science. [16] [18] Nevertheless, the formal sciences play an important role in the empirical sciences. Calculus, for example, was initially invented to understand motion in physics. [109] Natural and social sciences that rely heavily on mathematical applications include mathematical physics, mathematical chemistry, mathematical biology, mathematical finance, and mathematical economics.[ citation needed]


see caption
A steam turbine with the case opened, such turbines produce most of the electricity used today

Applied science is the use of the scientific method and knowledge to attain practical goals and includes a broad range of disciplines such as engineering and medicine. [20] [110] [21] [111] [22] Engineering is the use of scientific principles to design and build machines, structures, technologies. [112] Engineering itself encompasses a range of more specialized fields of engineering, each with a more specific emphasis on particular areas of applied mathematics, science, and types of application. Medicine is the practice of caring for patients by maintaining and restoring health through the prevention, diagnosis, and treatment of injury or disease. [113] [114] [115] Contemporary medicine applies biomedical sciences, medical research, genetics, and medical technology to prevent, diagnose, and treat injury and disease, typically through the use of medications, medical devices, surgery, and non-pharmacological interventions. The applied sciences are often contrasted with the basic sciences, which are focused on advancing scientific theories and laws that explain and predict events in the natural world.[ citation needed]


Interdisciplinary science involves the combination of two or more disciplines into one, [116] such as bioinformatics, a combination of biology and computer science. [117]: vii 


Scientific research can be labeled as either basic or applied research. Basic research is the search for knowledge and applied research is the search for solutions to practical problems using this knowledge. Most understanding comes from basic research, though sometimes applied research targets to specific practical problems. This leads to options for technological advances that were not imaginable. [118] For example, research into the effects of red light on the human eye's rod cells lead to the discovery that human night vision is not troubled by red light, leading search and rescue teams to adopt red light in the cockpits of jets and helicopters. [119]

Scientific method

6 steps of the scientific method in a loop
A diagram variant of scientific method represented as an ongoing process

Scientific research involves using the scientific method, which seeks to objectively explain the events of nature in a reproducible way. [120] An explanatory thought experiment or hypothesis is put forward as explanation using parsimony principles and are expected to seek consilience – fitting with other accepted facts related to the phenomena. [121] This new explanation is used to make falsifiable predictions that are testable by experiment or observation. The predictions are to be posted before a confirming experiment or observation is sought, as proof that no tampering has occurred. Disproof of a prediction is evidence of progress, [120]: 4–5  [122]: 204  done either through observation or experimentation. Experimentation is especially important in science to help establish causal relationships to avoid the correlation fallacy, though in some sciences such as astronomy or geology, a predicted observation might be more appropriate. [123]

When a hypothesis proves unsatisfactory, it is either modified or discarded. [124] If the hypothesis survived testing, it may become adopted into the framework of a scientific theory, a logically reasoned, self-consistent model or framework for describing the behavior of certain natural phenomena. A theory typically describes the behavior of much broader sets of phenomena than a hypothesis; commonly, a large number of hypotheses can be logically bound together by a single theory. Thus a theory is a hypothesis explaining various other hypotheses. In that vein, theories are formulated according to most of the same scientific principles as hypotheses. Scientists may generate a model, an attempt to describe or depict the phenomenon in terms of a logical, physical or mathematical representation and to generate new hypotheses that can be tested, based on observable phenomena. [124]

While performing experiments to test hypotheses, scientists may have a preference for one outcome over another, and so it is important to ensure that science as a whole can eliminate this bias. [125] [126] This can be achieved by transparency, careful experimental design, and a thorough peer review process of the experimental results and conclusions. [127] [128] After the results of an experiment are announced or published, it is normal practice for independent researchers to double-check how the research was performed, and to follow up by performing similar experiments to determine how dependable the results might be. [129] Taken in its entirety, the scientific method allows for highly creative problem solving while minimizing effects of subjective and confirmation bias. [130] Intersubjective verifiability is fundamental to the creation of all scientific knowledge, [131]: 42–76  and the ability of reaching a consensus is an important step towards reliable knowledge. [131]: 95–123 


Four blobs of light in a cross shape and one blobs at the cross's middle
The Einstein Cross seems to be five different objects, but one object has been gravitationally lensed; the other objects of the five are multiple images of two other sources. [132]

Scientists usually take for granted a set of basic assumptions that are needed to justify the scientific method: there is an objective reality shared by all rational observers; this objective reality is governed by natural laws; these laws were discovered by means of systematic observation and experimentation. [3]

There are different schools of thought in the philosophy of science. The most popular position is empiricism, which holds that knowledge is created by a process involving observation and that scientific theories are the result of generalizations from such observations. [133]: 39–56  Empiricism generally encompasses inductivism, a position that explain how general theories can be made from the finite amount of empirical evidence available. Many versions of empiricism exist, with the predominant ones being Bayesianism [133]: 219–232  and the hypothetico-deductive method. [133]: 39–56 

Finally, another approach often cited in debates of scientific skepticism against controversial movements like " creation science" is methodological naturalism. Naturalists maintain that a difference should be made between natural and supernatural, and science should be restricted to natural explanations. [133]: 149–162  Methodological naturalism maintains that science requires strict adherence to empirical study and independent verification. [134]

Evidence and uncertainty

Sparse scatter plot with a best fit line and a shaded region
Measurements of the Hubble constant, illustrating uncertainties in science

A scientific theory is empirical [135] and is always open to falsification if new evidence is presented. That is, no theory is ever considered strictly certain as science accepts the concept of fallibilism. [136] The philosopher of science Karl Popper sharply distinguished truth from certainty. He wrote that scientific knowledge "consists in the search for truth," but it "is not the search for certainty ... All human knowledge is fallible and therefore uncertain." [137]

New scientific knowledge rarely results in vast changes in our understanding. According to psychologist Keith Stanovich, it may be the media's overuse of words like "breakthrough" that leads the public to imagine that science is constantly proving everything it thought was true to be false. While there are such famous cases as the theory of relativity that required a complete reconceptualization, these are extreme exceptions. Knowledge in science is gained by a gradual synthesis of information from different experiments by various researchers across different branches of science; it is more like a climb than a leap. Theories vary in the extent to which they have been tested and verified, as well as their acceptance in the scientific community. [119] [138] For example, heliocentric theory, the theory of evolution, relativity theory, and germ theory still bear the name "theory", even though they are widely considered to be facts.[ discuss]

Philosopher Barry Stroud adds that, although the best definition for "knowledge" is contested, being skeptical and entertaining the possibility that one is incorrect is compatible with being correct. Therefore, scientists adhering to proper scientific approaches will doubt themselves even once they possess the truth. [139] C. S. Peirce argued that inquiry is the struggle to resolve actual doubt and that merely quarrelsome, verbal, or hyperbolic doubt is fruitless [140] – they should try to attain genuine doubt rather than resting uncritically on common sense. [141] He held that the successful sciences do not trust a chain of inference but to multiple and various arguments intimately connected. [142]

Mathematics and computing

Complex swirling of field lines from a sphere
A simulation of Earth's magnetic field between two geomagnetic reversals, modeled using a supercomputer

Mathematics is essential in the formation of hypotheses, theories, and laws [143] in science. It is used extensively in quantitative modeling, observing and collecting measurements. Statistics, a branch of mathematics, is used to summarize and analyze data, which allow scientists to assess the reliability and variability of their experimental results.

Computational science applies computing power to simulate real-world situations, enabling a better understanding of scientific problems than formal mathematics alone can achieve. The use of machine learning and artificial intelligence is becoming a central feature of computational contributions to science for example in agent-based computational economics, random forests, topic modeling and various forms of prediction. However, machines alone rarely advance knowledge as they require human guidance and capacity to reason; and they can introduce bias against certain social groups or sometimes underperform against humans.[ citation needed] [144] [145]


Decorated "NATURE" as title, with scientific text below
Cover of the first issue of Nature, 4 November 1869

Scientific research is published in a range of literature. [146] Scientific journals communicate and document the results of research carried out in universities and various other research institutions, serving as an archival record of science. The first scientific journals, Journal des Sçavans followed by the Philosophical Transactions, began publication in 1665. Since that time the total number of active periodicals has steadily increased. In 1981, one estimate for the number of scientific and technical journals in publication was 11,500. [147]

Most scientific journals cover a single scientific field and publish the research within that field; the research is normally expressed in the form of a scientific paper. Science has become so pervasive in modern societies that it is considered necessary to communicate the achievements, news, and ambitions of scientists to a wider populace. [148]

Science magazines such as New Scientist, Science & Vie, and Scientific American cater to the needs of a much wider readership and provide a non-technical summary of popular areas of research, including notable discoveries and advances in certain fields of research. Science books engage the interest of many more people.[ citation needed] Tangentially, the science fiction genre, primarily fantastic in nature, engages the public imagination and transmits the ideas, if not the methods, of science. Recent efforts to intensify or develop links between science and non-scientific disciplines such as literature or more specifically, poetry, include the Creative Writing Science resource developed through the Royal Literary Fund. [149]


The replication crisis is an ongoing methodological crisis that primarily affecting parts of the social and life sciences. On subsequent investigations, result of many scientific studies are proven to be unrepeatable. [150] The crisis has long-standing roots; the phrase was coined in the early 2010s [151] as part of a growing awareness of the problem. The replication crisis represents an important body of research in metascience, which aims to improve the quality of all scientific research while reducing waste. [152]

An area of study or speculation that masquerades as science in an attempt to claim a legitimacy that it would not otherwise be able to achieve is sometimes referred to as pseudoscience, fringe science, or junk science. [153] [154]: 17  Physicist Richard Feynman coined the term " cargo cult science" for cases in which researchers believe and at the glance looks like they are doing science, but lack the honesty that allows their results to be rigorously evaluated. [155] Various types of commercial advertising, ranging from hype to fraud, may fall into these categories. Science has been described as "the most important tool" for separating valid claims from invalid ones. [156]

There can also be an element of political or ideological bias on all sides of scientific debates. Sometimes, research may be characterized as "bad science," research that may be well-intended but is incorrect, obsolete, incomplete, or over-simplified expositions of scientific ideas. The term " scientific misconduct" refers to situations such as where researchers have intentionally misrepresented their published data or have purposely given credit for a discovery to the wrong person. [157]


The scientific community is a network of interacting scientists, who conducts scientific research. The community consists of smaller groups working on scientific fields. By having peer review, through discussion and debate within journals and conferences, scientists maintain quality of research methodology and objectivity when interpreting results. [158]


Portrait of a middle-aged woman
Marie Curie was the first person to be awarded two Nobel Prizes: Physics in 1903 and Chemistry in 1911. [86]

Scientists are individuals who conduct scientific research to advance knowledge in an area of interest. [159] [160] In modern times, many professional scientists are trained in an academic setting and upon completion, attain an academic degree, with the highest degree being a doctorate such as a Doctor of Philosophy or PhD. [161] Many scientists pursue careers in various sectors of the economy such as academia, industry, government, and nonprofit organizations. [162] [163] [164]

Scientists exhibit a strong curiosity about reality and sometimes with a desire to apply scientific knowledge for the benefit of health, nations, environment, or industries. Other motivations include recognition by their peers and prestige. In modern times, many scientists have advanced degrees [165] in an area of science and pursue careers in various sectors of the economy such as academia, industry, government, and nonprofit environments. [166] [167] The Nobel Prize, a widely regarded prestigious award, is awarded annually to those who have achieved scientific advances in the fields of medicine, physics, chemistry, and economics. [168]

Science has historically been a male-dominated field, with notable exceptions. Women in science faced considerable discrimination in science, much as they did in other areas of male-dominated societies, such as frequently being passed over for job opportunities and denied credit for their work.[ citation needed] The achievements of women in science have been attributed to the defiance of their traditional role as laborers within the domestic sphere. [169] Lifestyle choice plays a major role in female engagement in science; female graduate students' interest in careers in research declines dramatically over the course of graduate school, whereas that of their male colleagues remains unchanged. [170]

Learned societies

Picture of scientists in 200th anniversary of the Prussian Academy of Sciences, 1900

Learned societies for the communication and promotion of scientific thought and experimentation have existed since the Renaissance. [171] Many scientists belong to a learned society that promotes their respective scientific discipline, profession, or group of related disciplines. [172] Membership may either be open to all, require possession of scientific credentials, or conferred by election. [173] Most scientific societies are non-profit organizations, and many are professional associations. Their activities typically include holding regular conferences for the presentation and discussion of new research results and publishing or sponsoring academic journals in their discipline. Some societies act as professional bodies, regulating the activities of their members in the public interest or the collective interest of the membership. Scholars[ who?] in the sociology of science argue that learned societies are of key importance and their formation assists in the emergence and development of new disciplines or professions.[ citation needed]

The professionalization of science, begun in the 19th century, was partly enabled by the creation of national distinguished academy of sciences such as the Italian Accademia dei Lincei in 1603, [174] the British Royal Society in 1660, the French Académie des Sciences in 1666, [175] the American National Academy of Sciences in 1863, the German Kaiser Wilhelm Institute in 1911, and the Chinese Academy of Sciences in 1928. International scientific organizations, such as the International Council for Science, are comprised of the scientific communities of different nations.[ citation needed]


Gold medal with portrait of Alfred Nobel
Medal of the Nobel Prize, one of the most well-known science awards

Science awards are usually given to individuals or organizations that has made significant contributions to a discipline. They are often given by prestigious institutions, thus it is considered a great honor for a scientist receiving them. The Nobel Prizes is one of the most well-known and prestigious science awards.[ citation needed]

Relationship with the public


Government, business, or advocacy groups have been known to use legal or economic pressure to influence scientific researches. This include making findings, dissemination, reports, or interpretation subjective. Many factors can act as facets of the politicization of science such as anti-intellectualism, perceived threats to religious beliefs, and fear for business interests. [177] Politicization of science is usually accomplished when scientific information is presented in a way that emphasizes the uncertainty associated with the scientific evidence. [178] Tactics such as shifting conversation, failing to acknowledge facts, and capitalizing on doubt of scientific consensus have been used to gain more attention for views that have been undermined by scientific evidence. [179] Examples of issues that have involved the politicization of science include the global warming controversy, health effects of pesticides, and health effects of tobacco. [179] [180]

Funding and policies

see caption
Budget of NASA as percentage of United States federal budget, peaking at 4.4% in 1966 and slowly decline since

Scientific research is often funded through a competitive process in which potential research projects are evaluated and only the most promising receive funding. Such processes, which are run by government, corporations, or foundations, allocate scarce funds. Total research funding in most developed countries is between 1.5% and 3% of GDP. [181] In the OECD, around two-thirds of research and development in scientific and technical fields is carried out by industry, and 20% and 10% respectively by universities and government. The government funding proportion in certain industries is higher, and it dominates research in social science and humanities. In the lesser-developed nations, government provides the bulk of the funds for their basic scientific research. [182]

Many governments have dedicated agencies to support scientific research. Prominent scientific organizations include the National Science Foundation in the United States, the National Scientific and Technical Research Council in Argentina, Commonwealth Scientific and Industrial Research Organisation in Australia, Centre national de la recherche scientifique in France, the Max Planck Society and Deutsche Forschungsgemeinschaft in Germany, and CSIC in Spain. In commercial research and development, all but the most research-oriented corporations focus more heavily on near-term commercialisation possibilities rather than research driven by curiosity.[ citation needed]

Science policy concerned with the policies that affect the conduct of the scientific enterprise, including research funding, often in pursuance of other national policy goals such as technological innovation to promote commercial product development, weapons development, health care, and environmental monitoring. Science policy sometimes refers to the act of applying scientific knowledge and consensus to the development of public policies. In accordance with public policy being concerned about the well-being of its citizens, science policy's goal is to consider how science and technology can best serve the public. [148] Public policy can directly affect the funding of capital equipment and intellectual infrastructure for industrial research by providing tax incentives to those organizations that fund research. [148]

Education and awareness

see caption
Students in Russia performing chemistry experiments

The education of science to the general public includes work in science content, scientific method, and some pedagogy. As a student goes to higher stages of formal education, the curriculum becomes more in depth. The traditional subjects that are usually included in the curriculum are natural and formal sciences, although there are recent movements to include social and applied science as well.[ citation needed]

The mass media face pressures that can prevent them from accurately depicting competing scientific claims in terms of their credibility within the scientific community as a whole. Determining how much weight to give different sides in a scientific debate may require considerable expertise regarding the matter. [183] Few journalists have real scientific knowledge, and even beat reporters who are knowledgeable about certain scientific issues may be ignorant about other scientific issues that they are suddenly asked to cover. [184] [185]

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