History of science
The history of science is the study of the development of science and scientific knowledge, including both the natural and social sciences. Science is a body of empirical and practical knowledge about the natural world, produced by scientists who emphasize the observation and prediction of real-world phenomena. Historiography of science, in contrast, studies the methods employed by historians of science; the English word scientist is recent—first coined by William Whewell in the 19th century. Investigators of nature called themselves "natural philosophers". While empirical investigations of the natural world have been described since classical antiquity, the scientific method has been employed since the Middle Ages, modern science began to develop in the early modern period, in particular in the scientific revolution of 16th- and 17th-century Europe. Traditionally, historians of science have defined science sufficiently broadly to include those earlier inquiries. From the 18th through the late 20th century, the history of science of the physical and biological sciences, was presented as a progressive accumulation of knowledge, in which true theories replaced false beliefs.
More recent historical interpretations, such as those of Thomas Kuhn, tend to portray the history of science in terms of competing paradigms or conceptual systems within a wider matrix of intellectual, cultural and political trends. These interpretations, have met with opposition for they portray the history of science as an incoherent system of incommensurable paradigms, not leading to any actual scientific progress but only to the illusion that it has occurred. In prehistoric times and technique were passed from generation to generation in an oral tradition. For example, the domestication of maize for agriculture has been dated to about 9,000 years ago in southern Mexico, before the development of writing systems. Archaeological evidence indicates the development of astronomical knowledge in preliterate societies; the development of writing enabled knowledge to be stored and communicated across generations with much greater fidelity. Many ancient civilizations systematically collected astronomical observations.
Rather than speculate on the material nature of the planets and stars, the ancients charted the relative positions of celestial bodies inferring their influence on human society. This demonstrates how ancient investigators employed a holistic intuition, assuming the interconnectedness of all things, whereas modern science rejects such conceptual leaps. Basic facts about human physiology were known in some places, alchemy was practiced in several civilizations. Considerable observation of macroscopic flora and fauna was performed; the ancient Mesopotamians had no distinction between magic. When a person became ill, doctors prescribed magical formulas to be recited as well as medicinal treatments; the earliest medical prescriptions appear in Sumerian during the Third Dynasty of Ur. The most extensive Babylonian medical text, however, is the Diagnostic Handbook written by the ummânū, or chief scholar, Esagil-kin-apli of Borsippa, during the reign of the Babylonian king Adad-apla-iddina. In East Semitic cultures, the main medicinal authority was a kind of exorcist-healer known as an āšipu.
The profession was passed down from father to son and was held in high regard. Of less frequent recourse was another kind of healer known as an asu, who corresponds more to a modern physician and treated physical symptoms using folk remedies composed of various herbs, animal products, minerals, as well as potions and ointments or poultices; these physicians, who could be either male or female dressed wounds, set limbs, performed simple surgeries. The ancient Mesopotamians practiced prophylaxis and took measures to prevent the spread of disease; the ancient Mesopotamians had extensive knowledge about the chemical properties of clay, metal ore, bitumen and other natural materials, applied this knowledge to practical use in manufacturing pottery, glass, metals, lime plaster, waterproofing. Metallurgy required scientific knowledge about the properties of metals. Nonetheless, the Mesopotamians seem to have had little interest in gathering information about the natural world for the mere sake of gathering information and were far more interested in studying the manner in which the gods had ordered the universe.
Biology of non-human organisms was only written about in the context of mainstream academic disciplines. Animal physiology was studied extensively for the purpose of divination. Animal behavior was studied for divinatory purposes. Most information about the training and domestication of animals was transmitted orally without being written down, but one text dealing with the training of horses has survived; the Mesopotamian cuneiform tablet Plimpton 322, dating to the eighteenth century BC, records a number of Pythagorean triplets... hinting that the ancient Mesopotamians might have been aware of the Pythagorean theorem over a millennium before Pythagoras. In Babylonian astronomy, records of the motions of the stars and the moon are left on thousands of clay tablets created by scribes. Today, astronomical periods identified by Mesopotamian proto-scientists are still used in We
The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, with internal convective motion that generates a magnetic field via a dynamo process, it is by far the most important source of energy for life on Earth. Its diameter is about 1.39 million kilometers, or 109 times that of Earth, its mass is about 330,000 times that of Earth. It accounts for about 99.86% of the total mass of the Solar System. Three quarters of the Sun's mass consists of hydrogen; the Sun is a G-type main-sequence star based on its spectral class. As such, it is informally and not accurately referred to as a yellow dwarf, it formed 4.6 billion years ago from the gravitational collapse of matter within a region of a large molecular cloud. Most of this matter gathered in the center, whereas the rest flattened into an orbiting disk that became the Solar System; the central mass became so hot and dense that it initiated nuclear fusion in its core. It is thought that all stars form by this process.
The Sun is middle-aged. It fuses about 600 million tons of hydrogen into helium every second, converting 4 million tons of matter into energy every second as a result; this energy, which can take between 10,000 and 170,000 years to escape from its core, is the source of the Sun's light and heat. In about 5 billion years, when hydrogen fusion in its core has diminished to the point at which the Sun is no longer in hydrostatic equilibrium, its core will undergo a marked increase in density and temperature while its outer layers expand to become a red giant, it is calculated that the Sun will become sufficiently large to engulf the current orbits of Mercury and Venus, render Earth uninhabitable. After this, it will shed its outer layers and become a dense type of cooling star known as a white dwarf, no longer produce energy by fusion, but still glow and give off heat from its previous fusion; the enormous effect of the Sun on Earth has been recognized since prehistoric times, the Sun has been regarded by some cultures as a deity.
The synodic rotation of Earth and its orbit around the Sun are the basis of solar calendars, one of, the predominant calendar in use today. The English proper name Sun may be related to south. Cognates to English sun appear in other Germanic languages, including Old Frisian sunne, Old Saxon sunna, Middle Dutch sonne, modern Dutch zon, Old High German sunna, modern German Sonne, Old Norse sunna, Gothic sunnō. All Germanic terms for the Sun stem from Proto-Germanic *sunnōn; the Latin name for the Sun, Sol, is not used in everyday English. Sol is used by planetary astronomers to refer to the duration of a solar day on another planet, such as Mars; the related word solar is the usual adjectival term used for the Sun, in terms such as solar day, solar eclipse, Solar System. A mean Earth solar day is 24 hours, whereas a mean Martian'sol' is 24 hours, 39 minutes, 35.244 seconds. The English weekday name Sunday stems from Old English and is a result of a Germanic interpretation of Latin dies solis, itself a translation of the Greek ἡμέρα ἡλίου.
The Sun is a G-type main-sequence star. The Sun has an absolute magnitude of +4.83, estimated to be brighter than about 85% of the stars in the Milky Way, most of which are red dwarfs. The Sun is heavy-element-rich, star; the formation of the Sun may have been triggered by shockwaves from more nearby supernovae. This is suggested by a high abundance of heavy elements in the Solar System, such as gold and uranium, relative to the abundances of these elements in so-called Population II, heavy-element-poor, stars; the heavy elements could most plausibly have been produced by endothermic nuclear reactions during a supernova, or by transmutation through neutron absorption within a massive second-generation star. The Sun is by far the brightest object in the Earth's sky, with an apparent magnitude of −26.74. This is about 13 billion times brighter than the next brightest star, which has an apparent magnitude of −1.46. The mean distance of the Sun's center to Earth's center is 1 astronomical unit, though the distance varies as Earth moves from perihelion in January to aphelion in July.
At this average distance, light travels from the Sun's horizon to Earth's horizon in about 8 minutes and 19 seconds, while light from the closest points of the Sun and Earth takes about two seconds less. The energy of this sunlight supports all life on Earth by photosynthesis, drives Earth's climate and weather; the Sun does not have a definite boundary, but its density decreases exponentially with increasing height above the photosphere. For the purpose of measurement, the Sun's radius is considered to be the distance from its center to the edge of the photosphere, the apparent visible surface of the Sun. By this measure, the Sun is a near-perfect sphere with an oblateness estimated at about 9 millionths, which means that its polar diameter differs from its equatorial diameter by only 10 kilometres; the tidal effect of the planets is weak and does not affect the shape of the Sun. The Sun rotates faster at its equator than at its poles; this differential rotation is caused by convective motion
Evidence, broadly construed, is anything presented in support of an assertion. This support may be weak; the strongest type of evidence is that. At the other extreme is evidence, consistent with an assertion but does not rule out other, contradictory assertions, as in circumstantial evidence. In law, rules of evidence govern the types of evidence. Types of legal evidence include testimony, documentary evidence, physical evidence; the parts of a legal case which are not in controversy are known, in general, as the "facts of the case." Beyond any facts that are undisputed, a judge or jury is tasked with being a trier of fact for the other issues of a case. Evidence and rules are used to decide questions of fact that are disputed, some of which may be determined by the legal burden of proof relevant to the case. Evidence in certain cases must be more compelling than in other situations, which drastically affects the quality and quantity of evidence necessary to decide a case. Scientific evidence consists of observations and experimental results that serve to support, refute, or modify a scientific hypothesis or theory, when collected and interpreted in accordance with the scientific method.
In philosophy, the study of evidence is tied to epistemology, which considers the nature of knowledge and how it can be acquired. The burden of proof is the obligation of a party in an argument or dispute to provide sufficient evidence to shift the other party's or a third party's belief from their initial position; the burden of proof must be fulfilled by both establishing confirming evidence and negating oppositional evidence. Conclusions drawn from evidence may be subject to criticism based on a perceived failure to fulfill the burden of proof. Two principal considerations are: On whom does the burden of proof rest? To what degree of certitude must the assertion be supported? The latter question depends on the nature of the point under contention and determines the quantity and quality of evidence required to meet the burden of proof. In a criminal trial in the United States, for example, the prosecution carries the burden of proof since the defendant is presumed innocent until proven guilty beyond a reasonable doubt.
In most civil procedures, the plaintiff carries the burden of proof and must convince a judge or jury that the preponderance of the evidence is on their side. Other legal standards of proof include "reasonable suspicion", "probable cause", "prima facie evidence", "credible evidence", "substantial evidence", "clear and convincing evidence". In a philosophical debate, there is an implicit burden of proof on the party asserting a claim, since the default position is one of neutrality or unbelief; each party in a debate will therefore carry the burden of proof for any assertion they make in the argument, although some assertions may be granted by the other party without further evidence. If the debate is set up as a resolution to be supported by one side and refuted by another, the overall burden of proof is on the side supporting the resolution. In scientific research evidence is accumulated through observations of phenomena that occur in the natural world, or which are created as experiments in a laboratory or other controlled conditions.
Scientific evidence goes towards supporting or rejecting a hypothesis. The burden of proof is on the person making a contentious claim. Within science, this translates to the burden resting on presenters of a paper, in which the presenters argue for their specific findings; this paper is placed before a panel of judges where the presenter must defend the thesis against all challenges. When evidence is contradictory to predicted expectations, the evidence and the ways of making it are closely scrutinized and only at the end of this process is the hypothesis rejected: this can be referred to as'refutation of the hypothesis'; the rules for evidence used by science are collected systematically in an attempt to avoid the bias inherent to anecdotal evidence. Evidence forms the foundation of a legal system, without which law would be subject to the whims of those with power. In law, the production and presentation of evidence depends first on establishing on whom the burden of proof lies. Admissible evidence is that which a court receives and considers for the purposes of deciding a particular case.
Two primary burden-of-proof considerations exist in law. The first is on. In many Western, the burden of proof is placed on the prosecution in criminal cases and the plaintiff in civil cases; the second consideration is the degree of certitude proof must reach, depending on both the quantity and quality of evidence. These degrees are different for criminal and civil cases, the former requiring evidence beyond a reasonable doubt, the latter considering only which side has the preponderance of evidence, or whether the proposition is more true or false; the decision maker a jury, but sometimes a judge, decides whether the burden of proof has been fulfilled. After deciding who will carry the burden of proof, evidence is first gathered and presented before the court: In criminal investigation, rather than attempting to prove an abstract or hypothetical point, the evidence gatherers attempt to determine, responsible for a criminal act; the focus of criminal evidence is to connect physical evidence and reports of witnesses to a specific person.
The path that physical evidence takes from the scene of a crime or the arrest of a suspect to the courtroom is called the chain of custody. In a criminal case, this path must be cle
Theology is the critical study of the nature of the divine. It is taught as an academic discipline in universities and seminaries. Theology is the study of deities or their scriptures in order to discover what they have revealed about themselves, it occupies itself with the unique content of analyzing the supernatural, but especially with epistemology, asks and seeks to answer the question of revelation. Revelation pertains to the acceptance of God, gods, or deities, as not only transcendent or above the natural world, but willing and able to interact with the natural world and, in particular, to reveal themselves to humankind. While theology has turned into a secular field, religious adherents still consider theology to be a discipline that helps them live and understand concepts such as life and love and that helps them lead lives of obedience to the deities they follow or worship. Theology is derived from the Greek theologia, which derived from Τheos, meaning "God", -logia, meaning "utterances, sayings, or oracles" which had passed into Latin as theologia and into French as théologie.
The English equivalent "theology" had evolved by 1362. The sense the word has in English depends in large part on the sense the Latin and Greek equivalents had acquired in patristic and medieval Christian usage, although the English term has now spread beyond Christian contexts. Augustine of Hippo defined the Latin equivalent, theologia, as "reasoning or discussion concerning the Deity"; the term can, however, be used for a variety of fields of study. Theology begins with the assumption that the divine exists in some form, such as in physical, mental, or social realities, that evidence for and about it may be found via personal spiritual experiences or historical records of such experiences as documented by others; the study of these assumptions is not part of theology proper but is found in the philosophy of religion, through the psychology of religion and neurotheology. Theology aims to structure and understand these experiences and concepts, to use them to derive normative prescriptions for how to live our lives.
Theologians use various forms of analysis and argument to help understand, test, defend or promote any myriad of religious topics. As in philosophy of ethics and case law, arguments assume the existence of resolved questions, develop by making analogies from them to draw new inferences in new situations; the study of theology may help a theologian more understand their own religious tradition, another religious tradition, or it may enable them to explore the nature of divinity without reference to any specific tradition. Theology may be used to propagate, reform, or justify a religious tradition or it may be used to compare, challenge, or oppose a religious tradition or world-view. Theology might help a theologian address some present situation or need through a religious tradition, or to explore possible ways of interpreting the world. Greek theologia was used with the meaning "discourse on god" in the fourth century BC by Plato in The Republic, Book ii, Ch. 18. Aristotle divided theoretical philosophy into mathematike and theologike, with the last corresponding to metaphysics, for Aristotle, included discourse on the nature of the divine.
Drawing on Greek Stoic sources, the Latin writer Varro distinguished three forms of such discourse: mythical and civil. Theologos related to theologia, appears once in some biblical manuscripts, in the heading to the Book of Revelation: apokalypsis ioannoy toy theologoy, "the revelation of John the theologos". There, the word refers not to John the "theologian" in the modern English sense of the word but—using a different sense of the root logos, meaning not "rational discourse" but "word" or "message"—one who speaks the words of God, logoi toy theoy; some Latin Christian authors, such as Tertullian and Augustine, followed Varro's threefold usage, though Augustine used the term more to mean'reasoning or discussion concerning the deity'In patristic Greek Christian sources, theologia could refer narrowly to devout and inspired knowledge of, teaching about, the essential nature of God. The Latin author Boethius, writing in the early 6th century, used theologia to denote a subdivision of philosophy as a subject of academic study, dealing with the motionless, incorporeal reality.
Boethius' definition influenced medieval Latin usage. In scholastic Latin sources, the term came to denote the rational study of the doctrines of the Christian religion, or the academic discipline which investigated the coherence and implications of the language and claims of the Bible and of the theological tradition. In the Renaissance with Florentine Platonist apologists of Dante's poetics, the distinction between "poetic theology" and "revealed" or Biblical theology serves as steppingstone for a revival of philosophy as independent of theological authority, it is in this last sense, theology as an academic discipline involving rational study of Christian teaching
Geology is an earth science concerned with the solid Earth, the rocks of which it is composed, the processes by which they change over time. Geology can include the study of the solid features of any terrestrial planet or natural satellite such as Mars or the Moon. Modern geology overlaps all other earth sciences, including hydrology and the atmospheric sciences, so is treated as one major aspect of integrated earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, the processes that have shaped that structure, it provides tools to determine the relative and absolute ages of rocks found in a given location, to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, the Earth's past climates. Geologists use a wide variety of methods to understand the Earth's structure and evolution, including field work, rock description, geophysical techniques, chemical analysis, physical experiments, numerical modelling.
In practical terms, geology is important for mineral and hydrocarbon exploration and exploitation, evaluating water resources, understanding of natural hazards, the remediation of environmental problems, providing insights into past climate change. Geology is a major academic discipline, it plays an important role in geotechnical engineering; the majority of geological data comes from research on solid Earth materials. These fall into one of two categories: rock and unlithified material; the majority of research in geology is associated with the study of rock, as rock provides the primary record of the majority of the geologic history of the Earth. There are three major types of rock: igneous and metamorphic; the rock cycle illustrates the relationships among them. When a rock solidifies or crystallizes from melt, it is an igneous rock; this rock can be weathered and eroded redeposited and lithified into a sedimentary rock. It can be turned into a metamorphic rock by heat and pressure that change its mineral content, resulting in a characteristic fabric.
All three types may melt again, when this happens, new magma is formed, from which an igneous rock may once more solidify. To study all three types of rock, geologists evaluate the minerals; each mineral has distinct physical properties, there are many tests to determine each of them. The specimens can be tested for: Luster: Measurement of the amount of light reflected from the surface. Luster is broken into nonmetallic. Color: Minerals are grouped by their color. Diagnostic but impurities can change a mineral’s color. Streak: Performed by scratching the sample on a porcelain plate; the color of the streak can help name the mineral. Hardness: The resistance of a mineral to scratch. Breakage pattern: A mineral can either show fracture or cleavage, the former being breakage of uneven surfaces and the latter a breakage along spaced parallel planes. Specific gravity: the weight of a specific volume of a mineral. Effervescence: Involves dripping hydrochloric acid on the mineral to test for fizzing. Magnetism: Involves using a magnet to test for magnetism.
Taste: Minerals can have a distinctive taste, like halite. Smell: Minerals can have a distinctive odor. For example, sulfur smells like rotten eggs. Geologists study unlithified materials, which come from more recent deposits; these materials are superficial deposits. This study is known as Quaternary geology, after the Quaternary period of geologic history. However, unlithified material does not only include sediments. Magmas and lavas are the original unlithified source of all igneous rocks; the active flow of molten rock is studied in volcanology, igneous petrology aims to determine the history of igneous rocks from their final crystallization to their original molten source. In the 1960s, it was discovered that the Earth's lithosphere, which includes the crust and rigid uppermost portion of the upper mantle, is separated into tectonic plates that move across the plastically deforming, upper mantle, called the asthenosphere; this theory is supported by several types of observations, including seafloor spreading and the global distribution of mountain terrain and seismicity.
There is an intimate coupling between the movement of the plates on the surface and the convection of the mantle. Thus, oceanic plates and the adjoining mantle convection currents always move in the same direction – because the oceanic lithosphere is the rigid upper thermal boundary layer of the convecting mantle; this coupling between rigid plates moving on the surface of the Earth and the convecting mantle is called plate tectonics. The development of plate tectonics has provided a physical basis for many observations of the solid Earth. Long linear regions of geologic features are explained as plate boundaries. For example: Mid-ocean ridges, high regions on the seafloor where hydrothermal vents and volcanoes exist, are seen as divergent boundaries, where two plates move apart. Arcs of volcanoes and earthquakes are theorized as convergent boundaries, where one plate subducts, or moves, under another. Transform boundaries, such as the San Andreas Fault system, resulted in widespread powerful earthquakes.
Plate tectonics has provided a mechan
Ethics or moral philosophy is a branch of philosophy that involves systematizing and recommending concepts of right and wrong conduct. The field of ethics, along with aesthetics, concerns matters of value, thus comprises the branch of philosophy called axiology. Ethics seeks to resolve questions of human morality by defining concepts such as good and evil and wrong, virtue and vice and crime; as a field of intellectual inquiry, moral philosophy is related to the fields of moral psychology, descriptive ethics, value theory. Three major areas of study within ethics recognized today are: Meta-ethics, concerning the theoretical meaning and reference of moral propositions, how their truth values can be determined Normative ethics, concerning the practical means of determining a moral course of action Applied ethics, concerning what a person is obligated to do in a specific situation or a particular domain of action The English word "ethics" is derived from the Ancient Greek word ēthikós, meaning "relating to one's character", which itself comes from the root word êthos meaning "character, moral nature".
This was borrowed into Latin as ethica and into French as éthique, from which it was borrowed into English. Rushworth Kidder states that "standard definitions of ethics have included such phrases as'the science of the ideal human character' or'the science of moral duty'". Richard William Paul and Linda Elder define ethics as "a set of concepts and principles that guide us in determining what behavior helps or harms sentient creatures"; the Cambridge Dictionary of Philosophy states that the word "ethics" is "commonly used interchangeably with'morality'... and sometimes it is used more narrowly to mean the moral principles of a particular tradition, group or individual." Paul and Elder state that most people confuse ethics with behaving in accordance with social conventions, religious beliefs and the law and don't treat ethics as a stand-alone concept. The word ethics in English refers to several things, it can refer to philosophical ethics or moral philosophy—a project that attempts to use reason to answer various kinds of ethical questions.
As the English philosopher Bernard Williams writes, attempting to explain moral philosophy: "What makes an inquiry a philosophical one is reflective generality and a style of argument that claims to be rationally persuasive." Williams describes the content of this area of inquiry as addressing the broad question, "how one should live". Ethics can refer to a common human ability to think about ethical problems, not particular to philosophy; as bioethicist Larry Churchill has written: "Ethics, understood as the capacity to think critically about moral values and direct our actions in terms of such values, is a generic human capacity." Ethics can be used to describe a particular person's own idiosyncratic principles or habits. For example: "Joe has strange ethics." Meta-ethics is the branch of philosophical ethics that asks how we understand, know about, what we mean when we talk about what is right and what is wrong. An ethical question pertaining to a particular practical situation—such as, "Should I eat this particular piece of chocolate cake?"—cannot be a meta-ethical question.
A meta-ethical question is abstract and relates to a wide range of more specific practical questions. For example, "Is it possible to have secure knowledge of what is right and wrong?" is a meta-ethical question. Meta-ethics has always accompanied philosophical ethics. For example, Aristotle implies that less precise knowledge is possible in ethics than in other spheres of inquiry, he regards ethical knowledge as depending upon habit and acculturation in a way that makes it distinctive from other kinds of knowledge. Meta-ethics is important in G. E. Moore's Principia Ethica from 1903. In it he first wrote about. Moore was seen to reject naturalism in his Open Question Argument; this made. Earlier, the Scottish philosopher David Hume had put forward a similar view on the difference between facts and values. Studies of how we know in ethics divide into non-cognitivism. Non-cognitivism is the view that when we judge something as morally right or wrong, this is neither true nor false. We may, for example, be only expressing our emotional feelings about these things.
Cognitivism can be seen as the claim that when we talk about right and wrong, we are talking about matters of fact. The ontology of ethics is about value-bearing things or properties, i.e. the kind of things or stuff referred to by ethical propositions. Non-descriptivists and non-cognitivists believe that ethics does not need a specific ontology since ethical propositions do not refer; this is known as an anti-realist position. Realists, on the other hand, must explain what kind of entities, properties or states are relevant for ethics, how they have value, why they guide and motivate our actions. Normative ethics is the study of ethical action, it is the branch of ethics that investigates the set of questions that arise when considering how one ought to act, morally speaking. Normative ethics is distinct from meta-ethics because normative ethics examines standards for the rightness and wrongness of actions, while meta-ethics studies the meaning of moral language and the metaphysics of moral facts.
Normative ethics is distinct from descriptive ethics, as the latter is an empirical investigation of people's moral beliefs. To put it another way, descriptive ethics would be concerned with determining what proportion of people believe th