Philosophy (from Greek: φιλοσοφία, philosophia, 'love of wisdom') is the systematized study of general and fundamental questions, such as those about existence, reason, knowledge, values, mind, and language. Such questions are often posed as problems to be studied or resolved. Some sources claim the term was coined by Pythagoras (c. 570 – c. 495 BCE); others dispute this story, arguing that Pythagoreans merely claimed use of a preexisting term. Philosophical methods include questioning, critical discussion, rational argument, and systematic presentation.
In his Dream Pool Essays or Dream Torrent Essays (夢溪筆談; Mengxi Bitan) of 1088, Shen was the first to describe the magnetic needle compass, which would be used for navigation (first described in Europe by Alexander Neckam in 1187). Shen discovered the concept of true north in terms of magnetic declination towards the north pole, with experimentation of suspended magnetic needles and "the improved meridian determined by Shen's [astronomical] measurement of the distance between the pole star and true north". This was the decisive step in human history to make compasses more useful for navigation, and may have been a concept unknown in Europe for another four hundred years (evidence of German sundials made circa 1450 show markings similar to Chinese geomancers' compasses in regard to declination). (Full article...)
Bohr developed the Bohr model of the atom, in which he proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another. Although the Bohr model has been supplanted by other models, its underlying principles remain valid. He conceived the principle of complementarity: that items could be separately analysed in terms of contradictory properties, like behaving as a wave or a stream of particles. The notion of complementarity dominated Bohr's thinking in both science and philosophy. (Full article...)
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Title page from the first edition of Locke'sSome Thoughts Concerning Education (1693)
Some Thoughts Concerning Education is a 1693 treatise on the education of gentlemen written by the English philosopher John Locke. For over a century, it was the most important philosophical work on education in England. It was translated into almost all of the major written European languages during the eighteenth century, and nearly every European writer on education after Locke, including Jean-Jacques Rousseau, acknowledged its influence.
In his Essay Concerning Human Understanding (1690), Locke outlined a new theory of mind, contending that the mind is originally a tabula rasa or "blank slate"; that is, it did not contain any innate ideas at birth. Some Thoughts Concerning Education explains how to educate that mind using three distinct methods: the development of a healthy body; the formation of a virtuous character; and the choice of an appropriate academic curriculum. (Full article...)
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Cover of the first edition
The Fountainhead is a 1943 novel by Russian-American author Ayn Rand, her first major literary success. The novel's protagonist, Howard Roark, is an intransigent young architect, who battles against conventional standards and refuses to compromise with an architectural establishment unwilling to accept innovation. Roark embodies what Rand believed to be the ideal man, and his struggle reflects Rand's belief that individualism is superior to collectivism.
Roark is opposed by what he calls "second-handers", who value conformity over independence and integrity. These include Roark's former classmate, Peter Keating, who succeeds by following popular styles but turns to Roark for help with design problems. Ellsworth Toohey, a socialistarchitecture critic who uses his influence to promote his political and social agenda, tries to destroy Roark's career. Tabloid newspaper publisher Gail Wynand seeks to shape popular opinion; he befriends Roark, then betrays him when public opinion turns in a direction he cannot control. The novel's most controversial character is Roark's lover, Dominique Francon. She believes that non-conformity has no chance of winning, so she alternates between helping Roark and working to undermine him. (Full article...)
Putnam was known for his willingness to apply equal scrutiny to his own philosophical positions as to those of others, subjecting each position to rigorous analysis until he exposed its flaws. As a result, he acquired a reputation for frequently changing his positions. In philosophy of mind, Putnam is known for his argument against the type-identity of mental and physical states based on his hypothesis of the multiple realizability of the mental, and for the concept of functionalism, an influential theory regarding the mind–body problem. In philosophy of language, along with Saul Kripke and others, he developed the causal theory of reference, and formulated an original theory of meaning, introducing the notion of semantic externalism based on a thought experiment called Twin Earth. (Full article...)
Born and raised in Albany, New York, Hand majored in philosophy at Harvard College and graduated with honors from Harvard Law School. After a relatively undistinguished career as a lawyer in Albany and New York City, he was appointed at the age of 37 as a Federal District Judge in Manhattan in 1909. The profession suited his detached and open-minded temperament, and his decisions soon won him a reputation for craftsmanship and authority. Between 1909 and 1914, under the influence of Herbert Croly's social theories, Hand supported New Nationalism. He ran unsuccessfully as the Progressive Party's candidate for Chief Judge of the New York Court of Appeals in 1913, but withdrew from active politics shortly afterwards. In 1924, President Calvin Coolidge elevated Hand to the Court of Appeals for the Second Circuit, which he went on to lead as the Senior Circuit Judge (later retitled Chief Judge) from 1939 until his semi-retirement in 1951. Scholars have recognized the Second Circuit under Hand as one of the finest appeals courts in American history. Friends and admirers often lobbied for Hand's promotion to the Supreme Court, but circumstances and his political past conspired against his appointment. (Full article...)
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Atheism, in the broadest sense, is an absence of belief in the existence of deities. Less broadly, atheism is a rejection of the belief that any deities exist. In an even narrower sense, atheism is specifically the position that there are no deities. Atheism is contrasted with theism, which in its most general form is the belief that at least one deity exists.
Wollstonecraft's philosophical and gothic novel revolves around the story of a woman imprisoned in an insane asylum by her husband. It focuses on the societal rather than the individual "wrongs of woman" and criticizes what Wollstonecraft viewed as the patriarchal institution of marriage in eighteenth-century Britain and the legal system that protected it. However, the heroine's inability to relinquish her romantic fantasies also reveals women's collusion in their oppression through false and damaging sentimentalism. The novel pioneered the celebration of female sexuality and cross-class identification between women. Such themes, coupled with the publication of Godwin's scandalous Memoirs of Wollstonecraft's life, made the novel unpopular at the time it was published. (Full article...)
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Eric Alfred Havelock (/ˈhævlɒk/; 3 June 1903 – 4 April 1988) was a British classicist who spent most of his life in Canada and the United States. He was a professor at the University of Toronto and was active in the Canadian socialist movement during the 1930s. In the 1960s and 1970s, he served as chair of the classics departments at both Harvard and Yale. Although he was trained in the turn-of-the-20th-century Oxbridge tradition of classical studies, which saw Greek intellectual history as an unbroken chain of related ideas, Havelock broke radically with his own teachers and proposed an entirely new model for understanding the classical world, based on a sharp division between literature of the 6th and 5th centuries BC on the one hand, and that of the 4th on the other.
Much of Havelock's work was devoted to addressing a single thesis: that all of Western thought is informed by a profound shift in the kinds of ideas available to the human mind at the point that Greek philosophy converted from an oral to a literate form. The idea has been controversial in classical studies, and has been rejected outright both by many of Havelock's contemporaries and modern classicists. Havelock and his ideas have nonetheless had far-reaching influence, both in classical studies and other academic areas. He and Walter J. Ong (who was himself strongly influenced by Havelock) essentially founded the field that studies transitions from orality to literacy, and Havelock has been one of the most frequently cited theorists in that field; as an account of communication, his work profoundly affected the media theories of Harold Innis and Marshall McLuhan. Havelock's influence has spread beyond the study of the classical world to that of analogous transitions in other times and places. (Full article...)
Ion Heliade Rădulescu or Ion Heliade (also known as Eliade or Eliade Rădulescu; Romanian pronunciation: [ˈi.on heliˈade rəduˈlesku]; January 6, 1802 – April 27, 1872) was a Wallachian, later Romanian academic, Romantic and Classicist poet, essayist, memoirist, short story writer, newspaper editor and politician. A prolific translator of foreign literature into Romanian, he was also the author of books on linguistics and history. For much of his life, Heliade Rădulescu was a teacher at Saint Sava College in Bucharest, which he helped reopen. He was a founding member and first president of the Romanian Academy.
Heliade Rădulescu is considered one of the foremost champions of Romanian culture from the first half of the 19th century, having first risen to prominence through his association with Gheorghe Lazăr and his support of Lazăr's drive for discontinuing education in Greek. Over the following decades, he had a major role in shaping the modern Romanian language, but caused controversy when he advocated the massive introduction of Italianneologisms into the Romanian lexis. A Romantic nationalist landowner siding with moderate liberals, Heliade was among the leaders of the 1848 Wallachian revolution, after which he was forced to spend several years in exile. Adopting an original form of conservatism, which emphasized the role of the aristocratic boyars in Romanian history, he was rewarded for supporting the Ottoman Empire and clashed with the radical wing of the 1848 revolutionaries. (Full article...)
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Why Marx Was Right is a 2011 non-fiction book by the British academic Terry Eagleton about the 19th-century philosopher Karl Marx and the schools of thought, collectively known as Marxism, that arose from his work. Written for laypeople, Why Marx Was Right outlines ten objections to Marxism that they may hold and aims to refute each one in turn. These include arguments that Marxism is irrelevant owing to changing social classes in the modern world, that it is deterministic and utopian, and that Marxists oppose all reforms and believe in an authoritarian state.
In his counterarguments, Eagleton explains how class struggle is central to Marxism, and that history is seen as a progression of modes of production, like feudalism and capitalism, involving the materials, technology and social relations required to produce goods and services within the society. Under a capitalist economy, the working class, known as the proletariat, are those lacking significant autonomy over their labour conditions, and have no control over the means of production. Eagleton describes how revolutions could lead to a new mode of production—socialism—in which the working class have control, and an eventual communist society could make the state obsolete. He explores the failures of the Soviet Union and other Marxist-Leninist countries. (Full article...)
... that the book Working from Within details how W. V. Quine only began to use the term "naturalism" years after he had already developed the key tenets of the philosophy?
... that the philosopher G. E. L. Owen was described by Martha Nussbaum as "an alcoholic and an attempted womaniser"?
René Descartes, also known as Cartesius, was a noted French philosopher, mathematician, and scientist. Dubbed the "Founder of Modern Philosophy" and the "Father of Modern Mathematics," he ranks as one of the most important and influential thinkers of modern times. For good or bad, much of subsequent western philosophy is a reaction to his writings, which have been closely studied from his time down to the present day. Descartes was one of the key thinkers of the Scientific Revolution in the Western World. He is also honoured by having the Cartesian coordinate system used in plane geometry and algebra named after him.
In religion, ethics, and philosophy, goodness and evil, or simply good and evil, refers to the concept of all human desires and behaviors as conforming to a dualisticspectrum —wherein in one direction are those aspects which are wisely reverent of life and continuity ("good"), and wherein the other direction are those aspects which are vainly reverent of death and destruction ("evil").
Religious and philosophical views tend to agree that, while " good and evil" is a concept and therefore an abstraction, goodness is intrinsic to human nature and is ultimately based on the natural love, bonding, affection that people grow to feel for other people.
Likewise, most religious and philosophical interpretations agree that evil is ultimately based in an ignorance of truth (ie. human value, sanctity, divinity), and evil behavior itself is an aberration —one that defies any understanding save that the path to evil is one of confusion and excessive desire (greed)...
Dreamtime opens with the premise that many of those accused of witchcraft in early modern Christendom had been undergoing visionary journeys with the aid of a hallucinogenic salve which was suppressed by the Christian authorities. Duerr argues that this salve had been a part of the nocturnal visionary traditions associated with the goddess Diana, and he attempts to trace their origins back to the ancient world, before looking at goddesses associated with the wilderness and arguing that in various goddess-centred cultures, the cave represented a symbolic vagina and was used for birth rituals. (Full article...)
The traditional view focuses more on the early modern aspects of the Renaissance and argues that it was a break from the past, but many historians today focus more on its medieval aspects and argue that it was an extension of the Middle Ages. However, the beginnings of the period – the early Renaissance of the 15th century and the Italian Proto-Renaissance from around 1250 or 1300 – overlap considerably with the Late Middle Ages, conventionally dated to c. 1250–1500, and the Middle Ages themselves were a long period filled with gradual changes, like the modern age; and as a transitional period between both, the Renaissance has close similarities to both, especially the late and early sub-periods of either. (Full article...)
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Statue of an unknown Cynic philosopher from the Capitoline Museums in Rome. This statue is a Roman-era copy of an earlier Greek statue from the third century BC. The scroll in his right hand is an 18th-century restoration.
Cynicism (Ancient Greek: κυνισμός) is a school of thought of ancient Greek philosophy as practiced by the Cynics (Ancient Greek: Κυνικοί; Latin: Cynici). For the Cynics, the purpose of life is to live in virtue, in agreement with nature. As reasoning creatures, people can gain happiness by rigorous training and by living in a way which is natural for themselves, rejecting all conventional desires for wealth, power, and fame, and even flouting conventions openly and derisively in public. Instead, they were to lead a simple life free from all possessions.
The first philosopher to outline these themes was Antisthenes, who had been a pupil of Socrates in the late 400 BC. He was followed by Diogenes, who lived in a ceramic jar on the streets of Athens. Diogenes took Cynicism to its logical extremes, and came to be seen as the archetypal Cynic philosopher. He was followed by Crates of Thebes, who gave away a large fortune so he could live a life of Cynic poverty in Athens. (Full article...)
Torture has been carried out since ancient times. In the eighteenth and nineteenth centuries, Western countries abolished the official use of torture in the judicial system, but torture continued to be used throughout the world. A variety of methods of torture are used, often in combination; the most common form of physical torture is beatings. Since the twentieth century, many torturers have preferred non-scarring or psychological methods to provide deniability. Torturers are enabled by organizations that facilitate and encourage their behavior. Most victims of torture are poor and marginalized people suspected of crimes, although torture against political prisoners or during armed conflict has received disproportionate attention. Judicial corporal punishment and capital punishment are sometimes seen as forms of torture, but this label is internationally controversial. (Full article...)
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The history of anarchism is as ambiguous as anarchism itself. Scholars find it hard to define or agree on what anarchism means, which makes outlining its history difficult. There is a range of views on anarchism and its history. Some feel anarchism is a distinct, well-defined 19th and 20th century movement while others identify anarchist traits long before first civilisations existed.
Prehistoric society existed without formal hierarchies, which some anthropologists have described as similar to anarchism. The first traces of formal anarchist thought can be found in ancient Greece and China, where numerous philosophers questioned the necessity of the state and declared the moral right of the individual to live free from coercion. During the Middle Ages, some religious sects espoused libertarian thought, and the Age of Enlightenment, and the attendant rise of rationalism and science signalled the birth of the modern anarchist movement. (Full article...)
A conscience is a cognitive process that elicits emotion and rational associations based on an individual's moral philosophy or value system. Conscience stands in contrast to elicited emotion or thought due to associations based on immediate sensory perceptions and reflexive responses, as in sympathetic central nervous system responses. In common terms, conscience is often described as leading to feelings of remorse when a person commits an act that conflicts with their moral values. The extent to which conscience informs moral judgment before an action and whether such moral judgments are or should be based on reason has occasioned debate through much of modern history between theories of basics in ethic of human life in juxtaposition to the theories of romanticism and other reactionary movements after the end of the Middle Ages.
Religious views of conscience usually see it as linked to a morality inherent in all humans, to a beneficent universe and/or to divinity. The diverse ritualistic, mythical, doctrinal, legal, institutional and material features of religion may not necessarily cohere with experiential, emotive, spiritual or contemplative considerations about the origin and operation of conscience. Common secular or scientific views regard the capacity for conscience as probably genetically determined, with its subject probably learned or imprinted as part of a culture. (Full article...)
Christiaan Huygens,Lord of Zeelhem,FRS (/ˈhaɪɡənz/HY-gənz, US: /ˈhɔɪɡənz/HOY-gənz, Dutch: [ˈkrɪstijaːn ˈɦœyɣə(n)s](listen), also spelled Huyghens; Latin: Hugenius; 14 April 1629 – 8 July 1695) was a Dutch mathematician, physicist, engineer, astronomer, and inventor, who is regarded as one of the greatest scientists of all time and a major figure in the scientific revolution. In physics, Huygens made groundbreaking contributions in optics and mechanics, while as an astronomer he is chiefly known for his studies of the rings of Saturn and the discovery of its moon Titan. As an engineer and inventor, he improved the design of telescopes and invented the pendulum clock, a breakthrough in timekeeping and the most accurate timekeeper for almost 300 years. An exceptionally talented mathematician and physicist, Huygens was the first to idealize a physical problem by a set of parameters then analyse it mathematically, and the first to fully mathematize a mechanistic explanation of an unobservable physical phenomenon. For these reasons, he has been called the first theoretical physicist and one of the founders of modern mathematical physics.
Huygens first identified the correct laws of elastic collision in his work De Motu Corporum ex Percussione, completed in 1656 but published posthumously in 1703. In 1659, Huygens derived geometrically the standard formulae in classical mechanics for the centrifugal force in his work De vi Centrifuga, a decade before Newton. In optics, he is best known for his wave theory of light, which he proposed in 1678 and described in his Traité de la Lumière (1690). His mathematical theory of light was initially rejected in favour of Newton's corpuscular theory of light, until Augustin-Jean Fresnel adopted Huygens's principle to give a complete explanation of the rectilinear propagation and diffraction effects of light in 1821. Today this principle is known as the Huygens–Fresnel principle. (Full article...)
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Winkler County, Texas
The Winkler County nurse whistleblower case was a series of legal proceedings in West Texas related to the retaliation against two nurses who submitted an anonymous state medical board complaint against a physician in 2009. The case attracted national attention for its implications on whistleblowing by nurses. After witnessing what they believed to be unsafe medical care, nurses Anne Mitchell and Vicki Galle submitted an anonymous complaint against Dr. Rolando Arafiles to the Texas Medical Board (TMB).
When he learned of the complaint, Arafiles spoke with the sheriff of Winkler County, alleging that the nurses' reports to the medical board constituted harassment. The sheriff investigated and obtained the TMB complaint, which provided enough information about Mitchell and Galle to make them identifiable. Galle and Mitchell were terminated from the hospital and faced criminal charges of misuse of official information. Galle's charges were dropped before trial and Mitchell was acquitted by a jury. In the aftermath of Mitchell's trial, Arafiles, several county officials and a hospital administrator all faced jail time for their roles in the retaliation against the nurses. (Full article...)
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Vishnu in a boar (Varaha) avatar rescues Bhudevi (earth)
The text has five chapters, structured primarily as a discussion between Vishnu in his Varaha (boar) avatar and the sage Ribhu. The discussion covers the subjects of Tattvas, the nature and relationship between the individual soul (Self, Atman) and the Ultimate Reality (Brahman), the seven stages of learning, the characteristics of Jivanmukti (inner sense of freedom while living), and the four types of Jivanmuktas (liberated persons). The last chapter of the text is dedicated to Yoga, its goals and methods. (Full article...)
Jerry Alan Fodor (/ˈfoʊdər/; April 22, 1935 – November 29, 2017) was an American philosopher and the author of many crucial works in the fields of philosophy of mind and cognitive science. His writings in these fields laid the groundwork for the modularity of mind and the language of thought hypotheses, and he is recognized as having had "an enormous influence on virtually every portion of the philosophy of mind literature since 1960." Until his death in 2017 he held the position of State of New Jersey Professor of Philosophy, Emeritus, at Rutgers University.
Fodor was known for his provocative and sometimes polemical style of argumentation. He argued that mental states, such as beliefs and desires, are relations between individuals and mental representations. He maintained that these representations can only be correctly explained in terms of a language of thought (LOT) in the mind. Furthermore, this language of thought itself is an actually existing thing that is codified in the brain and not just a useful explanatory tool. Fodor adhered to a species of functionalism, maintaining that thinking and other mental processes consist primarily of computations operating on the syntax of the representations that make up the language of thought. (Full article...)
By applying post-structuralist theory to anarchism, Newman presents an account of post-anarchism. His post-anarchism is more substantive than that of earlier thinkers, and has influenced later approaches to the philosophy. Released in a climate of an anarchist movement hostile to postmodern philosophy, From Bakunin to Lacan was criticised for its poor understanding of and engagement with contemporary anarchism. (Full article...)
Ramasamy joined the Indian National Congress in 1919, but resigned in 1925 when he felt that the party was only serving the interests of Brahmins. He questioned the subjugation of non-Brahmin Dravidians as Brahmins enjoyed gifts and donations from non-Brahmins but opposed and discriminated against non-Brahmins in cultural and religious matters. In 1924, Ramasamy participated in non-violent agitation (satyagraha) in Vaikom, Travancore. From 1929 to 1932 Ramasamy made a tour of British Malaya, Europe, and Soviet Union which influenced him. In 1939, Ramasamy became the head of the Justice Party, and in 1944, he changed its name to Dravidar Kazhagam. The party later split with one group led by C. N. Annadurai forming the Dravida Munnetra Kazhagam (DMK) in 1949. While continuing the Self-Respect Movement, he advocated for an independent Dravida Nadu (land of the Dravidians). (Full article...)
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The Butterfly Dream, by Chinese painter Lu Zhi (c. 1550)
The Zhuangzi (Mandarin: [ʈʂwáŋ.tsɹ̩̀]; historically romanized Chuang Tzŭ) is an ancient Chinese text from the late Warring States period (476–221 BC) which contains stories and anecdotes that exemplify the carefree nature of the ideal Taoist sage. Named for its traditional author, "Master Zhuang" (Zhuangzi), the Zhuangzi is one of the two foundational texts of Taoism, along with the Tao Te Ching.
The Zhuangzi consists of a large collection of anecdotes, allegories, parables, and fables, which are often humorous or irreverent. Its main themes are of spontaneity in action and of freedom from the human world and its conventions. The fables and anecdotes in the text attempt to illustrate the falseness of human distinctions between good and bad, large and small, life and death, and human and nature. While other ancient Chinese philosophers focused on moral and personal duty, Zhuangzi promoted carefree wandering and becoming one with "the Way" (Dào道) by following nature. (Full article...)
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Rose Street as seen in an original sketch of 1851
The Rose Street Club (sometimes the International Rose Street Club and earlier the Local Rights Association for Rental and Sanitary Reform) was a far-left, anarchist organisation based in what is now Manette Street, London. Originally centred around London's German community, and acting as a meeting point for new immigrants, it became one of the leading radical clubs of Victorian London in the late-nineteenth century. Although its roots went back to the 1840s, it was properly formed in 1877 by members of a German émigré workers' education group, which soon became frequented by London radicals, and within a few years had led to the formation of similar clubs, sometimes in support and sometimes in rivalry. The Rose Street Club provided a platform for the radical speakers and agitators of the day and produced its own paper, Freiheit—which was distributed over Europe, and especially Germany—and pamphlets for other groups and individuals. Although radical, the club initially focused as much on providing a social service to its members as on activism. With the arrival of the anarchist Johann Most in London in the early 1880s, and his increasing influence within the club, it became increasingly aligned with anarchism. (Full article...)
Image 9Bust of Socrates, Roman copy after a Greek original from the 4th century BCE (from Western philosophy)
Image 10The philosopher Pyrrho of Elis, in an anecdote taken from Sextus Empiricus' Outlines of Pyrrhonism
(upper)PIRRHO • HELIENSIS • PLISTARCHI • FILIVS translation (from Latin): Pyrrho • Greek • Son of Plistarchus
(middle)OPORTERE • SAPIENTEM HANC ILLIVS IMITARI SECVRITATEMtranslation (from Latin): It is right wisdom then that all imitate this security (Pyrrho pointing at a peaceful pig munching his food)
(lower)Whoever wants to apply the real wisdom, shall not mind trepidation and misery
Image 16The Buddhist Nalanda university and monastery was a major center of learning in India from the 5th century CE to c. 1200. (from Eastern philosophy)
Image 4Oscar Wilde reclining with Poems, by Napoleon Sarony, in New York in 1882. Wilde often liked to appear idle, though in fact he worked hard; by the late 1880s he was a father, an editor, and a writer.
Image 5Friedrich Schiller (1759–1805) was a German poet, philosopher, physician, historian and playwright.
Image 14The center third of Education (1890), a stained glass window by Louis Comfort Tiffany and Tiffany Studios, located in Linsly-Chittenden Hall at Yale University. It depicts Science (personified by Devotion, Labor, Truth, Research and Intuition) and Religion (personified by Purity, Faith, Hope, Reverence and Inspiration) in harmony, presided over by the central personification of "Light·Love·Life".
Philosophy ponders the most fundamental questions humankind has been able to ask. These are increasingly numerous and over time they have been arranged into the overlapping branches of the philosophy tree:
Aesthetics: What is art? What is beauty? Is there a standard of taste? Is art meaningful? If so, what does it mean? What is good art? Is art for the purpose of an end, or is "art for art's sake?" What connects us to art? How does art affect us? Is some art unethical? Can art corrupt or elevate societies?
Epistemology: What are the nature and limits of knowledge? What is more fundamental to human existence, knowing (epistemology) or being (ontology)? How do we come to know what we know? What are the limits and scope of knowledge? How can we know that there are other minds (if we can)? How can we know that there is an external world (if we can)? How can we prove our answers? What is a true statement?
Ethics: Is there a difference between ethically right and wrong actions (or values, or institutions)? If so, what is that difference? Which actions are right, and which wrong? Do divine commands make right acts right, or is their rightness based on something else? Are there standards of rightness that are absolute, or are all such standards relative to particular cultures? How should I live? What is happiness?
Logic: What makes a good argument? How can I think critically about complicated arguments? What makes for good thinking? When can I say that something just does not make sense? Where is the origin of logic?
Metaphysics: What sorts of things exist? What is the nature of those things? Do some things exist independently of our perception? What is the nature of space and time? What is the relationship of the mind to the body? What is it to be a person? What is it to be conscious? Do gods exist?
Political philosophy: Are political institutions and their exercise of power justified? What is justice? Is there a 'proper' role and scope of government? Is democracy the best form of governance? Is governance ethically justifiable? Should a state be allowed? Should a state be able to promote the norms and values of a certain moral or religious doctrine? Are states allowed to go to war? Do states have duties against inhabitants of other states?