SYMBOLIC LOGIC. CHAPTER I. ON THE FORMS OF LOGICAL PROPOSITION. IT has been mentioned in the Introduction that the System of Logic which this work is ...

Techniques for achieving moral enhancement will modify brain processes to produce what is alleged to be more moral conduct. Neurophilosophy and neuroethics must ponder what “moral enhancement” could possibly be, if possible at all. Objections to the very possibility of moral enhancement, raised from various philosophical and neuroscientific standpoints, fail to justify skepticism, but they do place serious constraints on the kinds of efficacious moral enhancers. While there won't be a “morality pill,” and hopes for global moral enlightenment will remain (...) hopes, there will be a large variety of behavioral modifiers described as enhancers of some aspect of morality or another according to prevailing social norms. The most likely moral enhancers that will be designed, tested, and marketed in the near future will attempt to alleviate seriously immoral and illegal behavior. Some enhancers diminishing antisocial conduct and a few designed to elevate moral conduct above normal levels will also become available, although their widespread use is doubtful. There will also be specialized modifications for enhancing whatever an individual personally regards as moral, and for enabling better performance by a person in an operational role. A measure of skepticism toward all the proposed kinds of moral enhancement is advised, and where political implementation of moral enhancers is concerned, a healthy amount of cynicism as well. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Toward Resilient DemocracyCognitive Resources and ConstraintsJohn Teehan (bio)I. Introduction: The Cognitive Science of ReligionAmerican Immanence, an important and insightful work, offers an analysis of the existential crisis facing American democracy, and a possible path through this crisis. In developing this path, Michael Hogue asks, "can the feeling and awareness of the precarious value of life …awaken us to the precious depths of immanence, to living as if this, our (...) one and only world, matters ultimately?"1 Such an awakening, he argues, is vital to developing a "resilient democracy." I believe the answer to his question is "yes," and a positive answer to this profound question is sufficient warrant for exploring the path Hogue sets out. However, there is another question, one with broader implications: can this moral vision be adopted on a wide enough scale to attain the critical mass necessary to develop a democracy sufficiently resilient to weather this crisis? I will explore this second question using the insights derived from cognitive science, and particularly from the cognitive science of religion. This approach picks up on Hogue's invitation to interpret religion "within the evolutionary contexts of natural history,"2 and concurs with his claim that in "demystifying religion" an "evolutionary account …opens the way to a religious experience."3The Cognitive Science of Religion (CSR) is grounded in an evolutionary understanding of human cognitive and emotional processes, as these processes have developed to enable the species to respond to the challenges of survival and reproduction in dynamic environments, both physical and social. These cognitive tools were not shaped to discern some pre-given reality, but rather to serve the practical goals of natural beings embedded in natural situations. CSR, then, is congruent with the immanental philosophy, grounded in pragmatism, that Hogue develops in his book. Indeed, it can be argued that the methodology of CSR implicitly entails a pragmatist epistemology4. The various [End Page 65] mental tools and resultant religious beliefs and rituals all serve the ultimate goal of successful action within natural situations. CSR, then, can provide an empirical account of at least some of the processes that would be involved in actualizing an immanental political theology, and may identify some of the cognitive obstacles to that project.It is beyond the scope of this essay to set out a detailed account of CSR, but it will suffice to introduce some general tenets that have played a seminal role in the field.5 Those elements of a cultural system that we would deem religious are derived from natural cognitive processes that evolved to allow our earliest ancestors to successfully navigate an uncertain and dangerous environment.6 As an example, let's consider the gods, understanding by the "gods" any of the various beings that might commonly be termed "supernatural" (e.g., gods, spirits, ghosts, demons, fairies, divine ancestors, etc.). Belief in gods is theorized to flow, in part, from natural cognitive mechanisms for the detection of agents (that is, beings that act with intent). The ability to detect such beings—beings that might pose a danger—is essential to surviving in an uncertain and dangerous world. This ability was so vital that natural selection favored the evolution of a cognitive process for detecting agents that is hypersensitive.7 Detecting the presence of an agent when none is actually present is a much safer error than failing to detect an actual predator, and so this cognitive strategy could regularly give rise to false positives.Detecting the presence of an agent is the beginning phase of devising effective action, but to determine how to respond to this perceived agent, we must make sense of its possible intent. Therefore, we do not merely perceive a presence, we ascribe intention and purpose to that agent. In doing so, we engage the mental process termed Theory of Mind (ToM).8 Detecting the [End Page 66] action of agents, and determining intention and purpose, are vital to successful action. In a dangerous and uncertain world—i.e. the world in which humans have lived for millennia—these skills are essential to survival, and it follows that natural selection would favor cognitive processes that erred on the side of... (shrink)

“Gettier cases” have played a major role in Anglo-American analytic epistemology over the past fifty years. Philosophers have grouped a bewildering array of examples under the heading “Gettier case.” Philosophers claim that these cases are obvious counterexamples to the “traditional” analysis of knowledge as justified true belief, and they treat correctly classifying the cases as a criterion for judging proposed theories of knowledge. Cognitive scientists recently began testing whether philosophers are right about these cases. It turns out that philosophers were (...) partly right and partly wrong. Some “Gettier cases” are obvious examples of ignorance, but others are obvious examples of knowledge. It also turns out that much research in this area of philosophy is marred by experimenter bias, invented historical claims, dysfunctional categorization of examples, and mischaracterization by philosophers of their own intuitive judgments about particular cases. Despite these shortcomings, lessons learned from studying “Gettier cases” are leading to important insights about knowledge and knowledge attributions, which are central components of social cognition. (shrink)

The notion of proof is central to mathematics yet it is one of the most difficult aspects of the subject to teach and master. In particular, undergraduate mathematics students often experience difficulties in understanding and constructing proofs. Understanding Mathematical Proof describes the nature of mathematical proof, explores the various techniques that mathematicians adopt to prove their results, and offers advice and strategies for constructing proofs. It will improve students’ ability to understand proofs and construct correct proofs of their own. The (...) first chapter of the text introduces the kind of reasoning that mathematicians use when writing their proofs and gives some example proofs to set the scene. The book then describes basic logic to enable an understanding of the structure of both individual mathematical statements and whole mathematical proofs. It also explains the notions of sets and functions and dissects several proofs with a view to exposing some of the underlying features common to most mathematical proofs. The remainder of the book delves further into different types of proof, including direct proof, proof using contrapositive, proof by contradiction, and mathematical induction. The authors also discuss existence and uniqueness proofs and the role of counter examples. (shrink)

Despite recurring efforts, a gap exists across a variety of contexts between the protection of patients' safety in theory and in practice. This timely Research Handbook highlights these critical issues and suggests both legal and policy changes are necessary to better protect patients' safety. Multidisciplinary in nature, this Research Handbook features contributions from eminent academics, policy makers and medical practitioners from the Global North and South, discussing the essential facets concerning patient safety and the law. It highlights how the role (...) of legislation and case law has the potential to influence, both positively and negatively, medical practice and the quality of care. Chapters explore patient safety and the global health agenda; physiotherapy; 'non-therapeutic' clinical research with children; patient safety awareness in healthcare education; and the increasing use of robotics and artificial intelligence in healthcare. Outlining a wide range of international perspectives on patient safety and the law, this Research Handbook will appeal to academics and researchers specialising in health and medical law, human rights and healthcare regulation. It will also serve as a valuable resource for legal and medical practitioners alike, as well as clinicians and professionals working in healthcare governance. (shrink)

A commitment to receive input from stakeholders is often obligatory in the crafting of environmental policies. This requirement is presumed to satisfy certain conditions of democracy. In this article, by drawing from pragmatism, we examine the logic of participation and prerequisites of the meaningful game of asking for and giving reasons. We elaborate the nature and significance of three components—the game, the pleadings, and the reasons. We conclude by offering the conditions under which the stakeholder game might be considered legitimate.

Reporting peers’ counterproductive work behaviors (CWBs) is important for maintaining an ethical organization, but is a significant and potentially risky action. In Bandura’s Theory of Moral Thought and Action (Bandura, 1991) he states that such acts require significant moral agency, which is generated when an individual possesses adequate moral self-regulatory capacities to address the issue and is in a context that activates and reinforces those capacities. Guided by this theory, we assess moral potency (i.e., moral courage, moral efficacy, and moral (...) ownership) as key capacities predicting peer reporting intentions and assess three contextual factors influencing the generation and effects of moral potency: whether a potential informant (1) works for an ethical leader, (2) is embedded in a psychologically safe climate promoting interpersonal risk-taking, and (3) operates in a more normal or extreme context. We assess the proposed model across three field studies entailing both normal and extreme (i.e., firefighting units) contexts. Results show that ethical leaders raise employees’ moral potency, promoting greater willingness to report their peers’ CWBs. In normal work contexts, psychological safety positively moderated both the relationship between ethical leadership and moral potency and between moral potency and peer reporting intentions. However, psychological safety had the opposite effects in more extreme work contexts. Whereas psychological safety strengthens the positive association between moral potency and peer reporting intentions in normal work contexts, in contexts where individuals are more frequently exposed to extreme events, psychological safety weakens this relationship, thus highlighting the unforeseen downsides of psychological safety in extreme contexts. (shrink)

This book shows that, far from repudiating Hegel, Dewey's entire pragmatic philosophy is premised on a "philosophy of spirit" inspired by Hegel's project.

Science (episteme) -- Division of the sciences according to aims and objects -- Demonstration (apodeixis) -- The axioms of the sciences -- Being or substance (ousia) -- Being before aristotle -- Being in the categories -- The science of being: first philosophy -- Being in metaphysics zeta -- Nature (physis) -- Principles of change -- The four causes or explanations (aitiai) -- Defense of teleology -- Soul (psyche) -- Soul as substance, form and actuality -- What the student of soul (...) investigates -- Perception -- Thought -- Success (eudaimonia) -- The practical science of ethics -- The chief and final good for human beings -- Virtues of character -- Virtues of intellect. (shrink)

In the United States, interest in urban agriculture has grown dramatically. While community gardens have sprouted across the landscape, home food gardens—arguably an ever-present, more durable form of urban agriculture—have been overlooked, understudied, and unsupported by government agencies, non-governmental organizations, and academics. In part a response to the invisibility of home gardens, this paper is a manifesto for their study in the Global North. It seeks to develop a multi-scalar and multidisciplinary research framework that acknowledges the garden’s social and ecological (...) or material dimensions. Given the lack of existing research, we draw on the more extensive literature on home gardens in the South and community gardens in the North to develop a set of hypotheses about the social-ecological effects of urban home food gardens in the North. These gardens, we hypothesize, contribute to food security, community development, cultural reproduction, and resilience at multiple scales; conserve agrobiodiversity; and support urban biodiversity. They may also have negative ecological effects, such as stormwater nutrient loading. Because of the entanglement of the social and the ecological or material in the garden, we review three theoretical perspectives—social ecological systems theory, actor-network theory, and assemblage theory—that have been or could be applied to the multi-scalar and multidisciplinary study of the garden. We also review sampling and analytic methods for conducting home garden research. The paper concludes with a discussion of opportunities to extend the research agenda beyond descriptive analysis, the primary focus of garden research to date. (shrink)

Traces of many past events are often layered or superposed, in brain, body, and world alike. This often poses challenges for individuals and groups, both in accessing specific past events and in regulating or managing coexisting emotions or attitudes. We sometimes struggle, for example, to find appropriate modes of engagement with places with complex and difficult pasts. More generally, there can appear to be a tension between what we know about the highly constructive nature of remembering, whether it is drawing (...) on neural or worldly resources or both, and the ways that we need and use memory to make claims on the past, and to maintain some appropriate causal connections to past events. I assess the current state of work on situated affect and distributed memory, and the recent criticisms of the ‘dogma of harmony’ in these fields. I then deploy these frameworks to examine some affective dimensions of place memory, sketching a strongly distributed conception of places as sometimes partly constituting the processes and activities of feeling and remembering. These approaches also offer useful perspectives on the problems of how to engage – politically and aesthetically – with difficult pasts and historically burdened heritage. In assessing artistic interventions in troubled places, we can seek responsibly to do justice to the past while fully embracing the dynamic and contested constructedness of our present emotions, memories, and activities. (shrink)

First Published in 1999. Routledge is an imprint of Taylor & Francis, an informa company.

Many philosophers favour the simple knowledge account of assertion, which says you may assert something only if you know it. The simple account is true but importantly incomplete. I defend a more informative thesis, namely, that you may assert something only if your assertion expresses knowledge. I call this 'the express knowledge account of assertion', which I argue better handles a wider range of cases while at the same time explaining the simple knowledge account's appeal. §1 introduces some new data (...) that a knowledge account of assertion well explains. §2 explains the simple knowledge account's advantage over two of its main competitors. §3 presents a problem for the simple account and offers a solution, which is to adopt the express knowledge account. §4 encapsulates the case for the express knowledge account, and offers a unifying vision for the epistemology of belief and assertion. §5 answers an objection. §6 briefly sums up. Even those who ultimately reject my conclusion can still benefit from the new data presented in §1, and learn an important lesson from the problem discussed in §3, which demonstrates a general constraint on an acceptable account of the norm of assertion. (shrink)

Epistemic reasons are mental states. They are not propositions or non-mental facts. The discussion proceeds as follows. Section 1 introduces the topic. Section 2 gives two concrete examples of how our topic directly affects the internalism/externalism debate in normative epistemology. Section 3 responds to an argument against the view that reasons are mental states. Section 4 presents two problems for the view that reasons are propositions. Section 5 presents two problems for the view that reasons are non-mental facts. Section 6 (...) argues that reasons are mental states. Section 7 responds to objections. (shrink)

Aristotle attaches particular significance to the homonymy of many central concepts in philosophy and science: that is, to the diversity of ways of being common to a single general concept. His preoccupation with homonymy influences his approach to almost every subject that he considers, and it clearly structures the philosophical methodology that he employs both when criticizing others and when advancing his own positive theories. Where there is homonymy there is multiplicity: Aristotle aims to find the order within this multiplicity, (...) and believes that doing so is crucial to scientific inquiry and philosophical progress.Christopher Shields investigates and evaluates Aristotle's approach to questions about homonymy, characterizing the metaphysical and semantic commitments necessary to establish the homonymy of a given concept. Then, in a series of case-studies, Shields examines in detail some of Aristotle's principal applications of homonymy--to the body, sameness and oneness, life, goodness, and being. Shields's aim is not only to give a fuller understanding of Aristotle's methodology and to illuminate his specific doctrines in a variety of areas, but to show that this methodology remains fruitful today. (shrink)

This paper explains what it is to believe something for a reason. My thesis is that you believe something for a reason just in case the reason non-deviantly causes your belief. In the course of arguing for my thesis, I present a new argument that reasons are causes, and offer an informative account of causal non-deviance.

In this essay I show how to reconcile epistemic invariantism with the knowledge account of assertion. My basic proposal is that we can comfortably combine invariantism with the knowledge account of assertion by endorsing contextualism about speech acts. My demonstration takes place against the backdrop of recent contextualist attempts to usurp the knowledge account of assertion, most notably Keith DeRose's influential argument that the knowledge account of assertion spells doom for invariantism and enables contextualism's ascendancy.

I argue against the orthodox view of the relationship between propositional and doxastic justification. The view under criticism is: if p is propositionally justified for S in virtue of S's having reason R, and S believes p on the basis of R, then S's belief that p is doxastically justified. I then propose and evaluate alternative accounts of the relationship between propositional and doxastic justification, and conclude that we should explain propositional justification in terms of doxastic justification. If correct, this (...) proposal would constitute a significant advance in our understanding of the sources of epistemic justification. (shrink)

Assertion is fundamental to our lives as social and cognitive beings. Philosophers have recently built an impressive case that the norm of assertion is factive. That is, you should make an assertion only if it is true. Thus far the case for a factive norm of assertion been based on observational data. This paper adds experimental evidence in favor of a factive norm from six studies. In these studies, an assertion’s truth value dramatically affects whether people think it should be (...) made. Whereas nearly everyone agreed that a true assertion supported by good evidence should be made, most people judged that a false assertion supported by good evidence should not be made. The studies also suggest that people are consciously aware of criteria that guide their evaluation of assertions. Evidence is also presented that some intuitive support for a non-factive norm of assertion comes from a surprising tendency people have to misdescribe cases of blameless rule-breaking as cases where no rule is broken. (shrink)

Qualitative Complexity offers a critique of the humanist paradigm in contemporary social theory. Drawing from sources in sociology, philosophy, complexity theory, 'fuzzy logic', systems theory, cognitive science and evolutionary biology, the authors present a new series of interdisciplinary perspectives on the sociology of complex, self-organizing structures.

Can judging that an agent blamelessly broke a rule lead us to claim, paradoxically, that no rule was broken at all? Surprisingly, it can. Across seven experiments, we document and explain the phenomenon of excuse validation. We found when an agent blamelessly breaks a rule, it significantly distorts people’s description of the agent’s conduct. Roughly half of people deny that a rule was broken. The results suggest that people engage in excuse validation in order to avoid indirectly blaming others for (...) blameless transgressions. Excuse validation has implications for recent debates in normative ethics, epistemology and the philosophy of language. These debates have featured thought experiments perfectly designed to trigger excuse validation, inhibiting progress in these areas. (shrink)

A standard view in contemporary philosophy is that belief is involuntary, either as a matter of conceptual necessity or as a contingent fact of human psychology. We present seven experiments on patterns in ordinary folk-psychological judgments about belief. The results provide strong evidence that voluntary belief is conceptually possible and, granted minimal charitable assumptions about folk-psychological competence, provide some evidence that voluntary belief is psychologically possible. We also consider two hypotheses in an attempt to understand why many philosophers have been (...) tempted to view belief as involuntary: that belief is a prototype concept and that belief is a dual character concept. Altogether, our findings contribute to longstanding philosophical debates about the relationship between the will and the intellect, while also advancing scientific understanding of important social judgments. (shrink)

As one of the first readers of this fine collection of chapters in improvisation studies, I’ve been interactively constructing my experiences and interpretations of the chapters as I go along. Engaged reading – like all our characteristic activities – has a substantial improvisatory dimension. Readers are neither passively downloading data transmitted fully formed from the contributors’ minds nor making up whatever we like, projecting our own views onto a blank slate of a book. In forging and sharing here my own (...) idiosyncratic responses, I reach out to other, future readers by welcoming and inviting creative pushback, aiming to open up options, to accept and expand on the rich fare these authors offer us. (shrink)

Setting the scene -- Sentience and the sentient mind -- Special senses and their interpretation Survival strategies -- Social strategies -- Animals of the waters -- Animals of the air -- Animals of the savannah and plains -- Animals of the forests -- Close neighbours -- Our duty of care.

Here, in a single volume, is a comprehensive and definitive account of pragmatism and classical American philosophy. Pragmatism and Classical American Philosophy, now revised and expanded in this second edition, presents the essential writings of the major philosophers of this tradition: Charles S. Peirce, William James, Josiah Royce, George Santayana, John Dewey, and George Herbert Mead. Illuminating introductory essays, written especially for this volume by distinguished scholars of American philosophy, provide biographical and cultural context as well as original critical (...) and interpretive perspectives. This edition also includes all new selections and interpretive essays that situate pragmatism and classical American philosophy in a wider American philosphical context, including: Ralph Waldo Emerson and transcendentalism; Jane Addams, feminism, and writings of American women; Borden Parker Bowne, personalism, and idealism; Alain Locke and Afro-American thought; and John Herman Randall, Jr., nationalism and realism. Up-to-date suggestions for further reading will benefit both introductory and advanced readers. This American intellectual tradition speaks insightfully, creatively, and critically to our contemporary global society and its pressing problems. In unmatched quality and quantity, Pragmatism and Classical American Philosophy provides the resources necessary to understand and act on these insights. (shrink)

This paper provides a principled and elegant solution to the Gettier problem. The key move is to draw a general metaphysical distinction and conscript it for epistemological purposes. Section 1 introduces the Gettier problem. Sections 2–5 discuss instructively wrong or incomplete previous proposals. Section 6 presents my solution and explains its virtues. Section 7 answers the most common objection.

I consider a serious objection to the knowledge account of assertion and develop a response. In the process I introduce important new data on prompting assertion, which all theorists working in the area should take note of.

How do we acquire thoughts and beliefs about particulars by looking at pictures? One kind of reply essentially compares depiction to perception, holding that picture-perception is a form of remote object-perception. Lopes’s theory that pictures refer by demonstrative identification, and Walton’s transparency theory for photographs, constitute such remote acquaintance theories of depiction. The main purpose of this paper is to defend an alternative conception of pictures, on which they are not suitable for acquainting us with particulars but for acquainting us (...) with certain kinds of properties. This conception is outlined in §4, where it is argued that pictures are useful devices for what Heal has called indexical predication. In §2 and §3, I explain why I believe that remote acquaintance theories are false, and why picture-perception cannot function as a form of extended or remote object-perception. The main reason is that the contents of picture-perceptions do not themselves provide the kind of numerical and contextual information required for singular thought. Picture-reference is instead secured by independent beliefs or linguistic communication about the causal history of pictures as objects. In other words, it is beliefs about the numerical identity of pictures as objects that anchors the reference of the representational contents of pictures. (shrink)

A modern philosopher described religion as “that region in which all the enigmas of the world are solved.” Smith argues in Experience and God that religion itself has become an enigma for modern man. In the book, smith attempts to reunite philosophy with religion. He argues that in recent decades the prevailing attitude has been chiefly one of indifference. This indifference, leading to the failure of understanding can be overcome only through radical reflection and self-criticism: a re-consideration of the nature (...) of religion, its place in the total structure of human life, and its relations to the secular culture in which the faith of man must live. The task Smith lays out must be of a largely philosophical nature, not only because of the necessity to understand religion in relation to a comprehensive scheme of things, but also because the idea of religion is intimately connected with the issues of metaphysics. Smith’s purpose is to bridge the gap between the ontological approach to God as represented by Augustine, Anselm, and Bonaventure, and the cosmological approach represented by Thomas Aquinas and Albert the Great. Smith shows that, although the two approaches significantly differ, they can be interpreted as ways of leading the meditating mind to the Presence of God, through the soul and through the world. (shrink)

It is increasingly recognized that knowledge is the norm of assertion. As this view has gained popularity, it has also garnered criticism. One widely discussed criticism involves thought experiments about “selfless assertion.” Selfless assertions are said to be intuitively compelling examples where agents should assert propositions that they don’t even believe and, hence, don’t know. This result is then taken to show that knowledge is not the norm of assertion. This paper reports four experiments demonstrating that “selfless assertors” are viewed (...) as both believing and knowing the propositions they assert: this is the natural and intuitive way of interpreting the case. Thought experiments about selfless assertions do not threaten the knowledge account and they do not motivate weaker alternative accounts. The discussion also highlights a general lesson for philosophers: thought experiments intended to probe for mental state attributions should not conflict with basic principles that guide social cognition. (shrink)

John Turri gives an example that he thinks refutes what he takes to be “G. E. Moore's view” that omissive assertions such as “It is raining but I do not believe that it is raining” are “inherently ‘absurd'”. This is that of Ellie, an eliminativist who makes such assertions. Turri thinks that these are perfectly reasonable and not even absurd. Nor does she seem irrational if the sincerity of her assertion requires her to believe its content. A commissive counterpart (...) of Ellie is Di, a dialetheist who asserts or believes that The Russell set includes itself but I believe that it is not the case that the Russell set includes itself. Since any adequate explanation of Moore's paradox must handle commissive assertions and beliefs as well as omissive ones, it must deal with Di as well as engage Ellie. I give such an explanation. I argue that neither Ellie's assertion nor her belief is irrational yet both are absurd. Likewise neither Di's assertion nor her belief is irrational yet in contrast neither is absurd. I conclude that not all Moore-paradoxical assertions or beliefs are irrational and that the syntax of Moore's examples is not sufficient for the absurdity found in them. (shrink)

Pragmatism, Postmodernism and the Future of Philosophy is a vigorous and dynamic confrontation with the task and temperament of philosophy today. In this energetic and far-reaching new book, Stuhr draws persuasively on the resources of the pragmatist tradition of James and Dewey, and critically engages the work of Continental philosophers like Adorno, Foucault, and Deleuze, to explore fundamental questions of how we might think and live differently in the future. Along the way, the book addresses important issues in public policy, (...) university administration, spirituality, and the notion of community and its meaning in a global world of difference. This book is essential reading for anyone concerned with the future of philosophy, and the ways in which philosophical thinking can help us live better, more fulfilling lives. (shrink)

Nearly all success is due to some mix of ability and luck. But some successes we attribute to the agent’s ability, whereas others we attribute to luck. To better understand the criteria distinguishing credit from luck, we conducted a series of four studies on knowledge attributions. Knowledge is an achievement that involves reaching the truth. But many factors affecting the truth are beyond our control and reaching the truth is often partly due to luck. Which sorts of luck are compatible (...) with knowledge? We find that knowledge attributions are highly sensitive to lucky events that change the explanation for why a belief is true. By contrast, knowledge attributions are surprisingly insensitive to lucky events that threaten but ultimately fail to change the explanation for why a belief is true. These results shed light on our concept of knowledge, help explain apparent inconsistencies in prior work on knowledge attributions, and constitute progress toward a general understanding of the relation between success and luck. (shrink)