Koonin argues that CRISPR-Cas systems present the best-known case in point for Lamarckian evolution because they satisfy his proposed criteria for the specific inheritance of acquired adaptive characteristics. We see two interrelated issues with Koonin’s characterization of CRISPR-Cas systems as Lamarckian. First, at times he appears to confuse an account of the CRISPR-Cas system with an account of the mechanism it employs. We argue there is no evidence for the CRISPR-Cas system being “Lamarckian” in any sense. Second, it is unclear (...) whether the mechanism is more “Lamarckian” than many other forms of genetic change already well-characterized in Darwinian terms. We present three conceptually distinct senses in which the mechanism of IAC may be considered Lamarckian and argue that only the strongest sense of goal-directed IAC would be difficult to accommodate in a Darwinian account. As the CRISPR-Cas mechanism does not qualify as “Lamarckian” in this strong sense, we argue there is no conceptual value in calling it “Lamarckian”. Finally, we suggest that CRISPR-Cas systems do hold the potential for genuinely non-Darwinian, directed evolution in a way that Koonin did not discuss, involving their potential use as a human gene-editing tool. (shrink)

There is increasing interest today in how the arts contribute to individual and community wellbeing. This scoping review identified and examined ways in which the arts have been used to address wellbeing in communities in the United States. The review examined 44 publications, with combined study populations representing a total of 5,080 research participants, including marginalized populations. It identified the types of artistic practices and interventions being conducted, research methods, and outcomes measured. It highlights positive associations found across a broad (...) spectrum of psychological, physical, and social outcomes, including improvements in self-esteem and identity formation, cognition, physical balance, and physical conditioning. It also reports negative outcomes of arts interventions that may be underreported. The study identifies the need for core outcomes sets and reporting guidelines for advancing evidence synthesis in this area. (shrink)

Many prominent critiques of philosophical methods proceed by suggesting that some method is unreliable, especially in comparison to some alternative method. In light of this, it may seem natural to conclude that these (comparatively) unreliable methods should be abandoned. Drawing upon work on the division of cognitive labour in science, we argue things are not so straightforward. Rather, whether an unreliable method should be abandoned depends heavily on the crucial question of how we should divide philosophers’ time and effort between (...) different methods, in order to maximise our prospects of achieving epistemic success. We show that, in a range of cases, even a (comparatively) unreliable method deserves to be allocated some of these resources. (shrink)

Ancient Confucianism and Daoism are distinct streams of thought, their differences stark at times. But they emerge from and flow through a shared cultural context and historical time. Certain common assumptions are to be found in each, and distinguish both from Western ways of thinking. This chapter considers the particulars of these two ancient Chinese perspectives, and the ways in which they differ from one another. The three key concepts of Confucianism include: humanity, duty, ritual. The Confucian worldview includes many (...) ideas and principles but these offer a starting point. The chapter recognizes Daoism's playful ambiguity and discusses the three concepts: Way (Dao), integrity (de), and non‐action (wuwei). (shrink)

Bestselling author Sam Harris dismantles the most common justification for religious faith-that a moral system cannot be based on science.

In this enlightening book, Sam Harris argues that free will is an illusion but that this truth should not undermine morality or diminish the importance of social and political freedom; indeed, this truth can and should change the way we think about some of the most important questions in life.

How do adolescent girls envision the world of work and their potential place in it? This article considers teen magazines as a possible source for girls’ perceptions about the work world, including their own career futures. The author explores the occupational landscape embedded with in Seventeen magazinein 1992 in both quantitative and qualitative terms. The labor market in Seventeen-land is heavily skewed toward professional occupations, particularly in the entertainment industry. A close reading of the text reveals four primary messages about (...) the world of work: Entertainment careers are a viable and prestigious option, men are the norm as workers, men hold the power, and fashion modeling is the pinnacle of “women’s work. ” The author argues that Seventeen may be promulgating a distinct set of what Collins called “controlling images” directed at predominantly white girls. The findings suggest gender researchers should attend to the connection between the mass media and girl culture. They also underscore the importance of teaching media literacy. (shrink)

Inquiry aims at knowledge. Your inquiry into a question succeeds just in case you come to know the answer. However, combined with a common picture on which misleading evidence can lead knowledge to be lost, this view threatens to recommend a novel form of dogmatism. At least in some cases, individuals who know the answer to a question appear required to avoid evidence bearing on it. In this paper, we’ll aim to do two things. First, we’ll present an argument for (...) this novel form of dogmatism and show that it presents a substantive challenge. Second, we’ll consider a way those who take knowledge to be the aim of inquiry can mount a response. In the course of doing so, we’ll try to get clearer on the normative connections between inquiry, knowledge and evidence gathering. (shrink)

Jones's (1991) issue-contingent model of ethical decision making posits that six dimensions of moral intensity influence decision markers' recognition of an issue as a moral problem and subsequent behavior. He notes that "organizational settings present special challenges to moral agents" (1991, p. 390) and that organizational factors affect "moral decision making and behavior at two points: establishing moral intent and engaging in moral behavior" (1991, p. 391). This model, however, minimizes both the impact of organizational setting and organizational factors on (...) these experiences of ethical issues. In this theory, context is modeled as affecting the moral intent and behavior of the actor rather than directly affecting the issue's moral intensity. Here we look specifically at the effect of context on the moral intensity of ethical issues through a phenomenological study. Our results indicate that in certain environments, context may be critical in affecting the moral intensity of ethical issues. Thus, researchers should consider it more fully when assessing these issues' moral intensity. (shrink)

Sam Harris dismantles the most common justification for religious faith--that a moral system cannot be based on science.

In 2009, health authorities from Taiwan formally attended the 62nd World Health Assembly of the World Health Organization as observers, marking the country’s participation for the first time since 1972. The long process of negotiating this breakthrough has been cited as an example of successful global health diplomacy. This paper analyses this negotiation process, drawing on government documents, formal representations from both sides of the Taiwan Strait, and key informant interviews. The actors and their motivations, along with the forums, practices (...) and outcomes of the negotiation process, are detailed. While it is argued that non-traditional diplomatic action was important in establishing the case for Taiwan’s inclusion at the WHA, traditional concerns regarding Taiwanese sovereignty and diplomatic representation ultimately played a decisive role. The persistent influence of these traditional diplomatic questions illustrates the limits of global health diplomacy. (shrink)

Suppositional theories of conditionals take apparent similarities between supposition and conditionals as a starting point, appealing to features of the former to provide an account of the latter. This paper develops a novel form of suppositional theory, one which characterizes the relationship at the level of semantics rather than at the level of speech acts. In the course of doing so, it considers a range of novel data which shed additional light on how conditionals and supposition interact.

We develop a new version of the causal theory of spacetime. Whereas traditional versions of the theory seek to identify spatiotemporal relations with causal relations, the version we develop takes causal relations to be the grounds for spatiotemporal relations. Causation is thus distinct from, and more basic than, spacetime. We argue that this non-identity theory, suitably developed, avoids the challenges facing the traditional identity theory.

Facing challenges in your relationships, career, health or well-being? Worried important life goals seem to be slipping away? Whether you're faced with day-to-day irritations or facing a larger setback, sometimes life can test your strength and endurance. But there is a simple and effective way to building your resilience in the face of adversity, making sure that you can bounce back from them stronger than ever before and go on to achieve your goals and lead a happier, more fulfilled life. (...) This step-by-step guide takes you through how to build your everyday resilience. From powerful lessons on the effects of our thoughts, emotions, relationships and self-care, to tips on setting goals that genuinely motivate and turning challenges on their heads, it makes the road to success and happiness easy and - best of all - enjoyable. (shrink)

The curriculum design, faculty characteristics, and experience of implementing masters' level international research ethics training programs supported by the Fogarty International Center was investigated. Multiple pedagogical approaches were employed to adapt to the learning needs of the trainees. While no generally agreed set of core competencies exists for advanced research ethics training, more than 75% of the curricula examined included international issues in research ethics, responsible conduct of research, human rights, philosophical foundations of research ethics, and research regulation and ethical (...) review process. Common skills taught included critical thinking, research methodology and statistics, writing, and presentation proficiency. Curricula also addressed the cultural, social, and religious context of the trainees related to research ethics. Programs surveyed noted trainee interest in Western concepts of research ethics and the value of the transnational exchange of ideas. Similar faculty expertise profiles existed in all programs. Approximately 40% of faculty were female. Collaboration between faculty from low- and middleincome countries (LMICs) and high-income countries (HICs) occurred in most programs and at least 50% of HIC faculty had previous LMIC experience. This paper is part of a collection of papers analyzing the Fogarty International Research Ethics Education and Curriculum Development program. (shrink)

Think of a number, any number, or properties like fragility and humanity. These and other abstract entities are radically different from concrete entities like electrons and elbows. While concrete entities are located in space and time, have causes and effects, and are known through empirical means, abstract entities like meanings and possibilities are remarkably different. They seem to be immutable and imperceptible and to exist "outside" of space and time. This book provides a comprehensive critical assessment of the problems raised (...) by abstract entities and the debates about existence, truth, and knowledge that surround them. It sets out the key issues that inform the metaphysical disagreement between platonists who accept abstract entities and nominalists who deny abstract entities exist. Beginning with the essentials of the platonist–nominalist debate, it explores the key arguments and issues informing the contemporary debate over abstract reality: arguments for platonism and their connections to semantics, science, and metaphysical explanation the abstract–concrete distinction and views about the nature of abstract reality epistemological puzzles surrounding our knowledge of mathematical entities and other abstract entities. arguments for nominalism premised upon concerns about paradox, parsimony, infinite regresses, underdetermination, and causal isolation nominalist options that seek to dispense with abstract entities. Including chapter summaries, annotated further reading, and a glossary, _Entities_ is essential reading for anyone seeking a clear and authoritative introduction to the problems raised by abstract entities. (shrink)

Standard approaches to counterfactuals in the philosophy of explanation are geared toward causal explanation. We show how to extend the counterfactual theory of explanation to non-causal cases, involving extra-mathematical explanation: the explanation of physical facts by mathematical facts. Using a structural equation framework, we model impossible perturbations to mathematics and the resulting differences made to physical explananda in two important cases of extra-mathematical explanation. We address some objections to our approach.

Kant proclaimed that all theodicies must fail in ?On the Miscarriage of All Philosophical Trials in Theodicy?, but it is mysterious why he did so since he had developed a theodicy of his own during the critical period. In this paper, I offer an explanation of why Kant thought theodicies necessarily fail. In his theodicy, as well as in some of his works in ethics, Kant explained moral evil as resulting from unavoidable limitations in human beings. God could not create (...) finite beings without such limitations and so could not have created humans that were not prone to committing immoral acts. However, the work of Carl Christian Eberhard Schmid showed Kant that given his own beliefs about freedom and the nature of responsibility one could not account for moral evil in this way without tacitly denying that human beings were responsible for their actions. This result is significant not only because it explains an otherwise puzzling shift in Kant's philosophy of religion, but also because it shows that the theodicy essay provides powerful evidence that Kant's thinking about moral evil and freedom underwent fundamental shifts between early works such as the Groundwork and later works like the Religion within the Limits of Mere Reason. (shrink)

On a now orthodox view, humans and many other animals possess a “number sense,” or approximate number system, that represents number. Recently, this orthodox view has been subject to numerous critiques that question whether the ANS genuinely represents number. We distinguish three lines of critique – the arguments from congruency, confounds, and imprecision – and show that none succeed. We then provide positive reasons to think that the ANS genuinely represents numbers, and not just non-numerical confounds or exotic substitutes for (...) number, such as “numerosities” or “quanticals,” as critics propose. In so doing, we raise a neglected question: numbers of what kind? Proponents of the orthodox view have been remarkably coy on this issue. But this is unsatisfactory since the predictions of the orthodox view, including the situations in which the ANS is expected to succeed or fail, turn on the kind of number being represented. In response, we propose that the ANS represents not only natural numbers, but also non-natural rational numbers. It does not represent irrational numbers, however, and thereby fails to represent the real numbers more generally. This distances our proposal from existing conjectures, refines our understanding of the ANS, and paves the way for future research. (shrink)

The history of ideas is an interdisciplinary field that began as an offshoot of the history of philosophy and was transformed by notions of perspective and cultural context drawn from the tradition of historical studies. The result is the practice of intellectual history, which has been carried out between the poles of inquiry commonly known as internalist and externalist, corresponding to mental phenomena and collective behavior in cultural surroundings. These are not opposed but rather complementary methods, and intellectual history may (...) be seen as the inside of cultural history and cultural history as the outside of intellectual history, the intellectual historian's task being to bring the two into alliance. (shrink)

The popularity of ‘food sovereignty’ to cover a range of positions, interventions, and struggles within the food system is testament, above all, to the term’s adaptability. Food sovereignty is centrally, though not exclusively, about groups of people making their own decisions about the food system—it is a way of talking about a theoretically-informed food systems practice. Since people are different, we should expect decisions about food sovereignty to be different in different contexts, albeit consonant with a core set of principles (...) (including women’s rights, a shared opposition to genetically modified crops, and a demand for agriculture to be removed from current international trade agreements). In this paper we look at the analytical points of friction in applying ideas of food sovereignty within the context of Indigenous struggles in North America. This, we argue, helps to clarify one of the central themes in food sovereignty: that it is a continuation of anti-colonial struggles, even in post-colonial contexts. Such an examination has dividends both for scholars of food sovereignty and for those of Indigenous politics: by helping to problematize notions of food sovereignty and postcoloniality, but also by posing pointed questions around gender for Indigenous struggles. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Journal of the History of Ideas 62.4 (2001) 577-592 [Access article in PDF] Eclecticism and the History of Ideas Donald R. Kelley "What we call the history of ideas," Joseph Mazzeo wrote in in 1972, "itself has a history." 1 In this country the history of ideas in the past century has been associated with the American philosopher and founder of this journal, Arthur O. Lovejoy, and his (...) epigones and critics. However, this field has an earlier history sub literam, going back almost two centuries, and a still deeper prehistory before the coinage of the phrase, traceable at least indirectly back to antiquity. The purpose of this essay is to trace some aspects of one intellectual tradition out of which the history of ideas has, knowingly or not, emerged.In 1829 Victor Cousin gave a diagnosis of and his prescription for philosophy in the wake of one revolution and on the threshold of another. He saw just three possibilities: either it could renounce its independence and submit again to authority, it could keep on retracing the circle of obsolescent systems, or--and this was his solution--it could "disengage what is true in each of these systems, and thus construct a philosophy superior to all systems [and] shall be neither this or that philosophy in its essence and in its unity." This procedure, "to select in all what appears to be true and good, and consequently everlasting,--this, in a single word, is ECLECTICISM." Moreover, Cousin added, "[i]f this philosophy is to be Eclectic, it must also be sustained by the history of philosophy."How had Cousin come upon this program? In December 1815, in the first year of both the Restoration Monarchy and his teaching at the École Normale Supérieure, he was lecturing on the history of philosophy. In post-revolutionary France this was a field in great disarray, and Cousin looked back to the great schools of the earlier generation, noting three in particular--the French, the [End Page 577] Scottish, and the German traditions, represented respectively by Condillac, Reid, and Kant. "It would be an interesting and instructive study," he told his enthusiastic young students, "to examine the weaknesses of these schools by engaging one with another and by selecting their various merits in the context of a great eclecticism which would contain and surpass all three." 2Over the next three decades this doctrine was publicized and extended by Cousin's many scholarly publications, by the still more famous lectures he gave after returning to his chair of philosophy in 1828, by his many international contacts and disciples, and by his later public career as minister of education. 3 For half a century before his death in 1867 Cousin had an unparalleled intellectual influence as virtually the "official philosopher" in France, with Eclecticism being widely regarded as a "state philosophy," 4 and translations of his works extending his renown into other parts of Europe and this country. In defending his achievements and hegemonic position Cousin claimed an absolute originality and a unique truth-value for his ideas. Eclecticism had not been drawn from German sources, he protested in 1855. "It was born spontaneously in our own spirit [notre esprit] from the spectacle of the resounding conflicts and the hidden harmonies of the three great philosophical schools of the eighteenth century," he declared. "Thus," he concluded, "eclecticism is a French doctrine and peculiar to us." 5Historically speaking, however, nothing could be further from the truth--or indeed further from the premises of the earlier eclectic tradition on which Cousin knowingly drew. The defining characteristic of his philosophy was its dependence not only on the three schools he recognized in his early years of teaching but on the whole history of philosophy from its Greek and especially Platonic beginnings, to which Cousin himself devoted much of his historical and philological [End Page 578] scholarship. That Eclecticism was a sort of higher plagiarism was admitted by Cousin himself: "What I recommend," Cousin said in 1817, "is an enlightened eclecticism which, judging with equity, and even with benevolence... (shrink)

The theoretical virtue of parsimony values the minimizing of theoretical commitments, but theoretical commitments come in two kinds : ontological and ideological. While the ontological commitments of a theory are the entities it posits, a theory’s ideological commitments are the primitive concepts it employs. Here, I show how we can extend the distinction between quantitative and qualitative parsimony, commonly drawn regarding ontological commitments, to the domain of ideological commitments. I then argue that qualitative ideological parsimony is a theoretical virtue. My (...) defense proceeds by demonstrating the merits of qualitative ideological parsimony and by showing how the qualitative conception of ideological parsimony undermines two notable arguments from ideological parsimony: David Lewis’ defense of modal realism and Ted Sider’s defense of mereological nihilism. (shrink)

Formal models of appearance and reality have proved fruitful for investigating structural properties of perceptual knowledge. This paper applies the same approach to epistemic justification. Our central goal is to give a simple account of The Preface, in which justified belief fails to agglomerate. Following recent work by a number of authors, we understand knowledge in terms of normality. An agent knows p iff p is true throughout all relevant normal worlds. To model The Preface, we appeal to the normality (...) of error. Sometimes, it is more normal for reality and appearance to diverge than to match. We show that this simple idea has dramatic consequences for the theory of knowledge and justification. Among other things, we argue that a proper treatment of The Preface requires a departure from the internalist idea that epistemic justification supervenes on the appearances and the widespread idea that one knows most when free from error. (shrink)

This paper refines a controversial proposal: that core systems belong to a perceptual kind, marked out by the format of its representational outputs. Following Susan Carey, this proposal has been understood in terms of core representations having an iconic format, like certain paradigmatically perceptual outputs. I argue that they don’t, but suggest that the proposal may be better formulated in terms of a broader analogue format type. Formulated in this way, the proposal accommodates the existence of genuine icons in perception, (...) and avoids otherwise troubling objections. (shrink)

Long before Luc Besson shot Fifth Element (1997) in English, and long before the squabble over whether Jean-Pierre Jeunet’s Un long dimanche de fiançailles (A Very Long Engagement [2004]) was really a French film or a Warner Brothers’ film, the “national” in French national cinema was complicated. And yet a quick glance at the course offerings of most film departments will tell us that the discipline of Film Studies persists in employing a national cinema model when conceptualizing non-Hollywood cinema. In (...) fact, French cinema has been global from its inception, if we think of globalization as the “increasing speed, ease, and extent with which capital, goods, services, technologies, people, cultures, information .. (shrink)

Notes and Discussions Philodoxy: Mere Opinion and Question of History the "Philosophy as... rigorous science-- the dream is over." Edmund Husserl 1. MERE OPINION From the beginning philosophy has not only had a love affair with wisdom but also a special claim on truth and a concomitant contempt for mere opinion. Parmenides left a poem in which he contrasted the "way of truth," which was the path taken by Plato and his followers, with the "way of opinion," which was paved (...) with falsehood and deceit.' Arcesilaus defended opinion in the sense that he refused to concede certain truth to any ideas2 On such grounds Cicero concluded that the wise man should hold no opinions.s In the self-constituting canon of philosophy "opinion" has always been a pejorative term, designating an inferior sort of knowledge based not on demon- stration but on belief and associated in particular with the much-maligned Sophists, who languished under a "dark shadow" for centu- ries.4 As Macrobius wrote: "Opinion is born of failure of memory," meaning the preexistent form of knowledge -- ideas -- which was Platonic recollection;5 and for Aquinas, "opinion is knowledge of those things about which we do not have certain knowledge. ''6 In general, questions of "opinion" or "prejudice" have seldom been posed by 'Jonathan Barnes, The Presocratic Philosophers , 156. See also T. Sprute, Der Begriff der doxa in der platonische.. (shrink)

Notes and Discussions Philodoxy: Mere Opinion and Question of History the "Philosophy as... rigorous science-- the dream is over." Edmund Husserl 1. MERE OPINION From the beginning philosophy has not only had a love affair with wisdom but also a special claim on truth and a concomitant contempt for mere opinion. Parmenides left a poem in which he contrasted the "way of truth," which was the path taken by Plato and his followers, with the "way of opinion," which was paved (...) with falsehood and deceit.' Arcesilaus defended opinion in the sense that he refused to concede certain truth to any ideas2 On such grounds Cicero concluded that the wise man should hold no opinions.s In the self-constituting canon of philosophy "opinion" has always been a pejorative term, designating an inferior sort of knowledge based not on demon- stration but on belief and associated in particular with the much-maligned Sophists, who languished under a "dark shadow" for centu- ries.4 As Macrobius wrote: "Opinion is born of failure of memory," meaning the preexistent form of knowledge -- ideas -- which was Platonic recollection;5 and for Aquinas, "opinion is knowledge of those things about which we do not have certain knowledge. ''6 In general, questions of "opinion" or "prejudice" have seldom been posed by 'Jonathan Barnes, The Presocratic Philosophers, 156. See also T. Sprute, Der Begriff der doxa in der platonische... (shrink)

A number of philosophers have argued in favour of extended simples on the grounds that they are needed by fundamental physics. The arguments typically appeal to theories of quantum gravity. To date, the argument in favour of extended simples has ignored the fact that the very existence of spacetime is put under pressure by quantum gravity. We thus consider the case for extended simples in the context of different views on the existence of spacetime. We show that the case for (...) extended simples based on physics is far more complex than has been previously thought. We present and then map this complexity, in order to present a much more textured picture of the argument for extended simples. (shrink)

How do we know what an amoeba looks like? How can doctors see the details of our skeletons and internal organs? All of these things are made possible through the innovations of photography. The author provides a primer on the applications of photography to science as she explores the multiple facets of this complex relationship.

Some critics argue that the types of psychiatric diagnosis found in the Diagnostic and Statistical Manual of Mental Disorders and International Classification of Disease are superfluous and should be abandoned. These are known as categorical polythetic psychiatric diagnoses. To receive a categorical polythetic psychiatric diagnosis an individual need only exhibit some, rather than all, of the symptoms on the diagnostic criteria. Consequently, categorical polythetic psychiatric diagnoses only associate an individual with a range of symptoms rather than specify which symptoms they (...) have. Drawing on Giere’s account of scientific models, I portray categorical polythetic psychiatric diagnoses as abstract models that guide the building of less abstract models. These models can specify which symptoms a particular individual has. Additionally, categorical polythetic psychiatric diagnoses can guide investigation of symptoms towards difficult to spot symptoms, guide investigation towards changing symptoms, and guide investigation towards how symptoms manifest. These important roles mean categorical polythetic psychiatric diagnoses should not be abandoned. (shrink)

Jerry Fodor deemed informational encapsulation ‘the essence’ of a system’s modularity and argued that human perceptual processing comprises modular systems, thus construed. Nowadays, his conclusion is widely challenged. Often, this is because experimental work is seen to somehow demonstrate the cognitive penetrability of perceptual processing, where this is assumed to conflict with the informational encapsulation of perceptual systems. Here, I deny the conflict, proposing that cognitive penetration need not have any straightforward bearing on the conjecture that perceptual processing is composed (...) of nothing but informationally encapsulated modules, the conjecture that each and every perceptual computation is performed by an informationally encapsulated module, and the consequences perceptual encapsulation was traditionally expected to have for a perception-cognition border, the epistemology of perception and cognitive science. With these points in view, I propose that particularly plausible cases of cognitive penetration would actually seem to evince the encapsulation of perceptual systems rather than refute/problematize this conjecture. (shrink)

According to the modal view, essence admits of reductive analysis in exclusively modal terms. Fine (1994) argues that modal view delivers an inadequate analysis of essence. This paper defends the modal view from Fine's challenge. This defense proceeds by examining the disagreement between Finean primitivists and Quinean eliminativists about essence. In order to model this disagreement, a distinction between essence and a separable concept, nature, is required. This distinction is then used to show that Fine's challenge is misdirected and therefore (...) unsuccessful. (shrink)

Mathematics appears to play a genuine explanatory role in science. But how do mathematical explanations work? Recently, a counterfactual approach to mathematical explanation has been suggested. I argue that such a view fails to differentiate the explanatory uses of mathematics within science from the non-explanatory uses. I go on to offer a solution to this problem by combining elements of the counterfactual theory of explanation with elements of a unification theory of explanation. The result is a theory according to which (...) a counterfactual is explanatory when it is an instance of a generalized counterfactual scheme. (shrink)