The phenomenon of synesthesia has undergone an invigoration of research interest and empirical progress over the past decade. Studies investigating the cognitive mechanisms underlying synesthesia have yielded insight into neural processes behind such cognitive operations as attention, memory, spatial phenomenology and inter-modal processes. However, the structural and functional mechanisms underlying synesthesia still remain contentious and hypothetical. The first section of the present paper reviews recent research on grapheme-color synesthesia, one of the most common forms of synesthesia, and addresses the ongoing (...) debate concerning the role of selective attention in eliciting synesthetic experience. Drawing on conclusions of the first half, the paper’s second half examines the various models proposed to explain the cognitive mechanisms behind grapheme-color synesthesia, and discusses the explanatory virtues of a new model suggesting that grapheme-color synesthesia is grounded in memory. The last section offers an examination of some of the broader philosophical implications of synesthesia. (shrink)

The structuralist program has developed a useful metascientific resource: ontological reductive links (ORLs) between the constituents of the potential models of reduced and reducing theories. This resource was developed initially to overcome an objection to structuralist ``global'' accounts of the intertheoretic reduction relation. But it also illuminates the way that concepts at a higher level of scientific investigation (e.g., cognitive psychology) become ``structured through reduction'' to lower-level investigations (e.g., cellular/molecular neuroscience). After (briefly) explaining this structuralist background, I demonstrate how this (...) resource illuminates an actual, emerging scientific example: the link between the psychological concept of a ``consolidation switch'' from short-term to long-term memory and the cellular/molecular mechanisms of the transition from early- to late-phases of long-term potentiation (LTP) (an important type of synaptic plasticity in mammalian hippocampus and cortex). (shrink)

The vestibulo-ocular reflex (VOR) adaptation is an ideal model for investigating how the neurosteroid 17 beta-estradiol (E2) contributes to the modification of behavior by regulating synaptic activities. We hypothesized that E2 impacts VOR adaptation by affecting cerebellar synaptic plasticity at the parallel fiber–Purkinje cell (PF) synapse. To verify this hypothesis, we investigated the acute effect of blocking E2 synthesis on gain increases and decreases in adaptation of the VOR in male rats using an oral dose (2.5 mg/kg) of the aromatase (...) inhibitor letrozole. We also assessed the effect of letrozole on synaptic plasticity at the PF synapse in vitro, using cerebellar slices from male rats. We found that letrozole acutely impaired both gain increases and decreases adaptation of the VOR without altering basal ocular-motor performance. Moreover, letrozole prevented long-term potentiation at the PF synapse (PF-LTP) without affecting long-term depression (PF-LTD). Thus, in male rats neurosteroid E2 has a relevant impact on VOR adaptation and affects exclusively PF-LTP. These findings suggest that E2 might regulate changes in VOR adaptation by acting locally on cerebellar and extra-cerebellar synaptic plasticity sites. (shrink)

The purpose of this special issue and the conference that inspired it was to address the issue of conceptual integration in a science of consciousness. We felt this to be important, for while current efforts to scientifically investigate consciousness are taking place in an interdisciplinary context, it often seems as though the very terms being used to sustain a sense of interdisciplinary cooperation are working against it. This is because it is this very array of common concepts that generates a (...) sense of unity among consciousness researchers, despite the fact the concepts mean different things in different disciplines. These Concepts of Consciousness include the following: realism, representation, intentionality, information, control, memory and self. Given this list, we believed we could best approach the issue of potential conceptual integration by addressing each concept from different perspectives and asking the following: how do uses of the concept differ, must these meanings be synthesized in order for there to be a unified science of consciousness, is a unified conceptual scheme necessary to establish an independent science of consciousness, is a unified conceptual scheme possible, if it is not possible, why not, and if it is possible, what might it look like? To this end we invited, for each concept, two scholars who made extensive use of the identified concept in their work. The papers entailed in this special issue constitute the outcome of this effort, and in what follows we offer a brief examination of possible forms of integration the papers seem to collectively suggest. (shrink)

Nitric oxide (NO) is involved in synaptic long-term potentiation (LTP) by multiple signaling pathways. Here, we show that LTP of synaptic transmission can be explained as a feature of signal transduction—bistable behavior in a chain of biochemical reactions with positive feedback, formed by diffusion of NO to the presynaptic site and facilitating the release of glutamate (Glu). The dynamics of Glu, calcium (Ca2+) and NO is described by a system of nonlinear reaction–diffusion equations with modified Michaelis–Menten (MM) kinetics. Numerical (...) investigation reveals that the chain of biochemical reactions analyzed can exhibit a bistable behavior under physiological conditions when production of Glu is described by MM kinetics and decay of NO is modeled by means of two enzymatic pathways with different kinetic properties. Our finding extends understanding of the role of NO in LTP: a short high-intensity stimulus is “memorized” as a long-lasting elevation of NO concentration. The conclusions obtained by analysis of the chain of biochemical reactions describing LTP can be generalized to other chains of interactions or for creating the logical elements for biological computers. (shrink)

Vadim Fedulov,1 Christopher S. Rex,2 Danielle A. Simmons,3 Linda Palmer,4 Christine M. Gall,1,2 and Gary Lynch.

Shors & Matzel set up a straw man, that LTP is a memory storage mechanism, and knock him down without due consideration of the important relations among different levels of organization and analysis regarding LTP, learning, and memory. Assessing these relationships requires analysis and hypotheses linking specific brain regions, neural circuits, plasticity mechanisms, and task demands. The issue addressed by the authors is important, but their analysis is off target.

Individual objects have potentials: paper has the potential to burn, an acorn has the potential to turn into a tree, some people have the potential to run a mile in less than four minutes. Barbara Vetter provides a systematic investigation into the metaphysics of such potentials, and an account of metaphysical modality based on them. -/- In contemporary philosophy, potentials have been recognized mostly in the form of so-called dispositions: solubility, fragility, and so on. Vetter takes dispositions as her starting (...) point, but argues for and develops a more comprehensive conception of potentiality. She shows how, with this more comprehensive conception, an account of metaphysical modality can be given that meets three crucial requirements: Extensional correctness: providing the right truth-values for statements of possibility and necessity; formal adequacy: providing the right logic for metaphysical modality; and semantic utility: providing a semantics that links ordinary modal language to the metaphysics of modality. -/- The resulting view of modality is a version of dispositionalism about modality: it takes modality to be a matter of the dispositions of individual objects. This approach has a long philosophical tradition going back to Aristotle, but has been largely neglected in contemporary philosophy. In recent years, it has become a live option again due to the rise of anti-Humean, powers-based metaphysics. The aim of Potentiality is to develop the dispositionalist view in a way that takes account of contemporary developments in metaphysics, logic, and semantics. (shrink)

ABSTRACT This paper examines three arguments that use the concept of potential to identify embryos that are morally suitable for embryonic stem cell research (ESCR). According to the first argument, due to Ronald Green, the fact that they are scheduled for disposal makes embryos left over from IVF treatments morally appropriate for research. Paul McHugh argues that embryos created by somatic cell nuclear transfer differ from those that result directly from the meeting of sperm and egg in having potential especially (...) conducive to the therapeutic use of their stem cells. I reject both of these arguments. According to the way of making distinctions in embryonic potential that I defend, it is the absence of a functional relationship with a womb that marks embryos morally suitable for ESCR. (shrink)

Some form of potential or "capacity" is often seen as evidence of human moral status. Opinions differ as to whether the potential of the embryo should be regarded as such evidence. In this paper, I discuss some common arguments against regarding the embryo's potential as a sign of human status, together with some less common arguments in favour of regarding the embryo's potential in this way.

IntroductionRights-ethicists intensely debate what properties of an individual are necessary and sufficient in order for that individual to have moral rights. At the heart of this important debate is the issue of whether individuals such as human foetuses, infants, and unconscious adults have moral rights, and if so, what these rights are. This paper focuses on the moral status of unconscious adults, as well as human foetuses, which are potential agents in the sense that they follow a “normal” path of (...) development towards agency. Using Michael Tooley’s (Tooley 1983) and Jeff McMahan’s (McMahan 2002) influential discussions on this topic as a point of departure, this paper defends two claims. (1) Possession of the capacity for autonomous agency that is temporarily “blocked” by sleep or coma is sufficient in order for an individual to have intrinsic worth and thus, moral rights. (2) If possession of the blocked capacity for autonomous agency is sufficient in order for an individual to hav. (shrink)

Vetter (2015) develops a localised theory of modality, based on potentialities of actual objects. Two factors play a key role in its appeal: its commitment to Hardcore Actualism, and to Naturalism. Vetter’s commitment to Naturalism is in part manifested in her adoption of Aristotelian universals. In this paper, we argue that a puzzle concerning the identity of unmanifested potentialities cannot be solved with an Aristotelian conception of properties. After introducing the puzzle, we examine Vetter’s attempt at amending the Aristotelian conception (...) in a way that avoids the puzzle, and conclude that this amended version is no longer to be considered naturalistic. Potentiality theory cannot be both actualist and naturalist. We then argue that, if naturalism is to be abandoned by the actualist, there are good reasons to adopt a Platonist conception of universals, for they offer a number of theoretical advantages and allow us to avoid some of the problems facing Vetter’s theory. (shrink)

Some reasons to regard the cumulative hierarchy of sets as potential rather than actual are discussed. Motivated by this, a modal set theory is developed which encapsulates this potentialist conception. The resulting theory is equi-interpretable with Zermelo Fraenkel set theory but sheds new light on the set-theoretic paradoxes and the foundations of set theory.

The formulation of quantum mechanics as a diffusion process by Nelson provides for an interesting approach on how we may transit from classical mechanics into quantum mechanics. Besides the presence of the real potential function, another type of potential function forms an intrinsic part of this theory. In this paper we attempt to show how both types of potential functions can have a use in a resolutely macroscopic context like financial asset pricing. We are particularly interested in uncovering how the (...) ‘quantum potential’ can add to the economics-based relevant information which is already supplied by the real potential function. (shrink)

Standard quantum mechanics undeniably violates the notion of separability that classical physics accustomed us to consider as valid. By relating the phenomenon of quantum nonseparability to the all-important concept of potentiality, we effectively provide a coherent picture of the puzzling entangled correlations among spatially separated systems. We further argue that the generalized phenomenon of quantum nonseparability implies contextuality for the production of well-defined events in the quantum domain, whereas contextuality entails in turn a structural-relational conception of quantal objects, viewed as (...) carriers of dispositional properties. It is finally suggested that contextuality, if considered as a conditionalization preparation procedure of the object to be measured, naturally leads to a separable concept of reality whose elements are experienced as distinct, well-localized objects having determinate properties. In this connection, we find it necessary to distinguish the meaning of the term reality from the criterion of reality for us. The implications of the latter considerations for the notion of objectivity in quantum mechanics are also discussed. (shrink)

Religion is a significant social force on organizational practice yet has been relatively underexamined in organization theory. In this article, I assert that the institutional logics perspective is especially conducive to examine the macrolevel role of religion for organizations. The notion of the religious logic offers conceptual means to explain the significance of religion, its interrelationship with other institutional orders, and embeddedness into and impact across interinstitutional systems. I argue for intrainstitutional logic plurality and show that specifically the intrareligious logic (...) plurality has been rather disregarded with a relative focus on Christianity and a geographical focus on “the West.” Next, I propose the concept of interinstitutional logic prevalence and show that the religious logic in particular may act as a metalogic due to its potential for uniqueness, ultimacy, and ubiquity. Through illustrations from Islamic Finance and Entrepreneurship, I exemplify implications of logic plurality and prevalence for organizations and societies. (shrink)

Modal potentialism as proposed by Barbara Vetter (2015) is the view that every possibility is grounded in something having a potentiality. Drawing from work by Jessica Leech (2017), Samuel Kimpton-Nye (2021) argues that potentialists can have an S5 modal logic. I present a novel argument to the conclusion that the most straightforward way of spelling out modal potentialism cannot validate an S5 modal logic. Then I will propose a slightly tweaked version of modal potentialism that can validate an S5 modal (...) logic and still does justice to the core claim of potentialism. (shrink)

ABSTRACT Consideration of the potentiality of human embryos to develop characteristics of personhood, such as intellect and will, has figured prominently in arguments against abortion and the use of human embryos for research. In particular, such consideration was the basis for the call of the US President's Council on Bioethics for a moratorium on stem cell research on human embryos. In this paper, I critique the concept of potentiality invoked by the Council and offer an alternative account. In contrast to (...) the Council's view that an embryo's potentiality is determined by definition and is not affected by external conditions that may prevent certain possibilities from ever being realized, I propose an empirically grounded account of potentiality that involves an assessment of the physical and decisional conditions that may restrict an embryo's possibilities. In my view, some human embryos lack the potentiality to become a person that other human embryos have. Assuming for the sake of argument that the potential to become a person gives a being special moral status, it follows that some human embryos lack this status. This argument is then used to support Gene Outka's suggestion that it is morally permissible to experiment on ‘spare’ frozen embryos that are destined to be destroyed. (shrink)

Vetter's Potentiality is an exposition and development of a new account of possibility and necessity, given in terms of potentialities. In this critical notice, I give an outline of some of the key claims of the book. I then raise some issues for the extent to which Vetter's view can accommodate genuine de re modalities, especially those of possible existence and non-existence.

This paper connects two notions: Hart and Mas-Colell’s ‘potential’, related to the value of coalitional games, and Coleman’s earlier notion of ‘power of a collectivity to act’, related to the easiness to make decisions by means of a voting rule.

A higher order potential analysis of moral status clarifies the issues that divide Human Being Theorists who oppose embryo research from Person Theorists who favor embryo research. Higher order potential personhood is transitive if it is active, identity preserving and morally relevant. If the transition from the Second Order Potential of the embryo to the First Order Potential of an infant is transitive, opponents of embryo research make a powerful case for the moral status of the embryo. If it is (...) intransitive, then the Person Theorist can draw lines between levels of moral status that permit embryo research to proceed. (shrink)

By a potential person I shall mean an entity which is not now a person but which is capable of developing into a person, given certain biologically and/or technologically possible conditions. This is admittedly a narrower sense than some would attach to the term ‘potential'. After all, people of the twenty-fifth century, if such there will be, are in some sense potential people now, even though the specific biological entities from which they will develop, i.e. the particular gametes or concepti, (...) do not yet exist. For there do exist, in the reproductive capacities of people now living and in the earth's resources, conditions adequate to produce these future people eventually, provided of course that various possible catastrophes are avoided. Indeed, in some sense of ‘potential’ there have been countless billions of potential people from the beginning of time. But I am concerned not with such remote potentialities but with currently existing entities that are capable of developing into people. (shrink)

In order to understand the nature of human embryos I first distinguish between active and passive potentiality, and then argue that the former is found in human gametes and embryos (even in embryos in vitro that may fail to be implanted) because they all have an indwelling power or capacity to initiate certain changes. Implantation provides necessary conditions for the actualization of that prior, active potentiality. This does not imply that embryos are potential persons that do not deserve the same (...) respect as actual persons. To claim that embryos become persons is to understand the predicate person as a phase sortal, roughly equivalent to adult person. This entails that we would not be essentially persons. In order to explain the traditional understanding of person as a proper sortal rather than a phase sortal, the author distinguishes between proximate and remote potentiality, and shows that, unlike feline embryos, human embryos, by their genetic constitution, possess the remote potentiality to later exercise the typically human activities. It follows that they are already persons essentially. (shrink)

Do fetuses have a right to life in virtue of the fact that they are potential adult human beings? I take the claim that the fetus is a potential adult human being to come to this: if the fetus grows normally there will be an adult human animal that was once the fetus. Does this fact ground a claim to our care and protection? A great deal hangs on the answer to this question. The actual mental and physical capacities of (...) a human fetus are inferior to those of adult creatures generally thought to lack a serious right to life, and the mere fact that a fetus belongs to our species in particular seems morally irrelevant. Consequently, a strong fetal claim to protection rises or falls with the appeal to the fetus's potentiality, for nothing else can justify it. (shrink)

Recent arguments on the ethics of stem cell research have taken a novel approach to the question of the moral status of the embryo. One influential argument focuses on a property that the embryo is said to possess—namely, the property of being an entity with a rational nature or, less controversially, an entity that has the potential to acquire a rational nature—and claims that this property is also possessed by a somatic cell. Since nobody seriously thinks that we have a (...) duty to preserve the countless such cells we wash off our body every day in the shower, the argument is intended as a reductio ad absurdum of the claim that the embryo should be afforded the same moral status as a fully developed human being. This article argues that this argument is not successful and that it consequently plays into the hands of those who oppose embryonic stem cell research. It is therefore better to abandon this argument and focus instead on the different argument that potentiality, as such, is not a sufficient ground for the creation of moral obligations towards the embryo. (shrink)

It is known that the Schrödinger equation may be derived from a hydrodynamic model in which the Lagrangian position coordinates of a continuum of particles represent the quantum state. Using Routh’s method of ignorable coordinates it is shown that the quantum potential energy of particle interaction that represents quantum effects in this model may be regarded as the kinetic energy of additional ‘concealed’ freedoms. The method brings an alternative perspective to Planck’s constant, which plays the role of a hidden variable, (...) and to the canonical quantization procedure, since what is termed ‘kinetic energy’ in quantum mechanics may be regarded literally as energy due to motion. (shrink)

The paper begins with a more carefully stated version of ontologically neutral (ON) logic, originally introduced in (Hailperin, 1997). A non-infinitistic semantics which includes a definition of potential infinite validity follows. It is shown, without appeal to the actual infinite, that this notion provides a necessary and sufficient condition for provability in ON logic.

An attempt to reveal the linguistic and cultural potential of education in the process of learning Russian as a means of communication, of cognition of the linguistic picture of the world and the phenomenon of culture is made in the article. The stages of development of linguocultural concept of teaching Russian language in the Republic of Bashkortostan are presented. New approaches to teaching Russian language are considered. The author shows that in the process of education, elementary literacy of students should (...) be achieved while they are dealing with communicative and socially important tasks contributing to the development and formation of students as linguistic personalities. The author concludes that the actual task of the modern school, which is a successful preparation for the unified state examination, should also be achieved not by increased training before the exam, but provided by the total system of education aimed at the formation of personality with a wide range of language capabilities: a cultural person, well-speaking, correct writing, able to understand and interpret the text, to express their thoughts and feelings in their own texts. Such training involves the ascent of a language personality from basic literacy to formed linguistic, communicative and cultural competences. Theoretical basis and methodological support of the concept are presented in the list of publications. (shrink)

The recent discussions about alternative sources of human embryonic stem cells , while stirring new interest in the developmental potential of the various abnormal embryos or constructs proposed as such sources, also raise questions about the potential of the derived embryonic stem cells. The data on the developmental potential of embryonic stem cells that seem relevant for ethical considerations and aspects of patentability are discussed. Particular attention is paid to the meaning of “totipotency, omnipotency and pluripotency” as illustrated by a (...) comparison of the developmental potential of three-dimensional clusters of blastomeres , embryonic stem cells, somatic or stem cells or other somatic cells. This paper focuses on embryoid bodies and on direct cloning by tetraploid complementation. Usage and patenting of these cells cannot be considered to be ethically sound as long as totipotency and tetraploid complementability of embryonic stem cells are not excluded for the specific cell line in question. Testing this poses an ethical problem in itself and needs to be discussed in the future. (shrink)

Many people face a problem about potentiality: their moral beliefs appear to dictate inconsistent views about the significance of the potentiality to become a healthy adult. Briefly, the problem arises as follows. Consider the following two claims. First, both human babies and cats have moral status, but harms to babies matter more, morally, than similar harms to cats. Second, early human embryos lack moral status. It appears that the first claim can only be true if human babies have more moral (...) status than cats. Among the properties that determine moral status, human babies have no properties other than their potentiality that could explain their having more moral status than cats. So human babies’ potentiality to become adult persons must explain their having more moral status than cats. But then potentiality must raise moral status generally. So early human embryos must have some moral status. It appears that the view that must underlie the first claim implies that the second claim is false. (shrink)

On the basis of definition of the concept ‘methodological potential‘ possibilities of development of the new theoretical and methodical ideas interfaced to the initial concept of collective creative education of Nominative of Ivanov are illustrated. Treatments of such concepts and the phenomena as an education technique, methodical approach of the teacher, methodical system are presented. It is shown as by means of the concept new vision of a problem of productivity and efficiency of educational activity opens. In end the short (...) prospective characteristic of the new pedagogical theory - the theory of a personal choice in pedagogical activity is given. (shrink)

Patient visits are an important opportunity for general practitioners to discuss the risks of smoking and cessation strategies. In Australia, the guidelines on cessation published by the Royal Australian College of General Practitioners represent a key resource for GPs in this regard. The predominant message of the Guidelines is that pharmacotherapy should be recommended as first-line therapy for smokers expressing an interest in quitting. This, however, ignores established evidence about the success of unassisted quitting. Our analysis of the Guidelines identifies (...) a number of potential conflicts of interest which may have affected the advice provided. These include extensive funding by the pharmaceutical industry of sources cited to support the recommendations, and relations between members of the Guidelines Content Advisory Group and the pharmaceutical industry. Recommendations issued by professional bodies have enormous potential impact upon public health and there is a need for the highest levels of scrutiny and transparency in their development. Information about research cited in guidelines should include funding sources, and developers should be free of obvious conflicts of interest. Smoking remains the leading preventable cause of global mortality. Concerns related to pharmaceutical industry funding of research, scientific integrity and recommendations on smoking cessation by medical advisory groups clearly have implications beyond Australia. (shrink)

This volume constitutes the largest collection of writings by the Italian philosopher Giorgio Agamben hitherto published in any language and all but one appear in English for the first time. The essays consider figures in the history of philosophy (Plato, Plotinus, Spinoza, Hegel) and twentieth-century thought (Walter Benjamin, Heidegger, Derrida, Deleuze, the historian Aby Warburg, and the linguist J.-C. Milner). They also examine several central concerns of Agamben: the relation of linguistic and metaphysical categories; messianism in Islamic, Jewish, and Christian (...) theology; and the state and future of contemporary politics. Despite the diversity of the texts collected here, they show a consistent concern for a set of overriding philosophical themes concerning language, history, and potentiality. (shrink)

Morality can hardly perform a function, which is discussed in this chapter, unless it offers directives that not only can but frequently do differ from those of self-interest itself. The idea of potential congruence asserts that the relation between morality and the interests of the individual agent is characterized by a high degree of mutual accommodation, so that the frequency and severity of conflict between these two perspectives is significantly reduced. Conflicts are nevertheless possible in principle, but the extent to (...) which they arise in practice is not fixed or immutable. Instead, the frequency of conflict depends to a considerable degree on the character of the prevailing social and political institutions. Achieving convergence between morality and self-interest is in part a social and political task. The account of the “priority” of morality developed by Thomas Scanlon in his book What We Owe to Each Other is similar in a number of respects to this chapter's account of potential congruence. (shrink)

This study examined the relationship between two types of mathematical flexibility – potential flexibility, which indicates individuals’ knowledge of multiple strategies and strategy efficiency, and practical flexibility, which refers to individuals’ flexible performances when solving math problems. Both types of flexibility were assessed in the domain of linear equation solving. Furthermore, two types of beliefs – self-efficacy and use of flexible cognition – were investigated as potential moderators between potential and practical flexibility. 121 8th grade students from China took part (...) in this study. Results indicate that potential flexibility positively predicted practical flexibility. Additionally, self-efficacy and use of flexible cognition might moderate the relationship between these two types of flexibility, suggesting that potential flexibility may lead to different degrees of practical flexibility depending on different levels of beliefs. Implications of these findings for research on mathematical flexibility and for educational practice are discussed. (shrink)

According to ecological psychology, animals perceive not just the qualities of things in their environment, but their affordances: in James Gibson’s words, ’what things furnish, for good or ill’. I propose a metaphysics for affordances that fits into a contemporary anti-Humean metaphysics of powers or potentialities. The goal is to connect two debates, one in the philosophy of perception and one in metaphysics, that stand to gain much from each other.

Aristotle’s concept of dynamis (potentiality) is distinct from the modern concept of energy. Both concepts have problematic limitations. We need a third alternative that is here called “sway.”.

Neuroscience research, like all science, is vulnerable to the influence of extraneous values in the practice of research, whether in research design or the selection, analysis and interpretation of data. This is particularly problematic for research into the biological mechanisms that underlie behavior, and especially the neurobiological underpinnings of moral development and ethical reasoning, decision-making and behavior, and the other elements of what is often called the neuroscience of ethics. The problem arises because neuroscientists, like most everyone, bring to their (...) work assumptions, preconceptions and values and other sources of potentially inappropriate bias of which they may be unaware. It is important that the training of neuroscientists, and research practice itself, include open and in-depth discussion and examination of the assumptions that underlie research. Further, policy makers, journalists, and the general public, that is, the consumers of neuroscience research findings (and by extension, neurotechnologies) should be made aware of the limitations as well as the strengths of the science, the evolving nature of scientific understanding, and the often invisible values inherent in science. (shrink)