The perception of separation between school and home/community is related to diminished achievement in school and lack of motivation to learn STEM subjects. The National Council of Educational Research and Training is among many research organisations that have strongly recommended that schools bridge the disconnect between school-based knowledge and learners’ everyday knowledge. We designed the SPIRALS curriculum to bridge this gap between formal science and students’ everyday lives. SPIRALS helps students explore community-based practices to learn about science, environmental sustainability and (...) systems thinking. We implemented the SPIRALS curriculum in a private, urban, English medium school in Western India with approximately 315 students and their four teachers, 214 of whom also participated in the research from which our conclusions are drawn. Our findings about program impacts rely upon analysis of interviews with teachers and students, as well as student work, and conference participation assessment surveys distributed after a capstone experience at which students present their work. This chapter describes our findings about how students learned science, environmental sustainability, and systems thinking through engagement with community-based practices. We also discuss the process of how the SPIRALS approach worked in India and how it could be expanded into a broader learning model across different socio-cultural contexts within India. (shrink)

This article considers two arguments that purport to show that inductive reasoning is unjustified: the argument adduced by Sextus Empiricus and the (better known and more formidable) argument given by Hume in the Treatise. While Sextus’ argument can quite easily be rebutted, a close examination of the premises of Hume’s argument shows that they are seemingly cogent. Because the sceptical claim is very unintuitive, the sceptical argument constitutes a paradox. And since attributions of justification are theoretical, and the claim that (...) they are never (or seldom) true isn’t preposterous, the correct response to the paradox may well be to admit that the sceptic has exposed our error in making them. (shrink)

Ruth Garrett Millikan presents a strikingly original account of how we get to grips with the world in thought. Her question is Kant's 'How is knowledge possible?', answered from a contemporary naturalist standpoint. We begin with an understanding of what the world is like prior to cognition, then develop a theory of cognition within that world.

As arti® cial intelligence moves ever closer to the goal of producing fully autonomous agents, the question of how to design and implement an arti® cial moral agent (AMA) becomes increasingly pressing. Robots possessing autonomous capacities to do things that are useful to humans will also have the capacity to do things that are harmful to humans and other sentient beings. Theoretical challenges to developing arti® cial moral agents result both from controversies among ethicists about moral theory itself, and from (...) computational limits to the implementation of such theories. In this paper the ethical disputes are surveyed, the possibility of a `moral Turing Test ’ is considered and the computational di culties accompanying the diŒerent types of approach are assessed. Human-like performance, which is prone to include immoral actions, may not be acceptable in machines, but moral perfection may be computationally unattainable. The risks posed by autonomous machines ignorantly or deliberately harming people and other sentient beings are great. The development of machines with enough intelligence to assess the eŒects of their actions on sentient beings and act accordingly may ultimately be the most important task faced by the designers of arti® cially intelligent automata. (shrink)

Ruth Millikan is well known for having developed a strikingly original way for philosophers to seek understanding of mind and language, which she sees as biological phenomena. She now draws together a series of groundbreaking essays which set out her approach to language. Guiding the work of most linguists and philosophers of language today is the assumption that language is governed by prescriptive normative rules. Millikan offers a fundamentally different way of viewing the partial regularities that language displays, comparing (...) them to biological norms that emerge from natural selection. This yields novel and quite radical consequences for our understanding of the nature of public linguistic meaning, the process of language understanding, how children learn language, and the semantics/pragmatics distinction. (shrink)

This book offers a powerful response to what Varner calls the "two dogmas of environmental ethics"--the assumptions that animal rights philosophies and anthropocentric views are each antithetical to sound environmental policy. Allowing that every living organism has interests which ought, other things being equal, to be protected, Varner contends that some interests take priority over others. He defends both a sentientist principle giving priority to the lives of organisms with conscious desires and an anthropocentric principle giving priority to (...) certain very inclusive interests which only humans have. He then shows that these principles not only comport with but provide significant support for environmental goals. (shrink)

In liberal political theory, meaningful work is conceptualised as a preference in the market. Although this strategy avoids transgressing liberal neutrality, the subsequent constraint upon state intervention aimed at promoting the social and economic conditions for widespread meaningful work is normatively unsatisfactory. Instead, meaningful work can be understood to be a fundamental human need, which all persons require in order to satisfy their inescapable interests in freedom, autonomy, and dignity. To overcome the inadequate treatment of meaningful work by liberal political (...) theory, I situate the good of meaningful work within a liberal perfectionist framework, from which standpoint I develop a normative justification for making meaningful work the object of political action. To understand the content of meaningful work, I make use of Susan Wolf’s distinct value of meaningfulness, in which she brings together the dimensions of objectivity and subjectivity into the ‘bipartite value’ of meaningfulness (BVM) (Wolf, Meaning in life and why it matters, 2010). However, in order to be able to incorporate the BVM into our lives, we must become valuers, that is, co-creators of values and meanings. This demands that we acquire the relevant capabilities and status as co-authorities in the realm of value. I conclude that meaningful work is of first importance because it is a fundamental human need, and that society ought to be arranged to allow as many people as possible to experience their work as meaningful through the development of the relevant capabilities. (shrink)

Drawing heavily on recent empirical research to update R.M. Hare's two-level utilitarianism and expand Hare's treatment of "intuitive level rules," Gary Varner considers in detail the theory's application to animals while arguing that Hare should have recognized a hierarchy of persons, near-persons, & the merely sentient.

A list of groceries, Professor Anscombe once suggested, might be used as a shopping list, telling what to buy, or it might be used as an inventory list, telling what has been bought (Anscombe 1957). If used as a shopping list, the world is supposed to conform to the representation: if the list does not match what is in the grocery bag, it is what is in the bag that is at fault. But if used as an inventory list, the (...) representation is supposed to conform to the world: if the list does not match what is in the bag, it is the list that is at fault. The first kind of representation, where the world is supposed to conform to the list, can be called "directive"; it represents or directs what is to be done. The second, where the list is supposed to conform to the world, can be called "descriptive"; it represents or describes what is the case. I wish to propose that there exist representations that face both these ways at once. With apologies to Dr. Doolittle, I call them pushmi-pullyu representations or PPRs. (shrink)

" Biosemantics " was the title of a paper on mental representation originally printed in The Journal of Philosophy in 1989. It contained a much abbreviated version of the work on mental representation in Language Thought and Other Biological Categories. There I had presented a naturalist theory of intentional signs generally, including linguistic representations, graphs, charts and diagrams, road sign symbols, animal communications, the "chemical signals" that regulate the function of glands, and so forth. But the term " biosemantics " (...) has usually been applied only to the theory of mental representation. Let me first characterize a more general class of theories called "teleological theories of mental content" of which biosemantics is an example. Then I will discuss the details that distinguish biosemantics from other naturalistic teleological theories. (shrink)

In this article, we illuminate the affective phenomenon of loneliness by exploring the question of how it relates to love and other forms of friendship. We reflect in particular on the question of how different forms of loneliness are relevant to human existence. Distinguishing three forms of loneliness, we first introduce two border cases of loneliness: unfelt loneliness in which one’s individuality is denied and one therefore cannot feel lonely; and existential loneliness in which the possibility of intimacy and existential (...) communication are denied and one therefore cannot but feel lonely. We then turn to loneliness that occurs within intimate friendships—even the most intimate ones. In our analysis, we pay attention especially to the role of communication. In order to do so, we repeatedly turn to poetic expressions of loneliness. We argue that loneliness cannot reflect only the absence or partial failure of communication but also the inherent limits of communication. These limits in turn point back to the nature of human existence and love itself. (shrink)

Racial Battle Fatigue is described as the physical and psychological toll taken due to constant and unceasing discrimination, microagressions, and stereotype threat. This edited volume looks at RBF from the perspectives of graduate students, middle level academics, and chief diversity officers at major institutions of learning.

In this interview, Ruth Groff discusses how she came to be a realist, her role as a community organizer, her relationship to critical realism, and various issues arising from her published work over the years. Discussion ranges across the nature of positivism and its legacy, the concept of falsehood, realism about causal powers, mind-independent reality, the history of philosophy, and the underlying interest in ideology-critique that runs through her thinking.

A leading scholar in the psychology of thinking and reasoning argues that the counterfactual imagination—the creation of "if only" alternatives to ...

In this article, we investigate the relationship between loneliness and misogyny amongst the online movement of “involuntary celibates” (incels) that has become widely known through several violent attacks. While loneliness plays a prominent role in the incels’ self-descriptions, we lack a comprehensive analysis of their experience of loneliness and its role in their radicalization. Our article offers such an analysis. We analyze how loneliness is felt, described, and implicitly understood by incels, investigate the normative presumptions underlying their experiences, and critically (...) reflect on the political function of their discourse of loneliness. We claim that it is the affective mechanism of ressentiment that transforms loneliness into antagonistic emotions and show how loneliness is exacerbated rather than alleviated through the incel community. Finally, we point to the relevance of our analysis for contemporary philosophical and feminist loneliness studies. (shrink)

In his recent essay on moral pluralism in environmental ethics, J. Baird Callicott exaggerates the advantages of monism, ignoring the environmentally unsound implications of Leopold’s holism. In addition, he fails to see that Leopold’s view requires the same kind of intellectual schitzophrenia for which he criticizes the version of moral pluralism advocated by Christopher D. Stone in Earth and Other Ethics. If itis plausible to say that holistic entities like ecosystems are directly morally considerable-and that is a very big if-it (...) must be for a very different reason than is usually given for saying that individual human beings are directly morally considerable. (shrink)

This volume powerfully examines divides and mistrust between urban communities and police. The essays challenge readers to contemplate how eroding trust developed, the concerns and challenges facing divided communities, and possible pathways forward considering whose lives matter.

This volume provides a concentrated and powerful dialog about the nexus between schools, prisons, and the free-market economy where youth are on fast tracks from schools to prisons.

This book critically examines nine pre-service teacher candidates, and the author’s experience, to explore the ways in which white educators manifest understandings of white racial identity and professional choice through oral narratives. Ultimately the text proposes a new, non-developmental model for thinking about white racial identity.

This book critically examines nine pre-service teacher candidates, and the author’s experience, to explore the ways in which white educators manifest understandings of white racial identity and professional choice through oral narratives. Ultimately the text proposes a new, non-developmental model for thinking about white racial identity.

In his recent article Should Trees Have Standing? Revisited" Christopher D. Stone has effectively withdrawn his proposal that natural objects be granted legal rights, in response to criticism from the Feinberg/McCloskey camp. Stone now favors a weaker proposal that natural objects be granted what he calls legal "considerateness". I argue that Stone's retreat is both unnecessary and undesirable. I develop the notion of a "de facto" legal right and argue that species already have de facto legal rights as statutory beneficiaries (...) of the "Endangered Species Act of 1973." I conclude that granting certain nonhuman natural entities legal rights is both more important and less costly that Stone and his critics have realized, and that it is not Stone's original proposal which needs rethinking, but the concept of interests at work in the Feinberg/McCloskey position. (shrink)

In his recent essay on moral pluralism in environmental ethics, J. Baird Callicott exaggerates the advantages of monism, ignoring the environmentally unsound implications of Leopold’s holism. In addition, he fails to see that Leopold’s view requires the same kind of intellectual schitzophrenia for which he criticizes the version of moral pluralism advocated by Christopher D. Stone in Earth and Other Ethics. If itis plausible to say that holistic entities like ecosystems are directly morally considerable-and that is a very big if-it (...) must be for a very different reason than is usually given for saying that individual human beings are directly morally considerable. (shrink)

Charles Taylor is one of the most influential and prolific philosophers in the English-speaking world today. The breadth of his writings is unique, ranging from reflections on artificial intelligence to analyses of contemporary multicultural societies. This thought-provoking introduction to Taylor's work outlines his ideas in a coherent and accessible way without reducing their richness and depth. His contribution to many of the enduring debates within Western philosophy is examined and the arguments of his critics assessed. Taylor's reflections on the topics (...) of moral theory, selfhood, political theory and epistemology form the core chapters within the book. Ruth Abbey engages with the secondary literature on Taylor's work and suggests that some criticisms by contemporaries have been based on misinterpretations and suggests ways in which a better understanding of Taylor's work leads to different criticisms of it. The book serves as an ideal companion to Taylor's ideas for students of philosophy and political theory, and will be welcomed by the non-specialist looking for an authoritative guide to Taylor's large and challenging body of work. (shrink)

By whatever general principles and mechanisms animal behavior is governed, human behavior control rides piggyback on top of the same or very similar mechanisms. We have reflexes. We can be conditioned. The movements that make up our smaller actions are mostly caught up in perception-action cycles following perceived Gibsonian affordances. Still, without doubt there are levels of behavior control that are peculiar to humans. Following Aristotle, tradition has it that what is added in humans is rationality ("rational soul"). Rationality, however, (...) can be and has been characterized in many different ways. I am going to speculate about two different kinds of cognitive capacities that we humans seem to have, each of which is at least akin to rationality as Aristotle described it. The first I believe we share with many other animals, the second perhaps with none. Since this session of the conference on rational animals has been designated a "brainstorming" session, I will take philosopher's license, presenting no more than the softest sort of intuitive evidence for these ideas. (shrink)

Calls are increasing for American health care to be organized as a learning health care system, defined by the Institute of Medicine as a health care system “in which knowledge generation is so embedded into the core of the practice of medicine that it is a natural outgrowth and product of the healthcare delivery process and leads to continual improvement in care.” We applaud this conception, and in this paper, we put forward a new ethics framework for it. No such (...) framework has previously been articulated. The goals of our framework are twofold: to support the transformation to a learning health care system and to help ensure that learning activities carried out within such a system are conducted in an ethically acceptable fashion. (shrink)

In this article, I provide a philosophical analysis of the nature and role of perceived identity threats in the genesis and maintenance of fanaticism. First, I offer a preliminary definition of fanaticism as the social identity-defining devotion to a sacred value that demands universal recognition and is complemented by a hostile antagonism toward people who dissent from one’s group’s values. The fanatic’s hostility toward dissent thereby takes the threefold form of outgroup hostility, ingroup hostility, and self-hostility. Second, I provide a (...) detailed analysis of the fears of fanaticism, arguing that each of the three aforementioned forms of hostile antagonism corresponds to one form of fear or anxiety: the fanatic’s fear of the outgroup, renegade members of the ingroup, and problematic aspects of themselves. In each of these three forms of fear, the fanatic experiences both their sacred values and their individual and social identity as being threatened. Finally, I turn to a fourth form of fear or anxiety connected to fanaticism, namely the fanatic’s anxiety of and flight from the existential condition of uncertainty itself, which, at least in some cases, ground the fanatic’s fearfulness. (shrink)

There is an urgent need to understand how private and public organisations can play a role in promoting human values such as fairness, dignity, respect and care. Globalisation, technological advance and climate change are changing work, organisations and systems in ways which foster inequality, alienation and collective risk. Against this backdrop, organisations are being urged to make their contribution to the common good, take account of the interests of multiple stakeholders, and respond ethically as well as efficiently to complex challenges (...) which transcend traditional organisational and state boundaries. Ethics, Meaningfulness, and Mutuality poses critical questions related to organisational design by challenging limits to current thinking, such as the neglect by political philosophers of markets, firms and stakeholders, or by organisational theorists of business ethics. In so doing, the book advances our understanding of the theory and practice of ethical organising. Specifically, meaningfulness and mutuality will be used to yield values and principles for a philosophy of ethical organising which includes an account of human values in morally desirable collective action, and examines the relationship of collective action to the contested concept of shared value creation. Within a philosophy of ethical organising, mutuality permits an examination of the unavoidable relational nature of collective action, whereas meaningfulness addresses fundamental human concerns for significance and leading a life we have reason to value. By addressing our status as relational beings with human needs for meaning, a philosophy of ethical organising brings critical thinking to the creation of morally informed organisational practices which are not only instrumentally beneficial for addressing wicked problems, but are normatively desirable for human flourishing. (shrink)

Why should governments or individuals invest time and resources in conserving biodiversity? A popular answer is that biodiversity has both instrumental value for humans and intrinsic value in its own right. Defending Biodiversity critically evaluates familiar arguments for these claims and finds that, at best, they provide good reasons for conserving particular species or regions. However, they fail to provide a strong justification for conserving biodiversity per se. Hence, either environmentalists must develop more compelling arguments for conserving biodiversity or else (...) they should modify their agenda. This short precis is an overview of the central findings of our book. (shrink)

Exploitation locates what it is we recognize as bad when we judge a situation to be exploitative. Ideal for courses in social and political philosophy, public policy, or political science.

Heidegger argues that modern technology is quantifiably different from all earlier periods because of a shift in ethos from in situ craftwork to globalised production and storage at the behest of consumerism. He argues that this shift in technology has fundamentally shaped our epistemology, and it is almost impossible to comprehend anything outside the technological enframing of knowledge. The exception is when something breaks down, and the fault ‘shows up’ in fresh ways. Stiegler has several important addendums to Heidegger’s thesis. (...) Firstly, that Heidegger fails to fully appreciate the early Greek myth of Prometheus, and the technological depth that fire offers all human societies. Secondly, the fall, or failure, which is doubled in the myth of Prometheus, and shows up in epistemology accordingly. Thirdly the acceleration of technology since the onset of Information Technology, and the way this is disorientating our Being. I argue the fall in both Heidegger and early Stiegler has encaptured their imagination. In later work, Stiegler argues that acceleration is fused with algorithmic pretensions, that are distorting and undermining the creative political imaginary, and making it difficult to revalue the values that underpin the nihilist Anthropocene. The overcoming of the Anthropocene engages politics, economics, power, physics, and ecology. (shrink)

Robert Alexy develops his influential theory of legal reasoning exploring the nature of legal argumentation and its relation to practical reasoning. In doing so he sheds light on fundamental questions of law and rationality, which are as crucial to practising lawyers and law students as they are to scholars of legal theory.

What kind of affective phenomenon is religious zeal and how does it relate to other affective phenomena, such as moral anger, hatred, and love? In this paper, I argue that religious zeal can be both, and be presented and interpreted as both, a love-like passion and an anger-like emotion. As a passion, religious zeal consists of the loving devotion to a transcendent religious object or idea such as God. It is a relatively enduring attachment that is constitutive of who the (...) zealot is, and it expresses itself in a distinctive set of mental and behavioral dispositions. Most importantly, it motivates uncompromising actions and involves intense, hot, and deep emotions. As an anger-like emotion, religious zeal is an occurrent affective state of mind that is intentionally directed towards a specific object, characteristically a person or group of persons. It condemns the violation of a religious norm that is taken to be of absolute validity and general applicability. It motivates an action aiming at vengeance and retaliation, and it involves intense and hot feelings of hostility towards its object. I argue that rather than reducing the complex phenomenon of religious zeal to one of these two manifestations, we should reflect upon the question of how the two distinct conceptualizations relate to each other. (shrink)

In this article, I provide an analysis of the widespread, intellectually fascinating, and existentially challenging phenomenon of self-reflexive anxiety in which we feel threatened by what or who we are. I focus on those cases in which we take an event or action whose possible occurrence we attribute to ourselves to be expressive or constitutive of our identity. As I argue, depending on the kind of event we are dealing with, our descriptive self-conception, our self-esteem, or our evaluative self-conception are (...) at stake. In all cases, we are confronted with a dialectic between self and other, activity and passivity inherent in our personhood or even in our agency. I demonstrate how my analysis is not only of intrinsic value, but it can also help us in achieving a better understanding of self-reflexive emotions in general and ‘traditional’ self-reflexive emotions like shame in particular. (shrink)

Background In the UK, the solidaristic character of the NHS makes it one of the most trusted public institutions. In recent years, the introduction of data-driven technologies in healthcare has opened up the space for collaborations with private digital companies seeking access to patient data. However, these collaborations appear to challenge the public’s trust in the. Main text In this paper we explore how the opening of the healthcare sector to private digital companies challenges the existing social contract and the (...) NHS’s solidaristic character, and impacts on public trust. We start by critically discussing different examples of partnerships between the NHS and private companies that collect and use data. We then analyse the relationship between trust and solidarity, and investigate how this relationship changes in the context of digital companies entering the healthcare system. Finally, we show ways for the NHS to maintain public trust by putting in place a solidarity grounded partnership model with companies seeking to access patient data. Such a model would need to serve collective interests through, for example, securing preferential access to goods and services, providing health benefits, and monitoring data access. Conclusion A solidarity grounded partnership model will help establish a social contract or licence that responds to the public’s expectations and to principles of a solidaristic healthcare system. (shrink)

Three experiments are reported which show that in certain contexts subjects reject instances of the valid modus ponens and modus tollens inference form in conditional arguments. For example, when a conditional premise, such as: If she meets her friend then she will go to a play, is accompanied by a conditional containing an additional requirement: If she has enough money then she will go to a play, subjects reject the inference from the categorical premise: She meets her friend, to the (...) conclusion: She will go to a play. Other contexts suppress the conditional fallacies. The first experiment demonstrates the effects of context on conditional reasoning. The second experiment shows that the inference suppression disappears when the categorical premise refers to both of the antecedents, such as: She meets her friend and she has enough money. In this case, subjects make both the valid inferences and the fallacies, regardless of the contextual information. The third experiment establishes that when subjects are given general information about the duration of a situation in which a conditional inducement was uttered, such as: If you shout then I will shoot you, they reject both the valid inferences and the fallacies. The results suggest that the interpretation of premises plays an even more central role in reasoning than has previously been admitted. Trois expériences montrent que dans certains contextes les sujets rejettent des instances valides de modus ponens et de modus tollens dans des énoncés conditionnels. Par exemple, quand une prémisse conditionnelle comme: Si elle rencontre son ami, alors elle ira jouer, est accompagnée par une phrase contenant une condition supplémentaire: Si elle a assez d'argent, alors elle ira jouer, les sujets rejettent l'inférence liant la prémisse catégorielle: Elle rencontre son ami, à la conclusion: Elle ira jouer. D'autres contextes éliminent également les inférences conditionnelles fallacieuses. La premiére expérience démontre l'effet du contexte sur la raisonnement conditionnel. La deuxiéme expérience montre que la suppression de l'inférence disparait quand la prémisse catégorielle fait référence aux deux antécédants, comme: Elle rencontre son ami et elle a assez d'argent. Dans ce cas, les sujets font aussi bien les inférences valides et fallacieuses, quelle que soit l'information contextuelle. La troisiéme expérience établit que quand l'on donne aux sujets des informations générales à propos de la durée d'une situation dans laquelle une conditionnelle a été prononcée, comme Si tu cries, alors je te tire dessus, ils rejettent autant les inférences valides que les inférences fallacieuses. Ces résultats suggèrent que l'interprétation des prémisses joue un rŏle encore plus central dans le raisonnement que l'on admettait auparavant. (shrink)

The current rise of populism is often associated with affects. However, the exact relationship between populism and affects is unclear. This article addresses the question of what is distinctive about populist (appeals to) affects. It does so against the backdrop of a Laclauian conception of populism as a political logic that appeals to a morally laden frontier between two homogenous groups, ‘the people’ and ‘those in power’, in order to establish a new hegemonic order. I argue that it is distinctive (...) of populism that it breaks with the dominating feeling rules by overtly appealing to affects and reclaiming them for the realm of the political. The article explores three groups of affective phenomena: discontent, anger, and fear; empathetic, sympathetic, group-based, and shared emotions; and collective passions of enthusiasm and love. It shows how an appeal to these affects relates to the political logic of populism itself by contributing to the concretization, collectivization, and unification of affects. (shrink)

R.M. Hare’s two-level utilitarianism provides a useful framework for understanding the evolution of codes of professional ethics. From a Harean perspective, the codes reflect both the fact that members of various professions face special kinds of ethically charged situations in the normal course of their work, and the need for people in special roles to acquire various habits of thought and action. This highlights the role of virtue in professional ethics and provides guidance to professional societies when considering modifications to (...) their codes. From a Harean perspective, a professional society should ask both “Are there kinds of situations that members of this profession will normally encounter which members of other professions and/or the general public will not?” and “What habits of thought and action would it be good for individuals encountering such situations to have?”. (shrink)

In Children, Religion and the Ethics of Influence, John Tillson sets out a clear and convincing case for the view that children ought not to be initiated into religious faith by their parents or others with the relevant ‘extra-parental responsibilities’. However, by predicating his thesis on an understanding of illegitimate religious influence that largely equates initiation into faith with the inculcation of a distinctive type of propositional content, I contend that Tillson misses some of the potential harms such initiation may (...) engender. Here I briefly explain why this is a problem before suggesting three ways he might respond to the criticism. (shrink)

Those who conduct research on animals and those who advocate on behalf of animals have more in common than is generally supposed. A more nuanced understanding of the arguments defending animals' interests can help replace the current politics of confrontation with a genuine conversation.

This book provides a clear, simple account of techniques involved in assisted reproduction and embryo research. It thoughtfully and provocatively explores controversies raised by developments in reproductive technology since the first IVF baby in 1978, such as 'saviour siblings', designer babies, reproductive cloning and embryo research.