Our knowledge about the world is often expressed by generic sentences, yet their meanings are far from clear. This book provides answers to central problems concerning generics: what do they mean? Which factors affect their interpretation? How can one reason with generics? Cohen proposes that the meanings of generics are probability judgments, and shows how this view accounts for many of their puzzling properties, including lawlikeness. Generics are evaluated with respect to alternatives. Cohen argues that alternatives are induced by the (...) kind as well as by the predicated property, and thus provides a uniform account of the varied interpretations of generics. He studies the formal properties of alternatives and provides a compositional account of their derivation by focus and presupposition. Cohen uses his semantics of generics to provide a formal characterization of adequate default reasoning, and proves some desirable results of this formalism. (shrink)

Generics and frequency statements are puzzling phenomena: they are lawlike, yet contingent. They may be true even in the absence of any supporting instances, and extending the size of their domain does not change their truth conditions. Generics and frequency statements are parametric on time, but not on possible worlds; they cannot be applied to temporary generalizations, and yet are contingent. These constructions require a regular distribution of events along the time axis. Truth judgments of generics vary considerably across speakers, (...) whereas truth judgments of frequency statements are much more uniform. A generic may be false even if the vast majority of individuals in its domain satisfy the predicated property, whereas a frequency statement using, e.g., usually would be true. This paper argues that all these seemingly unrelated puzzles have a single underlying cause: generics and frequency statements express probability judgments, and these, in turn, are interpreted as statements of hypothetical relative frequency. (shrink)

It is widely agreed that generics tolerate exceptions. It turns out, however, that exceptions are tolerated only so long as they do not violate homogeneity: when the exceptions are not concentrated in a salient “chunk” of the domain of the generic. The criterion for salience of a chunk is cognitive: it is dependent on the way in which the domain is mentally represented. Findings of psychological experiments about the ways in which different domains are represented, and the actors affecting such (...) representations, account for judgments of generic sentences, facts which cannot be explained by linguistics alone. The reason for the homogeneity requirement itself is, in turn, also dependent on cognitive considerations. Generics express default rules, and psychological findings have shown that, the more homogeneous the domain, the easier it is for subjects to infer rules about it. Thus, cognitive results form a crucial part of a comprehensive account of the meaning of a linguistic expression. (shrink)

Le numérique réalise une opération d’alchimie, déclinée ici en cinq thèses : 1) L’original disparaît, la copie numérique devient originale, et l’œuvre trouve sa valeur par la création d’un contexte. 2) Dès lors que la position d’auteur est partagée avec le public, l’œuvre se juge en termes de relation. 3) Il devient impossible de mesurer la vérité d’une œuvre, sa valeur repose donc sur sa justesse. 4) L’œuvre ne tient plus sa valeur du musée ou de la galerie, mais des (...) espaces-temps qu’elle réussit à construire. 5) Les arts nés du numérique et des biotechnologies sont les labos in vivo d’autres valeurs que celle du marché de l’art. (shrink)

What ends should designers pursue? To what extent should they care about the societal and environmental impact of their work? And why should they care at all? Given the key influence design has on the way people live their lives, designing is fraught with ethical issues. Yet, unlike education or nursing, it lacks widespread professional principles for addressing these issues. -/- Rooted in a communitarian view of design practice, this lively and accessible book examines design through the lens of professions, (...) offering a critical vision that enables practitioners, academics and students of design in all disciplines to reflect on the practice’s overarching purposes. Considering how these are connected to others' flourishing and moulded by community interactions, "The Goods of Design" argues for a practice-based approach to cultivate professional ethics; it provides a normative direction that can meaningfully guide professional design activity, both individually and collectively. The volume also looks into the implications work has for the designer's self-growth as a person, offering ways to discover and navigate the complex tensions between personal and professional life. (shrink)

In this paper we show that focus structure determines the interpretation of bare plurals in English: topic bare plurals are interpreted generically, focused bare plurals are interpreted existentially. When bare plurals are topics they must be specific, i.e. they refer to kinds. After type-shifting they introduce variables which can be bound by the generic quantifier, yielding characterizing generics. Existentially interpreted bare plurals are not variables, but denote properties that are incorporated into the predicate.The type of predicate determines the interpretation of (...) its bare plural subject. The individual/stage-level distinction, though important, is not sufficient: since only arguments can be topics, only those stage-level predicates which have locative arguments can have existential bare plural subjects.Certain verbs (e.g., hate) fail to incorporate their bare plural objects; therefore no existential reading of the object is available. We provide a novel solution to this puzzle based on the following two claims: (i) incorporated bare plurals do not introduce discourse referents; (ii) nonincorporating verbs are presuppositional. (shrink)

Lecture audiences and students were asked to respond to virtual decision and game situations at gametheory.tau.ac.il. Several thousand observations were collected and the response time for each answer was recorded. There were significant differences in response time across responses. It is suggested that choices made instinctively, that is, on the basis of an emotional response, require less response time than choices that require the use of cognitive reasoning.

While opinions on the semantic analysis of generics vary widely, most scholars agree that generics have a quasi-universal flavor. However, there are cases where generics receive what appears to be an existentialinterpretation. For example, B's response is true, even though only theplatypus and the echidna lay eggs: (1) A: Birds lay eggs. B: Mammals lay eggs too. In this paper I propose a uniform account of the semantics of generics,which accounts for their quasi-existential readings as well as for their more (...) familiar quasi-universal ones. Generics are focus-sensitiveoperators: their domain is restricted by a set of alternatives, which may be provided by focus. I claim that, unlike otherfocus-sensitive operators, generics may, but do not have to, associate with focus. When alternatives are introduced, either by focus or by other means, generics get their usual quasi-universal readings. But when no alternatives are introduced, quasi-existential readings result.I argue that generics, unlike adverbs of quantification, do not introduce tripartite structures directly, but are initially interpreted as cases ofdirect kind predication. Only when this interpretation fails to make sense, the phonologically null generic quantifier is derived, and tripartite structures result. This two-level interpretation has the effect that while adverbs of quantification require focus to determine which elements go to the restrictor and which to the nuclear scope, and hence must associate with focus, generics do not, and hence may fail to associate with focus, resulting in quasi-existential readings. (shrink)

In addition to the familiar cardinal and proportional readings of many and few, there is yet another interpretation, the relative proportional reading. This reading, unlike the ordinary absolute proportional reading, is not conservative. Under the relative reading, 'Many ψs are φs' is true just in case the proportion of φs among ψs is greater than the proportion of φs among members of contextually given alternatives to ψ. I provide a definition of proportional readings that reduces the differences between absolute and (...) relative interpretations to the value of a single parameter.I argue that relative readings are not restricted to many and few, but are also exhibited by the adverbs often and seldom, and by generics. Interpretations of determiners that have been treated as "focus-affected readings," interpretations of adverbs of quantification that have been treated as "pure frequency readings," and interpretations of generics which have been claimed to be cases of "reverse interpretation" or "direct kind predication" are, in fact, instances of relative readings.A: Army reserve service is especially hard on people who own a small business.Q: Do many small-business owners serve in your regiment?A: I don't know what it's like in other regiments –Q: I am not asking you about other regiments.A: I know, but relatively speaking . . .(Interview on Israel Army Radio, June 8th, 2001). (shrink)

In the late 1940s and early 1950s, the leaders of the Genetics Society of America struggled to find an appropriate group response to Trofim Lysenko’s scientific claims and the Soviet treatment of geneticists. Although some of the leaders of the GSA favored a swift, critical response, procedural and ideological obstacles prevented them from following this path. Concerned about establishing scientific orthodoxy on one hand and politicizing the content of their science on the other, these American geneticists drew on democratic language (...) and concepts as they engaged in this political issue. The relatively weak statements that did emerge from the GSA attracted little attention in the scientific or popular press. The intensely politicized atmosphere of American science complicated the GSA’s task, as domestic concerns about protecting democracy were beginning to constrain academic freedom. In the context of American Cold War culture, Lysenko became just one example of the dangers the Cold War world presented to scientific freedom. (shrink)

In analyzing evidence indicating that K'ung-ts'ung-tzu was a forgery, Yoav Ariel questions current views of the Confucian school in the time between the Sage's death in the fifth century B.C. and the emergence in the eleventh century of Neo-Confucianism. The text, traditionally ascribed to a descendant of Confucius, K'ung Fu, provides a setting for a series of philosophical debates between K'ung family members and representatives of such non-Confucian schools as Legalism, Mohism, and the School of Names. However, finding that this (...) text was probably fabricated by the controversial Confucian master, Wang Su, Ariel explains how it sheds light on the third-century philosophical milieu: Confucianism then is seen to have been not only Taoistically metaphysical, individualistic, and escapist, but also aggressive in advocating early Confucian values. The first part of Ariel's book deals with the general characteristics, history, dating, authenticity, and authorship of the text. The second part is a fully annotated and analyzed translation of the first of the two traditional volumes that constitute the K'ung-ts'ung-tzu. Originally published in 1989. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905. (shrink)

The adequacy of Elliott Sober’s analogy between classical mechanics and evolutionary theory—according to which both theories explain via a zero-force law and a set of forces that alter the zero-force state—has been criticized from various points of view. I focus here on McShea and Brandon’s claim that drift shouldn’t be considered a force because it is not directional. I argue that there are a number of different theses that could be meant by this, and show that one of those theses—the (...) idea that drift cannot bias populations to be taken somewhere in the evolutionary space from one generation to the next—is actually false. Not only has this thesis been implicitly assumed in the discussion of the force analogy thus far, but it is also commonly found in a wider range of philosophical and biological texts. I argue that correcting this view, and the usual images associated with it, will thereby bring heuristic benefits that impact the force analogy discussion, but that also go beyond it. (shrink)

p. cm. — (Zeuthen lecture book series) Includes bibliographical references (p. ) and index. ISBN 0-262-18187-8 (hardcover : alk. paper). — ISBN 0-262-68100-5 (pbk. : alk. paper) 1. Decision-making. 2. Economic man. 3. Game theory. 4. Rational expectations (Economic theory) I. Title. II. Series.

The objective of the consistent-amplitude approach to quantum theory has been to justify the mathematical formalism on the basis of three main assumptions: the first defines the subject matter, the second introduces amplitudes as the tools for quantitative reasoning, and the third is an interpretative rule that provides the link to the prediction of experimental outcomes. In this work we introduce a natural and compelling fourth assumption: if there is no reason to prefer one region of the configuration space over (...) another, then they should be “weighted” equally. This is the last ingredient necessary to introduce a unique inner product in the linear space of wave functions. Thus, a form of the principle of insufficient reason is implicit in the Hilbert inner product. Armed with the inner product we obtain two results. First, we elaborate on an earlier proof of the Born probability rule. The implicit appeal to insufficient reason shows that quantum probabilities are not more objective than classical probabilities. Previously we had argued that the consistent manipulation of amplitudes leads to a linear time evolution; our second result is that time evolution must also be unitary. The argument is straightforward and hinges on the conservation of entropy. The only subtlety consists of defining the correct entropy; it is the array entropy, not von Neumann's. After unitary evolution has been established we proceed to introduce the useful notion of observables and we explore how von Neumann's entropy can be linked to Shannon's information theory. Finally, we discuss how various connections among the postulates of quantum theory are made explicit within this approach. (shrink)

El artículo revisa -tomando como referencia el episodio de un bloqueo de vías en Argentina durante siete días con sus noches, por parte de los habitantes de las localidades de Cutralco y Plaza Huincul, Argentina, con motivo de la privatización de YPF- el debate sobre la desobediencia civil, que es usualmente entendida como una desobediencia por la fuerza al orden constitucional. El autor desarrolla los componentes que la desobediencia civil tiene de específico, a saber: es disruptiva, pacífica, autónoma y recursiva; (...) esto último porque debe vincularse internamente con el mismo tipo de reglas que le reclama al sistema. Ello, dice, la convierte en una práctica excepcional, pero ello no implica que se incurra en una idealización. Plantea luego que, en lugar de encapsular a la desobediencia civil dentro de los moldes del liberalismo, buscando el menor costo posible para el Estado de derecho, y convertirla en inofensiva para que sea legítima, habría que redefinirla a partir de los ideales procedimentales que presuponemos en cualquier práctica social. (shrink)

RESUMEN La concepción antropológica desplegada en los Manuscritos del '44 puede verse como una constante en toda la obra de Marx, siendo de especial importancia para trazar una lectura ética de nociones políticas fundamentales como las de emancipación social, tiempo libre o comunismo. En función de esto se desarrollan los conceptos de ser genérico y ser social con el objetivo de establecer los rasgos principales de la ontologia marxiana y, desde allí, identificar los principales elementos filosóficos que harían a la (...) perspectiva critica del propio Marx y su proyecto emancipatorio. ABSTRACT The anthropological conception deployed in the Manuscripts of 1944 can be seen as a constant throughout Marx's work, and is of particular importance for drawing an ethical reading of fundamental political notions such as social emancipation, free time or communism. On this basis, the concepts of generic and social being are developed in order to establish the main features of the Marxian ontology and to identify the main philosophical elements that would found the critical perspective of Marx and his emancipatory project. (shrink)

Le super héros est un minable comme les autres, et ce sont les humains les plus ordinaires qui leur servent désormais de modèle. Des Watchmen à The Boys en passant par Le Maître du haut château et les derniers avatars de Star Trek, c’est grâce à leurs antihéros à la Philip K. Dick que bien des séries contemporaines interrogent nos valeurs, voire dynamitent avec un sourire parfois corrosif les dernières forteresses de la société bourgeoise et patriarcale.

In this paper, the term ‘debate’ refers to a situation in which two parties disagree over some issue and each of them tries to persuade a third party, the listener, to adopt his position by raising arguments in his favor. We are interested in the logic behind the relative strength of the arguments and counterarguments; we therefore limit our discussion to debates in which one side is asked to argue first, with the other party having the right to respond before (...) the listener makes up his mind. (shrink)

The paper presents a simple game-theoretic model in which players decide on search procedures for a prize located in one of a set of labeled boxes. The prize is awarded to the player who finds it first. A player can decide on the number of (costly) search units he employs and on the order in which he conducts the search. It is shown that in equilibrium, the players employ an equal number of search units and conduct a completely random search. (...) The paper demonstrates that the search procedure is intrinsically inefficient. Journal of Economic Literature Classification.. (shrink)

Forget the technology, and ask instead about the sampler’s gesture. For a long time, like Mozart’s « Don Giovanni », all citation supposed an instrument, an orchestra. Then, with the first recording technology, came the possibility of using tape recorders or analog turntables. But ultimately, the gesture is the same: overtly drawing upon a work .for its creation. In itself, the act of pillaging is not condemnable. Better, the détournement of advertising and of those artists like Michael Jackson who flood (...) our ears are indispensable acts of resistance and humour. Ariel Kyrou - the author of Techno Rebelle, Un Siècle de musiques électroniques , front which this « elegy to pillage » conies - prefers a scathing recycling to the recitals of the market, prefers the « loan » that one goes way beyond by rage and talent to the application of painless recipes for success. (shrink)

In spite of the burgeoning philosophical literature on human dignity, Stephen Darwall's second-personal account of the dignity of persons has not received the attention it deserves. This article investigates Darwall's account and argues that it faces a dilemma, for it succumbs either to a problem of antecedence or to the wrong kind of reasons problem. But this need not mean one should reject a second-personal account. Instead, I argue that an alternative second-personal conception, one I will call relational, promises to (...) solve the dilemma by avoiding both the problem of antecedence and the wrong kind of reasons problem. More generally, distinguishing these two second-personal conceptions of the dignity of persons is important to enrich the available philosophical accounts of human dignity. (shrink)

Agricultural reports and guides, nonhuman animal welfare studies, and animal rights reports attempt to document and convey the condition of nonhuman animals in agriculture. These disciplines tend to resist a prolonged and methodically versatile examination of individual animals. In his pioneer work, Lovenheim , The author produced such a biographical documentation of calves in the dairy and meat industries. He provided an exceptionally prolonged and detailed tracing of their lives as individuals, establishing an emotional attachment in both documenter and reader. (...) Yet, sentiments for the farmers, typical urban conceptions of communication with nonhuman animals, and difficulties in obtaining the relevant information limit Lovenheim's success and imply similar difficulties in other cases. (shrink)

Claiming rights against one another is a perfectly familiar phenomenon. We express the elementary thought you cannot do that to me in a variety of ways. And yet, in spite of the perfect familiarity of this phenomenon, the two standard philosophical theories of rights face notorious difficulties in accounting for it. My aim in this paper is to introduce a distinctive, second-personal account of rights. I will call this the independence theory of rights, the view that rights are specifications of (...) a basic right to independence against another. And I will argue that by taking as basic the second-personal thought you cannot do that to me the independence theory best illuminates the basic phenomenon of having rights against one another. (shrink)

'Et si les livres de sciences humaines avaient leur esthétique propre? Et si les idées des savants étaient tout simplement belles?' Établissant un pont entre art et savoir, performance artistique et performance intellectuelle, Ariel Colonomos trace les contours d'une esthétique de la connaissance qui renouvelle les critères distinctifs du beau. Il balaie ainsi deux idées fausses : l'esthétique relèverait de préoccupations futiles et la beauté compromettrait la qualité du savoir. Chaque auteur et chaque discipline ont une voix, une plume, et (...) la beauté de la forme repose notamment sur la force d'une intrigue, la capacité d'un texte ou d'un discours à surprendre son public. Si la beauté est clarté, elle a aussi une part de mystère. Sur cette ligne de crête, les théories des sciences humaines font autant réfléchir que rêver. Dans la mesure où elle permet aux idées de se diffuser et d'être reconnues, l'esthétique du savoir prend une valeur communicationnelle et une portée universelle. Pour le démontrer, Ariel Colonomos entreprend un voyage ludique, mais toujours savant, à travers différents univers et disciplines - sciences, histoire, phénoménologie, anthropologie, sociologie, philosophie, éthique... -, de l'Antiquité à nos jours"--Page 4 of cover. (shrink)

Both traditional accounts of hope and some of their recent critics analyze hope exclusively in terms of attitudes that a hoper bears towards a hoped-for prospect, such as desire and probability assignment. I argue that all of these accounts misidentify cases of despair as cases of hope, and so misconstrue the nature of hope. I show that a more satisfactory view is arrived at by noticing that in addition to the aforementioned attitudes, hope involves a characteristic attitude towards an external (...) factor, on whose operation the hoper takes the prospect's realization to depend causally. (shrink)

What if claims about the future informed us about the intentions and the capabilities of our opponents to wage war against ourselves? Would and should the existing norms that restrict the preventive use of force change in the wake of such transformation? This article highlights the potential normative consequences of this change and discriminates between several possible normative evolutions. Would and should the “knowability of the future” alter radically the traditional rule of self-defense? This rule could indeed be jeopardized but, (...) as I argue in this paper, it should not. However, the distinction between preemption and prevention could become obsolete. Future claims about security will also induce new security doctrines as knowledge about the future would be used to signal one’s intentions and deter one’s opponent. This change would also have a significant impact on accountability, as citizens would have a more active role in discussions over foreign policy. Moreover, new modes of predictions and forecasting will challenge the traditional role of experts whose biases have hampered their analyses and anticipations. Thus, trustworthy future claims could bring significant progress in both ethical and political terms as they would trigger a debate on the role of knowledge in democratic societies. (shrink)

RESUMO Busco traçar uma articulação teórica em torno de duas obras póstumas de Mikhail Bakhtin e Yuri Lotman, expoentes chave para pensar a cultura sob uma perspectiva semiótica. Nessas produções tardias, os dois pensadores expõem um interesse compartilhado em refletir como o medo se materializa, podendo-se ler em textos concretos que buscam explicar os fenômenos que estão ocorrendo no horizonte cultural. Nesse sentido, Lotman e Bakhtin estão focados em investigar a aparência regular de um conjunto de princípios e motivos que (...) seriam sistematicamente atualizados na relação entre laços sociais e medo. Meu objetivo vai além do descritivo para delinear aparatos críticos sobre o medo na perspectiva semiótica, à luz da interpretação desses artigos que mantêm o poder heurístico e fornecem um instrumento para iniciar uma reflexão sobre esse modo cultural de sentimento.ABSTRACT I seek to draw a theoretical articulation around two posthumous works by Mikhail Bakhtin and Yuri Lotman, key exponents to think about culture from a semiotic perspective. In these late productions, both thinkers expose a shared interest in reflecting how fear materializes, being able to be read in concrete texts that seek to account for the phenomena that are occurring on the cultural horizon. In this sense, Lotman and Bakhtin focus on investigating the regular appearance of a set of principles and motives that would be systematically updated in the relationship between social ties and fear. My purpose is not only to describe, but also to outline a critical apparatus about fear from a semiotic perspective, in light of the interpretation of these articles that keep heuristic power and provide an instrument to initiate a reflection on this cultural mode of feeling.RESUMEN Busco trazar una articulación teórica en torno a dos trabajos póstumos de Mikhail Bakhtin y Yuri Lotman, exponentes clave para pensar la cultura desde una perspectiva semiótica. En estas producciones tardías, ambos pensadores exponen un interés compartido por reflexionar de qué manera el miedo se materializa, pudiendo leerse en textos concretos que buscan dar cuenta de los fenómenos que van produciéndose en el horizonte cultural. En tal sentido, Lotman y Bakhtin se abocan a indagar sobre la aparición regular de un conjunto de principios y motivos que se actualizarían, sistemáticamente, en la relación entre lazo social y miedo. Mi propósito irá más allá de lo descriptivo para esbozar aparato crítico sobre el miedo en perspectiva semiótica, a la luz de la interpretación de estos artículos que guardan potencia heurística y proveen de un instrumental para iniciar una reflexión sobre este modo cultural del sentir. (shrink)

We model differences among agents in their ability to recognize temporal patterns of prices. Using the concept of DeBruijn sequences in two dynamic models of markets, we demonstrate the existence of equilibria in which prices fluctuate in a pattern that is independent of the fundamentals and that can be recognized only by the more competent agents. (JEL: C7, D4.

Let me start with what you should not do. Do not attend too many seminars in your own field. Otherwise you may simply end up adding a comment to the existing literature, which is mostly made up of comments on previous comments which were themselves only marginal comments. If you want a good idea, look at the world around you or take courses in other disciplines. Some of the papers in my own dissertation (like my 1979 paper on a principal-agent (...) problem with moral hazard and an infinite horizon) were thought of while daydreaming in some law courses I took. (shrink)

Arising out of the author's lifetime fascination with the links between the formal language of mathematical models and natural language, this short book comprises five essays investigating both the economics of language and the language of economics. Ariel Rubinstein touches the structure imposed on binary relations in daily language, the evolutionary development of the meaning of words, game-theoretical considerations of pragmatics, the language of economic agents and the rhetoric of game theory. These short essays are full of challenging ideas for (...) social scientists that should help to encourage a fundamental rethinking of many of the underlying assumptions in economic theory and game theory. As a postscript two economists, Tilman Borgers and Bart Lipman, and a logician, Johan van Benthem offer comments. (shrink)

Resumert Este trabajo presenta varios modelos que destacan el contraste entre las teorias de la decision y de los juegos, por una parte, y la intuicidn y los datos empiricos y experimentales, por otra. Estos ejemplos estimulan la adopcion del punto de vista de la ra-.

Introduction Introducing Accessibility theory 0.1 On the role of context Utterances cannot be processed and interpreted on their own. ...

Generics are sentences such as Birds fly, which express generalizations. They are prevalent in speech, and as far as is known, no human language lacks generics. Yet, it is very far from clear what they mean. After all, not all birds fly—penguins don’t! -/- There are two general views about the meaning of generics in the literature, and each view encompasses many specific theories. According to the inductivist view, a generic states that a sufficient number of individuals satisfy a certain (...) property—in the example above, it says that sufficiently many birds fly. This view faces the complicated problem of spelling out exactly how many is “sufficiently many” in a way that correctly captures the intuitive truth conditions of generics. -/- An alternative, the rules and regulations view, despairs from this project and proposes instead that generics directly express rules in the world. Rules are taken to be abstract objects, which are not related to the properties of specific individuals. This view faces the difficult problem of explaining how people come to know of such rules when judging the truth of falsity of generics, and accounting for the strong intuition that a sentence such as Birds fly talks about birds, not abstract objects. -/- What seems to be beyond dispute is that generics, even if they do not express rules, are lawlike: they state non-accidental generalizations. Many scholars have taken this fact to indicate that generics are parametric on possible worlds: they refer to worlds other than the actual world. This, again, raises the problem of how people come to know about what happens in these other worlds. However, a rigorous application of standard tests for intensionality shows that generics are not, in fact, parametric on possible worlds, but only on time. This unusual property may explain much of the mystery surrounding generics. -/- Another mysterious property of generics is that although there is no language without them, there is no linguistic construction that is devoted to the expression of genericity. Rather, generics can be expressed in a variety of ways, each of which can also express nongenerics. Yet, each manifestation of generics differs subtly (or sometimes not so subtly) in its meaning from the others. -/- Even when these and other puzzles of genericity are solved, one mystery would remain: Why are generics, which are so easy to produce and understand in conversation, so difficult to analyze? (shrink)