Stem Cell Dialogues: A Philosophical and Scientific Inquiry Into Medical Frontiers
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"Stem cells" have become linked with both new frontiers in medical science and political and ethical controversy. The field, along with the emerging area of regenerative medicine, is creating the conditions for a time when damaged tissue and organs might be repaired through personalized cell therapy as easily as the body repairs itself, therefore revolutionizing the treatment of numerous diseases. Yet to obtain human embryonic stem cells, scientists must destroy human embryos -- a prospect that has provoked intense reactions among the American public. Addressing the moral and ethical issues of stem cell research while also educating readers about the biological function and medical applications of these cells, this book features fictional characters engaging in compelling inquiry and debate. Participants investigate the scientific, political, and socio-ethical dimensions of stem cell science using actual language, analysis, and arguments taken from scientific, philosophical, and popular literature. Each dialogue centers on a specific, recognizable topic, such as the policies implemented by the George W. Bush administration restricting the use of embryonic stem cells; the potential role of stem cells in personalized medicine; the ethics of cloning; and the sale of eggs and embryos. Additionally, speakers debate the use of stem cells to treat paralysis, diabetes, stroke effects, macular degeneration, and cancer. Educational, entertaining, and rigorously researched (with 300 references to scientific literature), Stem Cell Dialogues should be included in any effort to help the public understand the science, ethics, and policy concerns of this promising field.
Sheldon Krimsky
Sheldon Krimsky is the Carol Zicklin Visiting Professor of Philosophy at Brooklyn College, the Lenore Stern Professor of Humanities and Social Sciences at Tufts University, and adjunct professor in the Department of Public Health and Community Medicine at the School of Medicine at Tufts University. He lives in New York City and Cambridge, Massachusetts.
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Stem Cell Dialogues - Sheldon Krimsky
STEM CELL DIALOGUES
SHELDON KRIMSKY
STEM CELL DIALOGUES
A Philosophical and Scientific Inquiry Into Medical Frontiers
COLUMBIA UNIVERSITY PRESS
NEW YORK
Columbia University Press
Publishers Since 1893
New York Chichester, West Sussex
cup.columbia.edu
Copyright © 2015 Sheldon Krimsky
All rights reserved
E-ISBN 978-0-231-53940-1
Library of Congress Cataloging-in-Publication Data
Krimsky, Sheldon.
Stem cell dialogues : a philosophical and scientific inquiry into medical frontiers / Sheldon Krimsky.
pages cm
Includes bibliographical references and index.
ISBN 978-0-231-16748-2 (cloth : alk. paper) — ISBN 978-0-231-16749-9 (pbk. : alk. paper) — ISBN 978-0-231-53940-1 (electronic)
1. Embryonic stem cells—Research—Moral and ethical aspects. 2. Genetics—Moral and ethical aspects. 3. Medical genetics—Moral and ethical aspects. 4. Bioethics. I. Title.
QH588.S83K75 2015
174.2'8—dc23
2014039574
A Columbia University Press E-book.
CUP would be pleased to hear about your reading experience with this e-book at [email protected].
COVER DESIGN: Faceout Studio/Charles Brock
COVER IMAGE: © Getty
References to websites (URLs) were accurate at the time of writing. Neither the author nor Columbia University Press is responsible for URLs that may have expired or changed since the manuscript was prepared.
For my wife, Carolyn Boriss-Krimsky, whose playwriting sparked my interest in using dialogues in this book.
CONTENTS
Annotated Table of Contents
Acknowledgments
Introduction
Harnessing Stem Cells for Regenerative Medicine
DIALOGUE 1. HOPE
DIALOGUE 2. WHY IS THIS CELL DIFFERENT FROM OTHER CELLS?
DIALOGUE 3. THE PRESIDENT’S STEM CELLS
DIALOGUE 4. THE DICKEY-WICKER ENIGMA
DIALOGUE 5. THE MORAL STATUS OF EMBRYOS
DIALOGUE 6. CREATING GOOD FROM IMMORAL ACTS
DIALOGUE 7. CIRCUMVENTING EMBRYOCIDE
DIALOGUE 8. MY PERSONALIZED BETA CELLS FOR DIABETES
DIALOGUE 9. REPAIRING BRAIN CELLS IN STROKE VICTIMS
DIALOGUE 10. REVERSING MACULAR DEGENERATION
DIALOGUE 11. MY STEM CELLS, MY CANCER
DIALOGUE 12. REPROGRAMMING CELLS
DIALOGUE 13. MY PERSONALIZED DISEASE CELLS
DIALOGUE 14. TO CLONE OR NOT TO CLONE: THAT IS THE QUESTION
DIALOGUE 15. PATENTING HUMAN EMBRYONIC STEM CELLS IS IMMORAL AND ILLEGAL (IN EUROPE)
DIALOGUE 16. MY EMBRYO IS AUCTIONED ON THE INTERNET
DIALOGUE 17. HERE COMES THE EGG MAN: OOCYTES & EMBRYOS.ORG
DIALOGUE 18. HUMAN-ANIMAL CHIMERAS AND HYBRIDS
DIALOGUE 19. STEM CELL TOURISM
DIALOGUE 20. SOCIAL MEDIA MEET SCIENCE HYPE
DIALOGUE 21. FEMINISM AND THE COMMERCIALIZATION OF HUMAN EGGS/EMBRYOS
DIALOGUE 22. WAS MY BIRTH EMBRYO ME?
DIALOGUE 23. EMBRYOS WITHOUT OVARIES
DIALOGUE 24. HOW MY CELLS BECAME DRUGS
DIALOGUE 25. A CLINICAL TRIAL FOR PARALYSIS TREATMENT
EPILOGUE
Notes
Glossary
Index
ANNOTATED TABLE OF CONTENTS
DIALOGUE 1. HOPE
Sitting in a park on an April afternoon, Samuel Franklin, a sixty-six-year-old retired contractor, and his daughter Rebecca, a physician and Ph.D. medical geneticist, are enjoying a conversation. Samuel is in a wheelchair and tethered to a breathing machine. Classified as a quadriplegic, he has partial movement in the fingers of one hand, enough to move a computer mouse. Rebecca is sitting next to him, on a bench.
DIALOGUE 2. WHY IS THIS CELL DIFFERENT FROM OTHER CELLS?
Charles Walker is a stem cell biologist, one of the nation’s pioneers in isolating, activating, and delivering embryonic stem cells to tissues in rodents. After receiving her master’s degree in bioethics and before she started her own career in stem cell research, Dr. Rebecca Franklin interviewed Dr. Walker in his laboratory for an article she was planning to write for a general audience, like her father.
DIALOGUE 3. THE PRESIDENT’S STEM CELLS
The White House. Bernard Stein, M.D., is an ethics advisor to President George W. Bush, head of a national bioethics advisory panel, and a leading scholar on reproductive ethics. Dr. Franklin obtained an appointment with Dr. Stein to discuss President Bush’s policies on human embryonic stem cells.
DIALOGUE 4. THE DICKEY-WICKER ENIGMA
Arguments are heard before the three-judge panel of the U.S. Court of Appeals for the District of Columbia regarding Sherley v. Sebelius—a challenge to the executive order by President Barack Obama allowing federal funds to be used for human embryonic stem cell research, as long as it involves embryos that were created for reproductive purposes and are no longer needed for those purposes.
DIALOGUE 5. THE MORAL STATUS OF EMBRYOS
A panel discussion with Rabbi Jacob Goldman, Monsignor Patrick Callahan, and Mary Osborn on the moral status of early embryos. Osborn is a secular humanist and author of the acclaimed book Ethics Without God. Dr. Franklin acts as moderator.
DIALOGUE 6. CREATING GOOD FROM IMMORAL ACTS
Dr. Franklin flies to Germany to discuss the politics and ethics of stem cells with scientist Gordon Baum. Franklin is interested in how German scientists view their responsibility to the law and ethical norms while they investigate the medical benefits of human embryonic stem cells. She wants to understand why Germany does not permit scientists to destroy embryos in order to derive stem cells.
DIALOGUE 7. CIRCUMVENTING EMBRYOCIDE
Catholic bioethicist Paul Flannery and Dr. Franklin discuss the alternatives to destroying embryos in order to acquire pluripotent stem cells. Flannery has been advocating against the use of live embryos. Franklin challenges his view and proposes keeping all research opportunities open to scientists, a policy she refers to as stem cell pluralism.
DIALOGUE 8. MY PERSONALIZED BETA CELLS FOR DIABETES
Beverly Simpson has been living with type 1 diabetes her entire life. Her endocrinologist, Janet Richfield, is a stem cell scientist working on producing islet cells that can be transplanted to diabetics like Simpson to cure their insulin deficiency. Dr. Richfield discusses with Ms. Simpson the progress in clinical trials involving personalized embryonic stem cells that eventually could lead to a cure for her diabetes.
DIALOGUE 9. REPAIRING BRAIN CELLS IN STROKE VICTIMS
Dr. Franklin interviews a vascular surgeon and specialist in stroke victims, Leonard Hendricks, from the United Kingdom. He is a consultant to the UK company ReNeuron, which has pioneered developing stem cell therapeutics for stroke victims. Dr. Franklin is trying to understand the relationship between stem cell development for stroke victims and spinal cord injury. Because she does not engage in clinical work, she hopes to learn about the challenges of translational medicine in moving from research to clinical applications.
DIALOGUE 10. REVERSING MACULAR DEGENERATION
Ben Townsend is a stem cell scientist working with a team of ophthalmologists who has spent the last nine years trying to develop stem cells for the treatment of macular degeneration. His mother, Barbara Townsend, is a professor emeritus in the history of medicine at the University of Pennsylvania. She is in the early stages of macular degeneration and is preparing an article on stem cell therapy to treat the disease. She is also looking into entering a clinical trial and discusses it with her son and their friend Dr. Franklin.
DIALOGUE 11. MY STEM CELLS, MY CANCER
Genetic oncologist Dr. Arthur Cosgrove is trying to convince Senator Brad Furst, a senior member and chairman of the oversight subcommittee of the National Cancer Institute, to add a rider to the new NIH budget that dedicates $500 million for research on cancer stem cells, which Cosgrove believes will revolutionize treatments for cancer. The Senate hearing where Dr. Cosgrove has been called to testify is focused on the new budget. Dr. Franklin, seeking to find a cure for her father’s paralysis, has also been invited to testify.
DIALOGUE 12. REPROGRAMMING CELLS
Dr. Frederick Jones is a stem cell biologist who has invested considerable time reprogramming somatic cells to make them into embryonic stem cell-like cells (pluripotency). Dr. Franklin questions him about reversing the development of a differentiated cell—playing the role of skeptic about the prospects of cell reprogramming for producing therapeutic stem cells. She draws on her knowledge of epigenetics and cellular biology.
DIALOGUE 13. MY PERSONALIZED DISEASE CELLS
Dr. Leonard Phillips is a pediatric cardiologist who is treating a young child with an unusual arrhythmia. Dan Henderson is a cell biologist whose research centers on cardiac electrolyte abnormalities, one of the causes of arrhythmia. Henderson has embraced using stem cells as a revolutionary approach to evaluating drug therapies for electrolyte abnormalities that have a genetic etiology. Will stem cells reveal the etiology of the arrhythmia and open up a new therapeutic option?
DIALOGUE 14. TO CLONE OR NOT TO CLONE: THAT IS THE QUESTION
Dr. Howard Chadwick is director of the National Center for Stem Cells within the (fictional) National Institutes of Health. The purpose of the center is to help integrate regenerative medicine into the work of all the institutes. Dr. Chadwick is between a rock and a hard place with regard to embryonic stem cells: he recognizes their potential in science as well as the political firestorm they have produced. He calls upon Dr. Franklin to help him navigate through this ethical minefield.
DIALOGUE 15. PATENTING HUMAN EMBRYONIC STEM CELLS IS IMMORAL AND ILLEGAL (IN EUROPE)
Dr. Franklin moderates a panel discussion held at the Royal Society headquarters in London, about the Court of Justice of the European Union’s decision that patenting embryonic stem cells is unethical and therefore illegal. Other members of the panel are Hans Weninger, a scientist at the University of Bonn whose colleague filed a patent on turning human embryonic stem cells into neural cells to treat neurological defects; Bettina Andrews, a lawyer and legal scholar specializing in the European Union; and Jacques Penoir, a consultant to Greenpeace International, plaintiff in the lawsuit.
DIALOGUE 16. MY EMBRYO IS AUCTIONED ON THE INTERNET
Janet Blackman is a lawyer and feminist writer. After bearing her first child, she had difficulty conceiving again. In vitro fertilization (IVF) was not successful. Then she learned that her father had ALS. She had her son genetically tested and found that he too had the mutation. Realizing that her stored embryos had a rare disease gene, Janet decided to auction them off to researchers on EggAuction.com. Dr. Franklin contacted Ms. Andrews about the lawsuit filed against her by a right-to-life group.
DIALOGUE 17. HERE COMES THE EGG MAN: OOCYTES & EMBRYOS.ORG
Viktor Markovsky is a recent Russian immigrant who dreams of making a great deal of money in the American capitalist system, as a distributor for oocytes that people who have undergone IVF procedures no longer want. His company, Embryos & Oocytes.org, is preparing to go international and aims to be the largest single provider of oocyte sources for embryonic stem cells. He is in discussion with Arthur Worthington III, a venture capitalist who has invested lucratively in biotechnology and has made billions in BioVenture Associates. He brought Dr. Franklin along to help him understand the technical parts of the business plan.
DIALOGUE 18. HUMAN-ANIMAL CHIMERAS AND HYBRIDS
Developmental stem cell biologist Hector Lamont has engaged in pathbreaking research on producing neural cells from stem cells and studying their function in the brains of animals. Sarah Tessman is a physical anthropologist and president of a nonprofit organization opposed to the creation of mammalian interspecies genetic hybrids with the acronym SHACH—Stop Human-Animal Chimeras and Hybrids. Dr. Franklin moderates their discussion at a public symposium.
DIALOGUE 19. STEM CELL TOURISM
An open exchange of two opposing views at the meeting of the International Stem Cell Organization. Dr. Robert Flossel is a stem cell scientist who works at a private nonprofit company and a self-avowed libertarian who advocates getting government off the backs of scientists and out of the business of regulating clinical trials. Dr. Barbara Grant has written a book arguing that there are insufficient ethical standards for clinical trials in Third World nations and wants Western nations to refuse data from trials that do not meet minimum standards. Dr. Franklin moderates the panel.
DIALOGUE 20. SOCIAL MEDIA MEET SCIENCE HYPE
Medical anthropologist Ann Cummings of the University of New South Wales discusses the role of hype
in science with stem cell biologist Bretton Salisbury of Duke University, who does research on and has a small startup company that will be developing therapeutic uses of stem cells. Dr. Franklin, who has consulted for the company on their project to develop stem cells for spinal cord injuries, participates in the conversation.
DIALOGUE 21. FEMINISM AND THE COMMERCIALIZATION OF HUMAN EGGS/EMBRYOS
Dr. Franklin considers herself a second-wave feminist. Her grandmother, Sophie Franklin, was a suffragette in the early twentieth century and started a national women’s organization. Dr. Franklin has always supported a woman’s right to an abortion. Jenny Gunderson is a twenty-five-year-old activist with a women’s health group that is devoted to protecting women from eggsploitation,
or the commercialization of their eggs, and its impact on women’s health. The two feminists engage in a heated discussion about the status of embryos.
DIALOGUE 22. WAS MY BIRTH EMBRYO ME?
Neuropsychologist Jacob Spencer discusses the concept of human identity with French philosopher-phenomenologist and metaphysician Antoinette Picard. The issue is when human identity emerges in development and whether human identity encompasses the one-celled embryo from which a person develops. Dr. Franklin spent a semester in Paris studying with Dr. Picard and was invited to the discussion in the office of Dr. Spencer at New York University.
DIALOGUE 23. EMBRYOS WITHOUT OVARIES
Francis Donaldson is a stem cell scientist who reprogrammed a mouse skin cell into an embryonic-like stem cell and from it made fully functioning sperm and egg cells. His goal is to use the same technique for producing human gametes from adult cells. Laura Murphy is a Catholic-educated Ph.D. bioethicist who specializes in reproductive ethics and recently published a book titled Embryonic Tyranny: How Science Ignores the Sanctity of Life. Both were invited to appear in the 92nd Street Y lecture series—a popular venue for New Yorkers. The moderator of the event is Dr. Franklin.
DIALOGUE 24. HOW MY CELLS BECAME DRUGS
According to the Food and Drug Administration (FDA), treatments involving stem cells are drugs and biological products, which must comply with its regulatory requirements, including pre-market approval. Regenerative Sciences argued that their procedure represents medical practice and lies outside of FDA’s jurisdiction. The FDA has warned Regenerative Sciences that its use of stem cell treatments constitutes unlicensed biologics and violates the federal Food, Drug, and Cosmetic Act. The FDA brought suit in the U.S. District Court for the District of Columbia (United States v. Regenerative Sciences LLC).
DIALOGUE 25. A CLINICAL TRIAL FOR PARALYSIS TREATMENT
The Geron Corporation of Menlo Park, California, was the first company in the United States to have an investigative new drug (IND) involving stem cells, named GRNOPC1, approved for a clinical trial on patients with acute spinal cord injury. Fred Lincoln is a medical doctor working for Geron and overseeing the trial. Dr. Franklin has been a short-term consultant to Geron because of her work on stem cells for repairing her father’s spinal cord injury. Valerie Legere is a science reporter interviewing Dr. Lincoln about the risks and benefits of the trial, questioning whether there is enough proven science to justify a test on humans.
EPILOGUE
ACKNOWLEDGMENTS
Iwish to thank the following people who provided valuable advice and consultation at different stages of the book’s development: Carlos Sonnenschein, Lee Silver, Stuart Newman, Shirley Shalev, Stuart Waldman, and especially Jonathan Garlick, who invited me to co-teach courses with him on science and social issues, where I was introduced to stem cells. I am indebted to Patrick Fitzgerald of Columbia University Press for his support and guidance throughout the development of this book, and to Leslie Kriesel for her superb copyediting.
INTRODUCTION
The term stem cell,
first introduced in the backwaters of cell and developmental biology nearly 150 years ago, has recently become a central organizing concept in a rapidly growing field of biomedical science. And because of their association with the human embryo, stem cells have also entered the lexicon of popular culture in a maelstrom of controversy. They have come to signify a new frontier called regenerative medicine.
Stem cells are understood as the master building blocks and regenerating cells of an organism, starting in the fertilized egg and continuing in some form throughout development. Scientists have predicted that once stem cells can be isolated, cultured, and decoded so they can be differentiated into specialized cells, damaged brain, nerve, and heart cells can be repaired just as the body repairs itself when you cut your finger. Through a series of dramatic dialogues involving fictitious characters, this book explores the scientific, social, and ethical dimensions of stem cell science—one of the most dynamic and promising research programs in modern biology.
The history of biomedical science is punctuated by Nobel Prize-worthy discoveries that have had transformative, multidisciplinary effects on scientific research communities. In 1953 the major discovery was the structure of the DNA molecule by James Watson and Francis Crick. Twenty years later it was Stanley Cohen and Herbert Boyer’s pathbreaking work on a new technique called recombinant DNA molecule technology, by which they were able to transfer functioning genes from one organism to another, even across species.¹ In 1975 Frederick Sanger and Alan Coulson discovered a rapid method for determining sequences in DNA.² This led to the sequencing of the human genome twenty-five years later and created both a scientific and a commercial tidal wave of activity in genomics, bringing thousands of scientists into this work. By 1983, Kary Mullis discovered the polymerase chain reaction (PCR), an innovative new chemical technique used to rapidly copy a single strand (or a few strands) of DNA, generating millions of copies of the DNA sequence. This technique has been applied to many areas of medicine, such as the diagnosis of infectious and hereditary diseases, and to physical anthropology. It has also revolutionized forensic DNA profiling in criminal investigation, which began in England in the 1980s with the use of restriction fragment length polymorphism, an earlier and more cumbersome method of using DNA sequences for identification.³
A more recent transformative event in modern biology took place at the University of Wisconsin in 1998. James Thomson isolated and cultured the first human embryonic stem cells from donated early stage human embryos. His discovery was built on the achievements of predecessors including Sir Martin J. Evans, who was awarded the Nobel Prize in Physiology or Medicine for isolating embryonic stem cells in mouse blastocysts and using them to produce transgenic mice (a transgenic animal has had genes from another species transferred to its genome). Thomson’s discovery created an international tsunami in cell biology. The new operative phrase was regenerative medicine.
When certain cells in the body are damaged or die, they do not regenerate themselves to create new tissue. This is true of brain cells (after a stroke), nerve cells (after spinal cord injury), heart cells (after a heart attack), and retinal cells (from macular degeneration). Human embryonic stem cells are the precursors for all cells in the body. Therefore, if those cells could be harvested and given the right signals, then the differentiated cells they produce, when introduced into the right location in the body, could in theory regenerate new cells and repair damaged tissue. The excitement that ran through the scientific and biomedical community was palpable. New centers of regenerative medicine were established. Voters in the state of California passed an unprecedented bond issue to fund a stem cell institute that circumvented the federal legal quagmire over using human embryos for developing cell lines. The fields of cell and tissue biology were reinvented as the new frontier in biomedical research for the twenty-first century. And while genetics certainly played a role, the proof of concept was in getting stem cells to do, under scientific direction, what they do naturally in the normal development of an organism.
The stem cell research program faced many social obstacles—not the least of which was the new demand for embryos from which to harvest the embryonic stem cells. The scientific and public responses became inextricably intertwined. The social issues faced by stem cell scientists were different than those of the early recombinant DNA scientists. Geneticists in the 1970s dealt with concerns about whether gene-splicing experiments might introduce new pathogens. And although a small minority of voices challenged the use of gene splicing as unnatural, such concerns had an imperceptible impact on the progress of the field.
In contrast, stem cell science met society head on almost immediately over the issue of destroying human embryos to obtain the highly valued stem cells. The public and scientific discourses took many different trajectories. The complexity of the wide-ranging discussions included the hopes and dreams of individuals who were given new reason to believe they could be cured, like Christopher Reeve, the actor superhero who became paralyzed after he fell from a horse. He considered stem cell therapy the best hope for treating his spinal cord injury. The popular cinema and TV actor Michael J. Fox embraced the new research in stem cells as a promising treatment strategy for his own Parkinson’s disease.
When the administration of George W. Bush put limits on federal funding for human embryonic stem cell research, the policy acted like an accelerant, feeding the passions of those who believed that biomedical science had reached a new plateau that would forever change the treatment of chronic, incapacitating, and life-threatening diseases. The obstacles set by Congress and the president made stem cell advocates more aggressive in raising private money and winning public acceptance.
In co-teaching several courses on stem cells and human enhancement
with two cell biologists engaged in stem cell research and a philosopher, I observed a rich tapestry of social and scientific discourses that engaged ethics, science, religion, social media, government, law, and economics. I thought about how best to present these issues to a general audience in an accessible but scientifically sound way, and was reminded of the dialogues I read episodically throughout my education. One of the oldest applications of the dialogue form was by the Greek philosopher Plato, who used his teacher Socrates as the main character. The Socratic Dialogues
illustrate the conflict between Plato’s philosophy and the values that were prevalent in his society during the fifth century B.C. in Athens. Plato’s incorporation of the dialogue form was an affirmation that philosophical inquiry is a social enterprise. When people are confronted with alternative viewpoints, they have an opportunity to sharpen, correct, or retract their original position. His dialogues also invite readers to take sides or to re-examine their own beliefs: the individual’s own point of view on a problem only emerges as it comes into conflict with the points of view expressed by other individuals participating in the dialogue.
⁴
Plato uses Socrates as the principal protagonist to cross-examine his main adversaries, to shake their confidence in their claims of authority on issues of piety, justice, or knowledge itself. Ultimately, his dialogues demonstrate that his adversaries do not know what they pretend to know. And his main protagonist, Socrates, expresses his obligation to question Athenians and affirms that the unexamined life is not worth living.
Here is a short segment from Plato’s The Meno, where the personages Meno and Socrates discuss the difference between opinion and knowledge.⁵
MENO: What do you mean by the word right
? [as in being correct]
SOCRATES: I will explain. If a man knew the way to Larisa, or anywhere else, and went to the place and led others thither, would he not be right and a good guide?
MENO: Certainly.
SOCRATES: And a person who had a right opinion about the way, but had never been and did not know, might be a good guide also, might he not?
MENO: Certainly.
SOCRATES: And while he has true opinion about that which the other knows he will be just as good a guide if he thinks the truth, as he who knows the truth.
MENO: Exactly.
SOCRATES: Then true opinion is as good a guide to correct action as knowledge; and that was the point which we omitted in our speculation about the nature of virtue, when we said that knowledge only is the guide of right action, whereas there is also right opinion.
MENO: True.
SOCRATES: Then right opinion is not less useful than knowledge?
MENO: The difference, Socrates, is only that he who has knowledge will always be right; but he who has right opinion will sometimes be right, and sometimes not.
…
SOCRATES: While [true opinions] abide with us they are beautiful and fruitful, but they run away out of the human soul, and do not remain long, and therefore they are not of much value until they are fastened by the tie of the cause…. But when they are bound, in the first place, they have the nature of knowledge; and, in the second place, they are abiding. And this is why knowledge is more honorable and excellent than true opinion, because fastened by a chain.⁶
As Plato conceived it, the dialogue is a literary form that gives the philosopher complete control over his argument. At times he allows Meno to ask questions and offer conclusions, but these are always consistent and in agreement with Plato’s views as expressed through the voice of Socrates. The reader is never in doubt about who is in charge.
Another historically significant dialogue is Galileo’s Dialogues Concerning Two New Sciences.⁷ Galileo selected advocates for two opposing views who speak in their local idiom and present contrasting scientific theories that distinguished his own views from those of his Aristotelian opponents.⁸ Simplicio represents the Aristotelian and Ptolemaic theory of the universe. Salviati presents the modern view via the Copernican theory, which Galileo supported. A third character in the Dialogues is Sagredo, representing an educated member of the public, cast as an unbiased observer responding to the adversaries.
Galileo used the dialogue form as a means to communicate his criticism of Aristotle’s generally accepted theory of moving bodies, that heavier bodies move faster than lighter bodies. In the following extract, Galileo frames a clever thought experiment in the