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Today biological science is rising on a wall of worry. No other science has advanced more dramatically during the past several decades or yielded so many palpable improvements in human welfare. Yet none except nuclear physics has aroused greater apprehensions among the general public and leaders in such diverse fields as religion, the humanities, and government.

In this engaging book, Leon R. Kass, the noted teacher, scientist, humanist, and chairman of the President's Council on Bioethics, and James Q. Wilson, the preeminent political scientist to whom four United States presidents have turned for advice on crime, drug abuse, education, and other crises in American life, explore the ethics of human cloning, reproductive technology, and the teleology of human sexuality.

Although in their lively dialgoue both authors share a fundamental distrust of the notion of human cloning, they base their reticence on different views of the role of sexual reproduction and the role of the family. Professor Kass contends that in vitro fertilization and other assisted reproudction technologies that place the origin of human life in human hands have eroded the respect for the mystery of sexuality and human renewal. Professor Wilson, in contrast, asserts that whether a human life is created naturally or artificially is immaterial as long as the child is raised by loving parents in a two-parent family and is not harmed by the means of its conception.

This accessible volume promises to inform the public policy debate over the permissible conduct of genetic research and the permissible uses of its discoveries.

Leon R. Kass is chairman of the President's Council on Bioethics, the Addie Clark Harding Professor in the Committee on Social Thought and the College of University of Chicago, and the Hertog Fellow at AEI. He is the author of Toward a More Natural Science: Biology and Human Affairs (Free Press, 1985) and The Hungry Soul: Eating and the Perfecting of Our Nature (Free Press, 1994).

James Q. Wilson is the James A. Collins Professor of Mangaement and Public Policy Emeritus at the University of California, Los Angeles. He is the author of Crime and Human Nature (with Richard J. Herrnstein) (Simon & Schuster, 1985), Thinking about Crime (Vintage Books, 1977), On Character (AEI Press, 1991, 1995), The Moral Sense (Free Press, 1993) and Moral Judgment (Basic Books, 1997).