the great majority of people worldwide remain in the thrall of tribal organized religions, led by men who claim supernatural power in order to compete for the obedience and resources of the faithful. We are addicted to tribal conflict, which is harmless and entertaining if sublimated into team sports, but deadly when expressed as real-world ethnic, religious, and ideological struggles. There are other hereditary biases. Too paralyzed with self-absorption to protect the rest of life, we continue to tear down the natural environment, our species’ irreplaceable and most precious heritage. And it is still taboo to bring up population policies aiming for an optimum people density, geographic distribution, and age distribution.

Our joint report was published on August 26, 2010, as the cover article of the prestigious journal Nature. Knowing the controversy involved, the Nature editors had proceeded with unusual caution. One of them familiar with the subject and the mode of mathematical analysis came from London to Harvard to hold a special meeting with Nowak, Tarnita, and myself. He approved, and the manuscript was next examined by three anonymous experts. Its appearance, as we expected, caused a Vesuvian explosion of protest — the kind cherished by journalists. No fewer than 137 biologists committed to inclusive fitness theory in their research or teaching signed a protest in a Nature article published the following year. When I repeated part of my argument as a chapter in the 2012 book The Social Conquest of Earth, Richard Dawkins responded with the indignant fervor of a true believer. In his review for the British magazine Prospect, he urged others not to read what I had written, but instead to cast the entire book away, “with great force,” no less.

Those that do best for their citizens in quality of life, from education and medical care to crime control and collective self-esteem, also have the lowest income differential between the wealthiest and poorest citizens. Among twenty-three of the world’s wealthiest countries and individual U.S. states, according to an analysis in 2009 by Richard Wilkinson and Kate Pickett, Japan, the Nordic countries, and the U.S. state of New Hampshire have both the narrowest wealth differential and the highest average quality of life. At the bottom are the United Kingdom, Portugal, and the remainder of the United States.

All my life I have placed great store in civility and good manners, practices I find scarce among the often hard-edged, badly socialized scientists with whom I associate. Tone of voice means a great deal to me in the course of debate. I despise the arrogance and doting self-regard so frequently found among the very bright.

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Is a universe of discrete material particles possible only with one specific set of natural laws and parameter values? In other words, does human imagination, which can conceive of other laws and values, thereby exceed possible existence?

I don’t believe it too harsh to say that the history of philosophy when boiled down consists mostly of failed models of the brain. A few of the modern neurophilosophers such as Patricia Churchland and Daniel Dennett have made a splendid effort to interpret the findings of neuroscience research as these become available. They have helped others to understand, for example, the ancillary nature of morality and rational thought. Others, especially those of poststructuralist bent, are more retrograde. They doubt that the “reductionist” or “objectivist” program of the brain researchers will ever succeed in explaining the core of consciousness. Even if it has a material basis, subjectivity in this view is beyond the reach of science. To make their argument, the mysterians (as they are sometimes called) point to the qualia, the subtle, almost inexpressible feelings we experience about sensory input. For example, “red” we know from physics, but what are the deeper sensations of “redness”? So what can the scientists ever hope to tell us in larger scale about free will, or about the soul, which for religious thinkers at least is the ultimate of ineffability?