There is indeed a deep and well-established kinship between science and the left, one that reaches to the earliest days of modern science and politics and has grown stronger with time. Even though they go astray in caricaturing conservatives as anti-science Luddites, American liberals and progressives are not mistaken to think of themselves as the party of science. They do, however, tend to focus on only a few elements and consequences of that connection, and to look past some deep and complicated problems in the much-valued relationship. The profound ties that bind science and the left can teach us a great deal about both.

It is not unfair to suggest that the right emerged in response to the left, as the anti-traditional theory and practice of the French Revolution provoked a powerful reaction in defense of a political order built to suit human nature and tested and tried through generations of practice and reform.

The left, however, did not emerge in response to the right. It emerged in response to a new set of ideas and intellectual possibilities that burst onto the European scene in the seventeenth and eighteenth centuries—ideas and possibilities that we now think of as modern scientific thought.

Both as action and as knowledge, then, science has been a source of inspiration for progressives and for liberals, and its advancement has been one of their great causes. That does not mean that science captures all there is to know about the left. Far from it. The left has always had a deeply romantic and even anti-rationalist side too, reaching back almost as far as its scientism. But in its basic view of knowledge, power, nature, and man, the left owes much to science. And in the causes it chooses to advance in our time, it often looks to scientific thought and practice for guidance. In its most essential disagreements with the right—in particular, about tradition—the vision defended by the left is also a vision of scientific progress.

Not all environmentalism indulges in such anti-humanism, to be sure. But in all of its forms, the environmentalist ethic calls for a science of beholding nature, not of mastering it. Far from viewing nature as the oppressor, this new vision sees nature as a precious, vulnerable, and almost benevolent passive environment, held in careful balance, and under siege by human action and human power. This view of nature calls for human restraint and humility—and for diminished expectations of human power and potential.The environmental movement is, in this sense, not a natural fit for the progressive and forward-looking mentality of the left. Indeed, in many important respects environmentalism is deeply conservative. It takes no great feat of logic to show that conservation is conservative, of course, but the conservatism of the environmental movement runs far deeper than that. The movement seeks to preserve a given balance which we did not create, are not capable of fully understanding, and should not delude ourselves into imagining we can much improve—in other words, its attitude toward nature is much like the attitude of conservatism toward society.

Moreover, contemporary environmentalism is deeply moralistic. It speaks of duties and responsibilities, of curbing arrogance and vice.

But whatever the reason, environmentalism, and with it a worldview deeply at odds with that behind the scientific enterprise, has come to play a pivotal role in the thinking of the left.

The American left seeks to be both the party of science and the party of equality. But in the coming years, as the biotechnology revolution progresses, it will increasingly be forced to confront the powerful tension between these two aspirations.

To choose well, the American left will need first to understand that a choice is even needed at all—that this tension exists between the ideals of progressives, and the ideology of science.

The answer, as ever, is moderation. The American left, like the American right, must understand science as a human endeavor with ethical purposes and practical limits, one which must be kept within certain boundaries by a self-governing people. In failing to observe and to enforce those boundaries, the left threatens its own greatest assets, and exacerbates tensions at the foundations of American political life. To make the most of the benefits scientific advancement can bring us, we must be alert to the risks it may pose. That awareness is endangered by the closing of the gap between science and the left—and the danger is greatest for the left itself.

The essence of the Web is the linking of individual “pages” on websites, one to another. Every link represents a recommendation—a vote of interest, if not quality. So the algorithm assigns every page a rank, depending on how many other pages link to it. Furthermore, all links are not valued equally. A recommendation is worth more when it comes from a page that has a high rank itself. The math isn’t trivial—PageRank is a probability distribution, and the calculation is recursive, each page’s rank depending on the ranks of pages that depend…and so on. Page and Brin patented PageRank and published the details even before starting the company they called Google.

As they saw it from the first, their mission encompassed not just the Internet but all the world’s books and images, too.

He argues that the real object of healing is not the body, but the mind.  A plastic surgeon is a “psychologist with a scalpel in his hand.” This idea led Pitanguy to argue for the “union” of cosmetic and reconstructive procedures.  In both types of surgery beauty and mental healing subtly mingle, he claims, and both benefit health.

“What is the difference between a plastic surgeon and a psychoanalyst?  The psychoanalyst knows everything but changes nothing.  The plastic surgeon knows nothing but changes everything.”

Plastic surgery gained legitimacy in the early 20th century by limiting itself to reconstructive operations.  The “beauty doctor” was a term of derision.  But as techniques improved they were used for cosmetic improvements.  Missing, however, was a valid diagnosis. Concepts like psychoanalyst Alfred Adler’s inferiority complex — and later low self-esteem — provided a missing link.

Victorians saw a cleft palate as a defect that built character. For us it hinders self-realization and merits corrective surgery.  This shift reflects a new attitude towards appearance and mental health: the notion that at least some defects cause unfair suffering and social stigma is now widely accepted. But Brazilian surgeons take this reasoning a step further.  Cosmetic surgery is a consumer service in most of the world.  In Brazil it is becoming, as Ester put it, a “necessary vanity.”

Pitanguy, whose patients often have mixed African, indigenous and European ancestry, stresses that aesthetic ideals vary by epoch and ethnicity.  What matters are not objective notions of beauty, but how the patient feels.  As his colleague says, the job of the plastic surgeon is to simply “follow desires.”

Patients are on average younger than they were 20 years ago.  They often request minor changes to become, as one surgeon said, “more perfect.”

The growth of plastic surgery thus reflects a new way of working not only on the suffering mind, but also on the erotic body.  Unlike fashion’s embrace of playful dissimulation and seduction, this beauty practice instead insists on correcting precisely measured flaws.  Plastic surgery may contribute to a biologized view of sex where pleasure and fantasy matter less than the anatomical “truth” of the bare body.

It is not coincidental that Brazil has not only high rates of plastic surgery, but also Cesarean sections (70 percent of deliveries in some private hospitals), tubal ligations,  and other surgeries for women. Some women see elective surgeries as part of a modern standard of care, more or less routine for the middle class, but only sporadically available to the poor.

When a good life is defined through the ability to buy goods then rights may be reinterpreted to mean not equality before the law, but equality in the market. 

Beauty is unfair: the attractive enjoy privileges and powers gained without merit.  As such it can offend egalitarian values.  Yet while attractiveness is a quality “awarded” to those who don’t morally deserve it, it can also grant power to those excluded from other systems of privilege.  It is a kind of “double negative”: a form of power that is unfairly distributed but which can disturb other unfair hierarchies.  For this reason it may have democratic appeal.  In poor urban areas beauty often has a similar importance for girls as soccer (or basketball) does for boys: it promises an almost magical attainment of recognition, wealth or power.

For many consumers attractiveness is essential to economic and sexual competition, social visibility, and mental well being.  This “value” of appearance may be especially clear for those excluded from other means of social ascent.  For the poor beauty is often a form of capital that can be exchanged for other benefits, however small, transient, or unconducive to collective change.

Mr. Bishop said Americans now choose “in their neighborhoods and their churches, to be around others who live like they do and think like they do — and, every four years, vote like they do.”

All this adds up to a kind of political echo chamber, in which like-minded thinkers reinforce one other.

He tested his thesis with an examination of the shifting geography of presidential politics, beginning in 1976, when Jimmy Carter won the presidency by the slimmest of margins, with 50.1 percent of the vote. That year, 26.8 percent of Americans lived in “landslide counties,” which voted either Democratic or Republican by 20 percentage points or more. By 2000, when Al Gore and George W. Bush split the popular vote, 45.3 percent of Americans lived in landslide counties. In 2008, the figure was 47.6 percent.

In 1980, Democrats and Republicans attended church at roughly the same rates. But Robert Putnam, a professor of public policy at Harvard who explores “the God gap” in his book “American Grace,” finds attendance has since gone up markedly for Republicans and declined among Democrats — a sign, he said, that “people are changing their involvement with religion as a function of their politics.”

Political clustering is reflected in religious participation and even shopping choices. David Wasserman, of the nonpartisan Cook Political Report, recently calculated that 89 percent of the Whole Foods stores in the United States were in counties carried by Barack Obama in 2008, while 62 percent of Cracker Barrel restaurants were in counties carried by John McCain.

“Political activism is much easier when you’re surrounded by like-minded others,” said Diana Mutz, a political scientist at the University of Pennsylvania and author of “Hearing the Other Side.” “The very kind of environment that might be more likely to increase people’s exposures to different viewpoints and convince them that compromise is necessary is not the kind of environment that encourages them to speak out politically or get involved.”

Marketers, though, offer another explanation. Americans, they say, may profess an interest in compromise, as an abstract goal or principle. But they don’t want to make the trade-offs necessary to cut a deal. Daniel Yankelovich, a market researcher, developed what he called the “mushiness index” to assess whether people truly understand the costs associated with the principles they express.

Today, people can buy all sorts of products — from Converse sneakers to Dell computers — designed exactly as they want them. If Americans don’t want to compromise in buying sneakers, he reasons, why would they make trade-offs in politics?

There is the eclipse of the public intellectual in the general media by the pundit who substitutes outrageousness for thoughtfulness, and the concomitant decline of the essay in general-interest magazines. And there is the rise of an increasingly visual culture, especially among the young — a form in which ideas are more difficult to express.

a time when we know more than we have ever known, we think about it less.

Western Governors is entirely online, for one thing. Technically it doesn't offer courses; instead it provides mentors who help students prepare for a series of high-stakes homework assignments. Those assignments are designed by a team of professional test-makers to prove competence in various subject areas. The idea is that as long as students can leap all of those hurdles, they deserve degrees, whether or not they've ever entered a classroom, watched a lecture video, or participated in any other traditional teaching experience. The model is called "competency-based education."

Ms. Johnson explains that Western Governors essentially splits the role of the traditional professor into two jobs. Instructional duties fall to a group the university calls "course mentors," who help students master material. The graders, or evaluators, step in once the homework is filed, with the mind-set of, "OK, the teaching's done, now our job is to find out how much you know," says Ms. Johnson. They log on to a Web site called TaskStream and pluck the first assignment they see. The institution promises that every assignment will be graded within two days of submission.

Western Governors requires all evaluators to hold at least a master's degree in the subject they're grading.

Evaluators are required to write extensive comments on each task, explaining why the student passed or failed to prove competence in the requisite skill. No letter grades are given—students either pass or fail each task.

Another selling point is the software's fast response rate. It can grade a batch of 1,000 essay tests in minutes. Professors can set the software to return the grade immediately and can give students the option of making revisions and resubmitting their work on the spot.

All evaluators initially receive a month of training, conducted online, about how to follow each task's grading guidelines, which lay out characteristics of a passing score.

Other evaluators want to push talented students to do more than the university's requirements for a task, or to allow a struggling student to pass if he or she is just under the bar. "Some people just can't acclimate to a competency-based environment," says Ms. Johnson. "I tell them, If they don't buy this, they need to not be here.

She and some teaching assistants scored the tests by hand and compared their performance with the computer's.

The graduate students became fatigued and made mistakes after grading several tests in a row, she told me, "but the machine was right-on every time."

He argues that students like the idea that their tests are being evaluated in a consistent way.

The graders must regularly participate in "calibration exercises," in which they grade a simulated assignment to make sure they are all scoring consistently. As the phrase suggests, the process is designed to run like a well-oiled machine.

He said once students get essays back instantly, they start to view essay tests differently. "It's almost like a big math problem. You don't expect to get everything right the first time, but you work through it.

robot grading is the hottest trend in testing circles, says Jacqueline Leighton, a professor of educational psychology at the University of Alberta who edits the journal Educational Measurement: Issues and Practice. Companies building essay-grading robots include the Educational Testing Service, which sells e-rater, and Pearson Education, which makes Intelligent Essay Assessor. "The research is promising, but they're still very much in their infancy," Ms. Leighton says.

Some experts displayed a top-down style of reasoning: politics as a deductive art. They started with a big-idea premise about human nature, society, or economics and applied it to the specifics of the case. They tended to reach more confident conclusions about the future. And the positions they reached were easier to classify ideologically: that is the Keynesian prediction and that is the free-market fundamentalist prediction and that is the worst-case environmentalist prediction and that is the best case technology-driven growth prediction etc. Other experts displayed a bottom-up style of reasoning: politics as a much messier inductive art. They reached less confident conclusions and they are more likely to draw on a seemingly contradictory mix of ideas in reaching those conclusions (sometimes from the left, sometimes from the right). We called the big-idea experts “hedgehogs” (they know one big thing) and the more eclectic experts “foxes” (they know many, not so big things).

The most consistent predictor of consistently more accurate forecasts was “style of reasoning”: experts with the more eclectic, self-critical, and modest cognitive styles tended to outperform the big-idea people (foxes tended to outperform hedgehogs).

Lehrer: Can non-experts do anything to encourage a more effective punditocracy?

Tetlock: Yes, non-experts can encourage more accountability in the punditocracy. Pundits are remarkably skillful at appearing to go out on a limb in their claims about the future, without actually going out on one. For instance, they often “predict” continued instability and turmoil in the Middle East (predicting the present) but they virtually never get around to telling you exactly what would have to happen to disconfirm their expectations. They are essentially impossible to pin down. If pundits felt that their public credibility hinged on participating in level playing field forecasting exercises in which they must pit their wits against an extremely difficult-to-predict world, I suspect they would be learn, quite quickly, to be more flexible and foxlike in their policy pronouncements.

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I continue to believe, to walk the paths of faith, because I believe a story and continue to choose to believe that story. More precisely, I believe in a grand sacred history that has been given embodiment in a plurality of diverse narratives, epistles, and other sacred writings. I interpret these writings in ways literal and figurative and in ways between. While I don’t look to the books of the New Testament for a historical transcript of the life of Christ, I cling to the hope that they reveal a Divine Person and give flesh and blood anew to impossible events, namely the Incarnation, the Crucifixion, the Resurrection, and the Ascension. On the one hand, my choice to believe the truth of these writings—writings that don’t perfectly add up, to be sure—is a decision to believe that an underlying thematic truth speaks through incredible, fantastical tales told to me by mostly unknown strangers, and passed down to me by figures holy and insidious, self-giving and power-hungry, saintly and vicious. On the other hand, I find some of those who have told and retold these stories, particularly the early Christian martyrs, to be credible witnesses. Those who have given their lives for Christ did so not merely in defiance of their murders, but as an act of witness embraced in the hope that their enemies would become their brothers and sisters. That kind of love strikes me as the height of love. And it’s been known to work wonders.

What does my faith give me? It gives me a love story. Not a story that explains love, but a story that gives birth to—and directs my heart, mind, and very being to—the fullest expression and fulfillment of love. It is a story that means everything if it means anything at all. It is a story about what it means to be human and what it means to be divine, both of which tell of what it means to love. My religion tells a love story about a humble God who reveals and who gives humanity, through the sacraments and other gifts, the grace to respond in faith, hope, and most importantly love. In this sacred romance, faith and hope are not ends in themselves, or even eternal things, but the temporal means to an eternal end. That end is love. According to this story, there is no need for faith or hope in heaven, and so you will not find them there. What you will find, if there is anything after death to find or a paradise to find it, is love.

My faith doesn’t free me from these unsettling possibilities. It doesn’t whisk me away from the battlefield like a protective Aphrodite. Instead, it fills me with fear and trembling and places me in the hopeless situation of not knowing what I love when I love my God. Yet I would not choose to be anywhere else. I’ve no interest in certainty, gnosis, or other false comforts. Nor do I wish to close the book of faith and place it on the bookshelf, unread, ignored and unlived. I intend to live according to a story I love, to share it with those I love, and to allow it to guide my steps and convert my soul, even though I journey to who knows where. And I intend as well to incline an ear to the voice of alterity, to reasons and rhymes that might expose my faith to its undoing.

Tooby and Cosmides ran their simulation for tens of thousands of generations, to figure out where the generosity thermostat would get set. They find that it makes more sense to adopt a general attitude of generosity, in the hope that paying it forward now will pay back later. What does this all mean for how we think about ourselves? To the researchers, it suggests that "human generosity, far from being a thin veneer of cultural conditioning atop a Machiavellian core, may turn out to be a bedrock feature of human nature." Why? Because thousands of years of small-town living have left their mark.

Why would you choose to cooperate or cheat? The answer hinges, essentially, on a guess: For many encounters, you simply can't know whether or not they'll be one-shot or repeated.

There are whole cultures, he said, that have little to no printed material to cite as proof about the way life is lived.

he and the video’s directors, Priya Sen and Zen Marie, spoke with people in African and Indian villages either in person or over the phone and had them describe basic activities. These recordings were then uploaded and linked to the article as sources, and suddenly an article that seems like it could be a personal riff looks a bit more academic.

After a series of hoaxes, culminating in a Wikipedia article in 2005 that maligned the newspaper editor John Seigenthaler for no discernible reason other than because a Wikipedia contributor could, the site tried to ensure that every statement could be traced to a source.

Then there is the rule “no original research,” which was meant to say that Wikipedia doesn’t care if you are writing about the subway station you visit every day, find someone who has written reliably on the color of the walls there.

Perhaps Mr. Prabhala’s most challenging argument is that by being text-focused, and being locked into the Encyclopedia Britannica model, Wikipedia risks being behind the times.

An 18-year-old is comfortable using “objects of trust that have been created on the Internet,” he said, and “Wikipedia isn’t taking advantage of that.”