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He advised logging off sites like Google and Facebook as soon as practicably possible and not using the same provider for multiple functions if you can help it. “If you search on Google, maybe you don’t want to use Gmail for your e-mail,”

Another shrouding tactic is to use the search engine DuckDuckGo, which distinguishes itself with a “We do not track or bubble you!” policy. Bubbling is the filtering of search results based on your search history. (Bubbling also means you are less likely to see opposing points of view or be exposed to something fresh and new.)

turn on your browser’s “private mode,” usually found under Preferences, Tools or Settings. When this mode is activated, tracking cookies are deleted once you close your browser, which “essentially wipes clean your history,”

private mode does nothing to conceal your I.P. address, a unique number that identifies your entry or access point to the Internet. So Web sites may not know your browsing history, but they will probably know who you are and where you are as well as when and how long you viewed their pages.

Shielding your I.P. address is possible by connecting to what is called a virtual private network, or V.P.N., such as those offered by WiTopia, PrivateVPN and StrongVPN. These services, whose prices price from $40 to $90 a year, route your data stream to what is called a proxy server, where it is stripped of your I.P. address before it is sent on to its destination. This obscures your identity not only from Web sites but also from your Internet service provider.

there is Tor, a free service with 36 million users that was originally developed to conceal military communications. Tor encrypts your data stream and bounces it through a series of proxy servers so no single entity knows the source of the data or whence it came. The only drawback is that with all that bouncing around, it is very S-L-O-W.

Free browser add-ons that increase privacy and yet will not interrupt your work flow include Ghostery and Do Not Track Plus, which prevent Web sites from relaying information about you and your visit to tracking companies.

“Companies like Google are creating these enormous databases using your personal information,” said Paul Hill, senior consultant with SystemExperts, a network security company in Sudbury, Mass. “They may have the best of intentions now, but who knows what they will look like 20 years from now, and by then it will be too late to take it all back.”

The impacts of technological change take their time appearing. They also vary hugely from industry to industry. Although in many simple economic models technology pairs neatly with capital and labour to produce output, in practice technological changes do not affect all workers the same way. Some find that their skills are complementary to new technologies. Others find themselves out of work.

The case for a highly disruptive period of economic growth is made by Erik Brynjolfsson and Andrew McAfee, professors at MIT, in “The Second Machine Age”, a book to be published later this month. Like the first great era of industrialisation, they argue, it should deliver enormous benefits—but not without a period of disorienting and uncomfortable change

Their argument rests on an underappreciated aspect of the exponential growth in chip processing speed, memory capacity and other computer metrics: that the amount of progress computers will make in the next few years is always equal to the progress they have made since the very beginning. Mr Brynjolfsson and Mr McAfee reckon that the main bottleneck on innovation is the time it takes society to sort through the many combinations and permutations of new technologies and business models.

A startling progression of inventions seems to bear their thesis out. Ten years ago technologically minded economists pointed to driving cars in traffic as the sort of human accomplishment that computers were highly unlikely to master. Now Google cars are rolling round California driver-free

Even after computers beat grandmasters at chess (once thought highly unlikely), nobody thought they could take on people at free-form games played in natural language. Then Watson, a pattern-recognising supercomputer developed by IBM, bested the best human competitors in America’s popular and syntactically tricksy general-knowledge quiz show “Jeopardy!” Versions of Watson are being marketed to firms

Text-mining programs will displace professional jobs in legal services. Biopsies will be analysed more efficiently by image-processing software than lab technicians. Accountants may follow travel agents and tellers into the unemployment line as tax software improves. Machines are already turning basic sports results and financial data into good-enough news stories.

A taxi driver will be a rarity in many places by the 2030s or 2040s. That sounds like bad news for journalists who rely on that most reliable source of local knowledge and prejudice—but will there be many journalists left to care? Will there be airline pilots? Or traffic cops? Or soldiers?

Tyler Cowen, an economist at George Mason University and a much-read blogger, writes in his most recent book, “Average is Over”, that rich economies seem to be bifurcating into a small group of workers with skills highly complementary with machine intelligence, for whom he has high hopes, and the rest, for whom not so much.

the second machine age will make such trial and error easier. It will be shockingly easy to launch a startup, bring a new product to market and sell to billions of global consumers (see article). Those who create or invest in blockbuster ideas may earn unprecedented returns as a result.

Thomas Piketty, an economist at the Paris School of Economics, argues along similar lines that America may be pioneering a hyper-unequal economic model in which a top 1% of capital-owners and “supermanagers” grab a growing share of national income and accumulate an increasing concentration of national wealth

The rise of the middle-class—a 20th-century innovation—was a hugely important political and social development across the world. The squeezing out of that class could generate a more antagonistic, unstable and potentially dangerous politics.

The current doldrum in wages may, like that of the early industrial era, be a temporary matter, with the good times about to roll (see chart 3). These jobs may look distinctly different from those they replace. Just as past mechanisation freed, or forced, workers into jobs requiring more cognitive dexterity, leaps in machine intelligence could create space for people to specialise in more emotive occupations, as yet unsuited to machines: a world of artists and therapists, love counsellors and yoga instructors.

though growth in areas of the economy that are not easily automated provides jobs, it does not necessarily help real wages. Mr Summers points out that prices of things-made-of-widgets have fallen remarkably in past decades; America’s Bureau of Labour Statistics reckons that today you could get the equivalent of an early 1980s television for a twentieth of its then price,

owever, prices of things not made of widgets, most notably college education and health care, have shot up

As innovation continues, automation may bring down costs in some of those stubborn areas as well, though those dominated by scarcity—such as houses in desirable places—are likely to resist the trend, as may those where the state keeps market forces at bay. But if innovation does make health care or higher education cheaper, it will probably be at the cost of more jobs, and give rise to yet more concentration of income.

Adaptation to past waves of progress rested on political and policy responses. The most obvious are the massive improvements in educational attainment brought on first by the institution of universal secondary education and then by the rise of university attendance. Policies aimed at similar gains would now seem to be in order. But as Mr Cowen has pointed out, the gains of the 19th and 20th centuries will be hard to duplicate.

Boosting the skills and earning power of the children of 19th-century farmers and labourers took little more than offering schools where they could learn to read, write and do algebra. Pushing a large proportion of college graduates to complete graduate work successfully will be harder and more expensive. Perhaps cheap and innovative online education will indeed make new attainment possible. But as Mr Cowen notes, such programmes may tend to deliver big gains only for the most conscientious students.

Everyone should be able to benefit from productivity gains—in that, Keynes was united with his successors. His worry about technological unemployment was mainly a worry about a “temporary phase of maladjustment” as society and the economy adjusted to ever greater levels of productivity

However, society may find itself sorely tested if, as seems possible, growth and innovation deliver handsome gains to the skilled, while the rest cling to dwindling employment opportunities at stagnant wages.

A recent series of articles on fraternities by Bloomberg News’s David Glovin and John Hechinger notes that since 2005, more than 60 people—the majority of them students—have died in incidents linked to fraternities, a sobering number in itself, but one that is dwarfed by the numbers of serious injuries, assaults, and sexual crimes that regularly take place in these houses.

I have spent most of the past year looking deeply into the questions posed by these lawsuits, and more generally into the particular nature of fraternity life on the modern American campus

to answer the vexing question “why don’t colleges just get rid of their bad fraternities?”—the system, and its individual frats, have only grown in power and influence. Indeed, in many substantive ways, fraternities are now mightier than the colleges and universities that host them.

The entire multibillion-dollar, 2,000-campus American college system

the Kappa Alpha Society. Word of the group spread, and a new kind of college institution was founded, and with it a brand-new notion: that going to college could include some pleasure. It was the American age of societies, and this new type fit right in.

every moment of the experience is sweetened by the general understanding that with each kegger and rager, each lazy afternoon spent snoozing on the quad (a forgotten highlighter slowly drying out on the open pages of Introduction to Economics, a Coke Zero sweating beside it), they are actively engaged in the most significant act of self-improvement available to an American young person: college!

There are many thousands of American undergraduates whose economic futures (and those of their parents) would be far brighter if they knocked off some of their general-education requirements online, or at the local community college—for pennies on the dollar—before entering the Weimar Republic of traditional-college pricing. But college education, like weddings and funerals, tends to prompt irrational financial decision making,

depends overwhelmingly for its very existence on one resource: an ever-renewing supply of fee-paying undergraduates. It could never attract hundreds of thousands of them each year—many of them woefully unprepared for the experience, a staggering number (some 40 percent) destined never to get a degree, more than 60 percent of them saddled with student loans that they very well may carry with them to their deathbeds—if the experience were not accurately marketed as a blast.

When colleges tried to shut them down, fraternities asserted that any threat to men’s membership in the clubs constituted an infringement of their right to freedom of association. It was, at best, a legally delicate argument, but it was a symbolically potent one, and it has withstood through the years. The powerful and well-funded political-action committee that represents fraternities in Washington has fought successfully to ensure that freedom-of-association language is included in all higher-education reauthorization legislation, thus “disallowing public Universities the ability to ban fraternities.”

While the fraternities continued to exert their independence from the colleges with which they were affiliated, these same colleges started to develop an increasingly bedeviling kind of interdependence with the accursed societies

the fraternities involved themselves very deeply in the business of student housing, which provided tremendous financial savings to their host institutions, and allowed them to expand the number of students they could admit. Today, one in eight American students at four-year colleges lives in a Greek house

fraternities tie alumni to their colleges in a powerful and lucrative way. At least one study has affirmed what had long been assumed: that fraternity men tend to be generous to their alma maters. Furthermore, fraternities provide colleges with unlimited social programming of a kind that is highly attractive to legions of potential students

It is true that fraternity lawsuits tend to involve at least one, and often more, of the four horsemen of the student-life apocalypse, a set of factors that exist far beyond frat row

the binge-drinking epidemic, which anyone outside the problem has a hard time grasping as serious (everyone drinks in college!) and which anyone with knowledge of the current situation understands as a lurid and complicated disaster

The second is the issue of sexual assault of female undergraduates by their male peers, a subject of urgent importance but one that remains stubbornly difficult even to quantify

The third is the growing pervasiveness of violent hazing on campus

But it’s impossible to examine particular types of campus calamity and not find that a large number of them cluster at fraternity houses

the fourth is the fact that Boomers, who in their own days destroyed the doctrine of in loco parentis so that they could party in blissful, unsupervised freedom, have grown up into the helicopter parents of today

during the period of time under consideration, serious falls from fraternity houses on the two Palouse campuses far outnumbered those from other types of student residences, including privately owned apartments occupied by students. I began to view Amanda Andaverde’s situation in a new light.

Why are so many colleges allowing students to live and party in such unsafe locations? And why do the lawsuits against fraternities for this kind of serious injury and death—so predictable and so preventable—have such a hard time getting traction? The answers lie in the recent history of fraternities and the colleges and universities that host them.

This question is perhaps most elegantly expressed in the subtitle of Robert D. Bickel and Peter F. Lake’s authoritative 1999 book on the subject, The Rights and Responsibilities of the Modern University: Who Assumes the Risks of College Life?

The answer to this question has been steadily evolving ever since the 1960s, when dramatic changes took place on American campuses, changes that affected both a university’s ability to control student behavior and the status of fraternities in the undergraduate firmament. During this period of student unrest, the fraternities—long the unquestioned leaders in the area of sabotaging or ignoring the patriarchal control of school administrators—became the exact opposite: representatives of the very status quo the new activists sought to overthrow. Suddenly their beer bashes and sorority mixers, their panty raids and obsession with the big game, seemed impossibly reactionary when compared with the mind-altering drugs being sampled in off-campus apartments where sexual liberation was being born and the Little Red Book proved, if nothing else, a fantastic coaster for a leaky bong.

American colleges began to regard their students not as dependents whose private lives they must shape and monitor, but as adult consumers whose contract was solely for an education, not an upbringing. The doctrine of in loco parentis was abolished at school after school.

Through it all, fraternities—for so long the repositories of the most outrageous behavior—moldered, all but forgotten.

Animal House, released in 1978, at once predicted and to no small extent occasioned the roaring return of fraternity life that began in the early ’80s and that gave birth to today’s vital Greek scene

In this newly forming culture, the drugs and personal liberation of the ’60s would be paired with the self-serving materialism of the ’80s, all of which made partying for its own sake—and not as a philosophical adjunct to solving some complicated problem in Southeast Asia—a righteous activity for the pampered young collegian. Fraternity life was reborn with a vengeance.

These new members and their countless guests brought with them hard drugs, new and ever-developing sexual attitudes, and a stunningly high tolerance for squalor

Adult supervision was nowhere to be found. Colleges had little authority to intervene in what took place in the personal lives of its students visiting private property. Fraternities, eager to provide their members with the independence that is at the heart of the system—and responsive to members’ wish for the same level of freedom that non-Greek students enjoyed—had largely gotten rid of the live-in resident advisers who had once provided some sort of check on the brothers

, in 1984 Congress passed the National Minimum Drinking Age Act, with the ultimate result of raising the legal drinking age to 21 in all 50 states. This change moved college partying away from bars and college-sponsored events and toward private houses—an ideal situation for fraternities

lawsuits began to pour in.

Liability insurance became both ruinously expensive and increasingly difficult to obtain. The insurance industry ranked American fraternities as the sixth-worst insurance risk in the country—just ahead of toxic-waste-removal companies.

For fraternities to survive, they needed to do four separate but related things: take the task of acquiring insurance out of the hands of the local chapters and place it in the hands of the vast national organizations; develop procedures and policies that would transfer as much of their liability as possible to outside parties; find new and creative means of protecting their massive assets from juries; and—perhaps most important of all—find a way of indemnifying the national and local organizations from the dangerous and illegal behavior of some of their undergraduate members.

comprising a set of realities you should absolutely understand in detail if your son ever decides to join a fraternity.

you may think you belong to Tau Kappa Epsilon or Sigma Nu or Delta Tau Delta—but if you find yourself a part of life-changing litigation involving one of those outfits, what you really belong to is FIPG, because its risk-management policy (and your adherence to or violation of it) will determine your fate far more than the vows you made during your initiation ritual

the need to manage or transfer risk presented by alcohol is perhaps the most important factor in protecting the system’s longevity. Any plaintiff’s attorney worth his salt knows how to use relevant social-host and dramshop laws against a fraternity; to avoid this kind of liability, the fraternity needs to establish that the young men being charged were not acting within the scope of their status as fraternity members. Once they violated their frat’s alcohol policy, they parted company with the frat.

there are actually only two FIPG-approved means of serving drinks at a frat party. The first is to hire a third-party vendor who will sell drinks and to whom some liability—most significant, that of checking whether drinkers are of legal age—will be transferred. The second and far more common is to have a BYO event, in which the liability for each bottle of alcohol resides solely in the person who brought it.

these policies make it possible for fraternities to be the one industry in the country in which every aspect of serving alcohol can be monitored and managed by people who are legally too young to drink it.

But when the inevitable catastrophes do happen, that policy can come to seem more like a cynical hoax than a real-world solution to a serious problem.

Thanks in part to the guest/witness list, Larry can be cut loose, both from the expensive insurance he was required to help pay for (by dint of his dues) as a precondition of membership, and from any legal defense paid for by the organization. What will happen to Larry now?

“I’ve recovered millions and millions of dollars from homeowners’ policies,” a top fraternal plaintiff’s attorney told me. For that is how many of the claims against boys who violate the strict policies are paid: from their parents’ homeowners’ insurance

, the Fraternal Information and Programming Group’s chillingly comprehensive crisis-management plan was included in its manual for many years

the plan serves a dual purpose, at once benevolent and mercenary. The benevolent part is accomplished by the clear directive that injured parties are to receive immediate medical attention, and that all fraternity brothers who come into contact with the relevant emergency workers are to be completely forthright

“Until proven otherwise,” Fierberg told me in April of fraternities, “they all are very risky organizations for young people to be involved in.” He maintains that fraternities “are part of an industry that has tremendous risk and a tremendous history of rape, serious injury, and death, and the vast majority share common risk-management policies that are fundamentally flawed. Most of them are awash in alcohol. And most if not all of them are bereft of any meaningful adult supervision.”

the interests of the national organization and the individual members cleave sharply as this crisis-management plan is followed. Those questionnaires and honest accounts—submitted gratefully to the grown-ups who have arrived, the brothers believe, to help them—may return to haunt many of the brothers, providing possible cause for separating them from the fraternity, dropping them from the fraternity’s insurance, laying the blame on them as individuals and not on the fraternity as the sponsoring organization.

So here is the essential question: In the matter of these disasters, are fraternities acting in an ethical manner, requiring good behavior from their members and punishing them soundly for bad or even horrific decisions? Or are they keeping a cool distance from the mayhem, knowing full well that misbehavior occurs with regularity (“most events take place at night”) and doing nothing about it until the inevitable tragedy occurs, at which point they cajole members into incriminating themselves via a crisis-management plan presented as being in their favor?

I have had long and wide-ranging conversations with both men, in which each put forth his perspective on the situation.

the young men who typically rush so gratefully into the open arms of the representatives from their beloved national—an outfit to which they have pledged eternal allegiance—would be far better served by not talking to them at all, by walking away from the chapter house as quickly as possible and calling a lawyer.

The fraternity system, he argues, is “the largest industry in this country directly involved in the provision of alcohol to underage people.” The crisis-management plans reveal that in “the foreseeable future” there may be “the death or serious injury” of a healthy young person at a fraternity function.

His belief is that what’s tarnishing the reputation of the fraternities is the bad behavior of a very few members, who ignore all the risk-management training that is requisite for membership, who flout policies that could not be any more clear, and who are shocked when the response from the home office is not to help them cover their asses but to ensure that—perhaps for the first time in their lives—they are held 100 percent accountable for their actions.

The fraternity system, he argues, is “the largest industry in this country directly involved in the provision of alcohol to underage people.” The crisis-management plans reveal that in “the foreseeable future” there may be “the death or serious injury” of a healthy young person at a fraternity function.

His belief is that what’s tarnishing the reputation of the fraternities is the bad behavior of a very few members, who ignore all the risk-management training that is requisite for membership, who flout policies that could not be any more clear, and who are shocked when the response from the home office is not to help them cover their asses but to ensure that—perhaps for the first time in their lives—they are held 100 percent accountable for their actions.

Unspoken but inherent in this larger philosophy is the idea that it is in a young man’s nature to court danger and to behave in a foolhardy manner; the fraternity experience is intended to help tame the baser passions, to channel protean energies into productive endeavors such as service, sport, and career preparation.

In a sense, Fierberg, Smithhisler, and the powerful forces they each represent operate as a check and balance on the system. Personal-injury lawsuits bring the hated media attention and potential financial losses that motivate fraternities to improve. It would be a neat, almost a perfect, system, if the people wandering into it were not young, healthy college students with everything to lose.

In a sense, Fierberg, Smithhisler, and the powerful forces they each represent operate as a check and balance on the system. Personal-injury lawsuits bring the hated media attention and potential financial losses that motivate fraternities to improve. It would be a neat, almost a perfect, system, if the people wandering into it were not young, healthy college students with everything to lose.

Wesleyan is one of those places that has by now become so hard to get into that the mere fact of attendance is testament, in most cases, to a level of high-school preparation—combined with sheer academic ability—that exists among students at only a handful of top colleges in this country and that is almost without historical precedent.

Wesleyan is one of those places that has by now become so hard to get into that the mere fact of attendance is testament, in most cases, to a level of high-school preparation—combined with sheer academic ability—that exists among students at only a handful of top colleges in this country and that is almost without historical precedent.

This January, after publishing a withering series of reports on fraternity malfeasance, the editors of Bloomberg.com published an editorial with a surprising headline: “Abolish Fraternities.” It compared colleges and universities to companies, and fraternities to units that “don’t fit into their business model, fail to yield an adequate return or cause reputational harm.”

A college or university can choose, as Wesleyan did, to end its formal relationship with a troublesome fraternity, but—if that fiasco proves anything—keeping a fraternity at arm’s length can be more devastating to a university and its students than keeping it in the fold.

A college or university can choose, as Wesleyan did, to end its formal relationship with a troublesome fraternity, but—if that fiasco proves anything—keeping a fraternity at arm’s length can be more devastating to a university and its students than keeping it in the fold.

there is a Grand Canyon–size chasm between the official risk-management policies of the fraternities and the way life is actually lived in countless dangerous chapters.

When there is a common denominator among hundreds of such injuries and deaths, one that exists across all kinds of campuses, from private to public, prestigious to obscure, then it is more than newsworthy: it begins to approach a national scandal.

When there is a common denominator among hundreds of such injuries and deaths, one that exists across all kinds of campuses, from private to public, prestigious to obscure, then it is more than newsworthy: it begins to approach a national scandal.

In all but a handful of instances, the shooter was male. Boys also accounted for more than 80 percent of the victims.

The Times sought to identify every accidental firearm death of a child age 14 and under in Georgia, Minnesota, North Carolina and Ohio dating to 1999, and in California to 2007. Records were also obtained from several county medical examiners’ offices in Florida, Illinois and Texas.

In four of the five states — California, Georgia, North Carolina and Ohio — The Times identified roughly twice as many accidental killings as were tallied in the corresponding federal data.

Another important aspect of firearm accidents is that a vast majority of victims do not die. Tracking these injuries nationally, however, is arguably just as problematic as tallying fatalities, according to public health researchers. In fact, national figures often cited from the Centers for Disease Control and Prevention’s Web site are an estimate, projected from a sampling taken from hospital emergency departments. Nevertheless, in 2011, the most recent year with available data, the agency estimated that there were 847 unintentional nonfatal firearm injuries among children 14 and under.

More concrete are actual counts of emergency department visits, which are available in a small number of states. In North Carolina, for instance, there were more than 120 such visits for nonfatal gun accidents among children 17 and under in 2010, the most recent year for which data is available.

While about 60 percent of the accidental firearm deaths identified by The Times involved handguns as opposed to long guns, that number was much higher — more than 85 percent — when the victims were very young, under the age of 6. In fact, the average handgun victim was several years younger than long gun victims: between 7 and 8, compared with almost 11.

Over all, the largest number of deaths came at the upper end of the age range, with ages 13 and 14 being most common — not necessarily surprising, given that parents generally allow adolescents greater access to guns. But the third-most common age was 3 (tied with 12), a particularly vulnerable age, when children are curious and old enough to manipulate a firearm but ignorant of the dangers.

About half of the accidents took place inside the child’s home. A third, however, occurred at the house of a friend or a relative, pointing to a potential vulnerability if safe-storage laws apply only to households with children, as in North Carolina.

Even in accidental shootings where criminals were in some way involved, they usually were not the ones pulling the trigger. Rather, they — like many law-abiding adults in these cases — simply left a gun unsecured.

In state after state and often with considerable success, gun rights groups have cited the federal numbers as proof that the problem is nearly inconsequential and that storage laws are unnecessary. Gun Owners of America says on its Web site that children are “130 percent more likely to die from choking on their dinner” than from accidental shootings.

Under the Centers for Disease Control and Prevention figures, in fact, gun accidents were the ninth-leading cause of unintentional deaths among children ages 1 to 14 in 2010. (The agency reported 62 such killings that year.) If the actual numbers are, in fact, roughly double, however, gun accidents would rise into the top five or six.

The rifle association and its allies also often note that studies on the impact of safe-storage laws have found mixed results. But those studies are based on the flawed government statistics. “When we’re evaluating child access laws, we’re using total trash data,

A safe-storage bill was introduced in the Ohio legislature in February, prompted by a shooting that killed three students at a high school in suburban Cleveland. But the measure, which would prohibit storing a firearm in a residence in a place readily accessible to a child, has encountered skepticism from the Republicans who control the legislature. “The tenor was, somebody breaks in, do I have time enough to get to my gun?” said State Representative Bill Patmon, a Democrat who introduced the bill.

The N.R.A. has long argued that better education is the key to preventing gun accidents, citing its Eddie Eagle GunSafe program, which teaches children as young as 3 that if they see a gun, they should “stop, don’t touch, leave the area and tell an adult.” The association, which did not respond to a request for comment, says its program has reached more than 26 million children in all 50 states and should be credited for the deep decline in accidental gun deaths shown in federal statistics dating to the mid-1980s.

Beyond the unreliability of the federal data, public health experts have disputed the N.R.A.’s claims, pointing to other potential explanations for the decline, including improvements in emergency medical care, along with data showing fewer households with firearms. They also highlight research indicating that admonishing children to stay away from guns is often ineffective.

As part of Dr. Kellermann’s study, researchers watched through a one-way mirror as pairs of boys ages 8 to 12 were left alone in an examination room at a clinic in Atlanta. Unknown to the children, an inoperative .38-caliber handgun was concealed in a cabinet drawer.

Playing and exploring over the next 15 minutes, one boy after another — three-quarters of the 64 children — found the gun. Two-thirds handled it, and one-third actually pulled the trigger. Just one child went to tell an adult about the gun, and he was teased by his peers for it. More than 90 percent of the boys said they had had some gun safety instruction.

Other research has found that simply having a firearm in the household is correlated with an increased risk of accidental shooting death. In one study, published in 2003 in the journal Accident Analysis and Prevention, the risk was more than three times as high for one gun, and almost four times as high for more than one.

requiring, or even encouraging, efforts to introduce “smart gun” technology remains unpopular with the gun lobby, which has worked to undermine such research and attempts to regulate firearms as a dangerous consumer product.

But Taurus backed out within a few months, citing competing priorities, and the project fell apart. Charles Vehlow, Metal Storm’s chief executive at the time, said that while he did not know exactly what pressures Taurus faced, there was a general wariness of smart-gun efforts among manufacturers and pro-gun groups. “There was no question that the N.R.A. was very sensitive and was aware of what we were doing,” he said.

The Colt’s Manufacturing Company and Smith & Wesson experienced a backlash against their own smart-gun programs, which were abandoned amid financial problems caused, in part, by boycotts from gun groups and others in the industry. So unpopular was the whole smart-gun concept that Colt’s Manufacturing later could not even find a buyer for its patents, said Carlton Chen, a former lawyer for the company.

Gun rights lobbyists have also helped keep firearms and ammunition beyond the reach of the Consumer Product Safety Commission, which has the power to regulate other products that are dangerous to children. The N.R.A. argues that the commission would provide a back door for gun control advocates to restrict the manufacture of firearms. Proponents of regulation say guns pose too great a hazard to exclude them from scrutiny.

German has its own share of wonderful, untranslatable words. One of those, “Zeitgenossen,” is particularly apt for the moment. If you look it up in a German-English dictionary, you will find that it means “contemporaries,” those who happen to live in the same day and age. But it means more than that. The German word “Genosse,” meaning “comrade” or “associate,” also implies a mutual responsibility.

The German statement characterized the troop movement as described by Mr. Putin as “the partial withdrawal of Russian troops ordered from the eastern border of Ukraine.”

The Kremlin’s statement describing the same telephone conversation made no mention of any troop withdrawals. It said only that the leaders “discussed various aspects of the situation in Ukraine, including the possibility for international involvement in restoring stability” and that the pair had also talked about constitutional overhaul in Ukraine and another troubled region of Eastern Europe, the separatist Transnistria region of Moldova.

Microsoft’s topological approach is generally perceived as the most high-risk by scientists, because the type of exotic anyon particle needed to generate qubits has not been definitively proved to exist.

Microsoft began supporting the effort after Dr. Freedman, who has won both the Fields Medal and a MacArthur Fellowship and is widely known for his work in the mathematical field of topology, approached Craig Mundie, one of Microsoft’s top executives, and convinced him there was a new path to quantum computing based on ideas in topology originally proposed in 1997 by the physicist Alexei Kitaev.

Mr. Mundie said the idea struck him as the kind of gamble the company should be pursuing.“It’s hard to find things that you could say, I know that’s a 20-year problem and would be worth doing,” he said. “But this one struck me as being in that category.”

For some time, many thought quantum computers were useful only for factoring huge numbers — good for N.S.A. code breakers but few others. But new algorithms for quantum machines have begun to emerge in areas as varied as searching large amounts of data or modeling drugs. Now many scientists believe that quantum computers could tackle new kinds of problems that have yet to be defined.

“It was just kind of sitting there, and I couldn’t believe no one had taken it on,” said Mr. Neri, author of six books for teenagers, including “Ghetto Cowboy.” “Both she and Truman used their real lives as fodder for their fiction, and I figured if they did it, maybe I could do it too.”

“Go Set a Watchman,” which takes place 20 years after “Mockingbird” when Scout is an adult, is punctuated by flashbacks to her childhood adventures with her brother, Jem, and her best friend, Dill, the Capote figure: “He was a short, square-built, cotton-headed individual with the face of an angel and the cunning of a stoat,” Ms. Lee wrote. “He was a year older than she, but she was a head taller.”

In one scene of “Watchman” that parallels an actual childhood incident, Dill, Scout and Jem put on a mock Baptist revival, culminating with a baptism in the fish pond. To their mortification, their antics are interrupted by dinner guests, the minister and his wife. In reality, Nelle, Truman and his cousin put on a mock carnival sideshow on a similar occasion, shocking the visitors, an episode woven into Mr. Neri’s book.

Born a year and a half apart, the young Harper and Truman both had active imaginations and distant mothers. Neither of them fit in especially well in a small Southern community.“Nelle was too rough for the girls, and Truman was scared of the boys, so he just tagged on to her and she was his protector,” a family friend, Charles Ray Skinner, recalled in “Mockingbird,” Charles J. Shields’s biography of Ms. Lee. When schoolyard bullies ganged up on Truman, who was small for his age, Nelle, who was younger, got in fistfights to protect him.

Ms. Lee, who stopped giving formal interviews in the 1960s, once described feeling bound to Mr. Capote by “a common anguish” and said of her childhood, “We lived in our imagination most of the time.” Mr. Capote recalled in an interview that the two often felt like “apart people.”

the survey provided a strong foundation for the view that cooperative behavior, as distinct from the fierce aggression between chimp groups, was the turning point that shaped human evolution.

Anthropologists have assumed until now that hunter-gatherer bands consist of people fairly closely related to one another, much as chimpanzee groups do, and that kinship is a main motive for cooperation within the group. Natural selection, which usually promotes only selfish behavior, can reward this kind of cooperative behavior, called kin selection, because relatives contain many of the same genes.

On a genetic level, the finding that members of a band are not highly interrelated means that “inclusive fitness cannot explain extensive cooperation in hunter-gatherer bands,” the researchers write. Some evolutionary biologists believe that natural selection can favor groups of people, not just individuals, but the idea is hotly disputed.

hunter-gatherers probably lived as tribes split into many small bands of 30 or so people. Group selection could possibly act at the level of the tribe, Dr. Hill said, meaning that tribes with highly cooperative members would prevail over those that were less cohesive, thus promoting genes for cooperation.

A male chimp may know in his lifetime just 12 other males, all from his own group. But a hunter-gatherer, because of cooperation between bands, may interact with a thousand individuals in his tribe. Because humans are unusually adept at social learning, including copying useful activities from others, a large social network is particularly effective at spreading and accumulating knowledge.

Recognition of relatives promoted cooperation between neighboring bands, in his view, allowing people to move freely from one to another. Both sons and daughters could disperse from the home group, unlike chimp society, where only females can disperse. But this cooperation did not mean that everything was peaceful. The bands were just components of tribes, between which warfare may have been intense.

What appears to be the case, to anyone with open eyes, is that humankind is mildly monogamous and more than mildly hypocritical about it all.

Some of their pain comes from abroad. Brazil’s main trading partners are slowing (China), stagnant (the euro area) or tanking (Argentina). Not only are export volumes down; the prices of things Brazil sells—iron ore, petroleum, sugar and soyabeans—are dropping as global demand falters.

But Brazil and Russia’s problems have domestic roots too. Since the 1990s Brazil has tended to aim for a primary surplus (before interest payments) of close to 3% of GDP—enough to begin reducing its debts. But Dilma Rousseff, the newly re-elected president, has played havoc with Brazil’s public finances. In 2014 spending has expanded at twice the rate of revenues despite one-off gains from the sale of Libra, an oilfield, and the 4G telecoms spectrum. Brazil’s debt-to-GDP ratio is rising fast.

There could be worse to come. The drop in commodity prices looks set to last. Meanwhile, in order to crimp inflation and stem the slide in their currencies the central banks in both countries raised their rates last month: they stand at 11.25% in Brazil and 9.5% in Russia. At the same time, worried finance ministries are keen to bolster their books. In Brazil, fuel-tax hikes are being mooted, and tax breaks on car purchases may be scrapped.

This frugality will hurt. Banks could prove vulnerable as public-sector spending cuts hit incomes and high interest rates make loans hard to service.

Even optimists think the pair will be lucky to grow in 2015. Pessimists see tumbling currencies, bond-market routs and even bank runs.

The United States has one of the world’s largest pay gaps, with chief executives earning nearly 300 times what the average worker makes, according to some economists’ estimates. That is much higher than the 20-to-1 ratio recommended by Gilded Age magnates like J. Pierpont Morgan and the 20th century management visionary Peter Drucker.

“The market rate for me as a C.E.O. compared to a regular person is ridiculous, it’s absurd,” said Mr. Price, who said his main extravagances were snowboarding and picking up the bar bill. He drives a 12-year-old Audi

Mr. Price, who started the Seattle-based credit-card payment processing firm in 2004 at the age of 19, said he would pay for the wage increases by cutting his own salary from nearly $1 million to $70,000 and using 75 to 80 percent of the company’s anticipated $2.2 million in profit this year.

Of all the social issues that he felt he was in a position to do something about as a business leader, “that one seemed like a more worthy issue to go after.”

The happiness research behind Mr. Price’s announcement on Monday came from Angus Deaton and Daniel Kahneman, a Nobel Prize-winning psychologist. They found that what they called emotional well-being — defined as “the emotional quality of an individual’s everyday experience, the frequency and intensity of experiences of joy, stress, sadness, anger, and affection that make one’s life pleasant or unpleasant” — rises with income, but only to a point. And that point turns out to be about $75,000 a year.

Of course, money above that level brings pleasures — there’s no denying the delights of a Caribbean cruise or a pair of diamond earrings — but no further gains on the emotional well-being scale.

As Mr. Kahneman has explained it, income above the threshold doesn’t buy happiness, but a lack of money can deprive you of it.

2. Multiple Soft Targets: The unifying thread in Paris was that all were soft targets and did not appear to hold special significance for the terrorists.

France is among many countries with large, disgruntled Muslim populations

4. U.S. Has Mostly Been Spared:

There's no indication that the migrant influx has led to terror attacks. But the huge flow has shown that there's no real obstacle to moving across borders.

Muslims in the U.S., both those born in America and those who have immigrated, tend to be more successful, better integrated, and have turned to radicalism less often than Muslims in Europe and elsewhere.

5. Racking Up Powerful Enemies: The Islamic State has rapidly accumulated sworn enemies far beyond the borders of Iraq and Syria, and the combined forces lining up against ISIS will put increasing pressure on the group.

France and Russia are now bombing in Syria.

The Islamic State has not suffered any major setbacks since its dramatic rise, and its many opponents have not acted in a coordinated manner.

As French authorities worked to piece together the details Saturday, here are five ways to think about the terror attacks that claimed more than 120 lives in Paris.

Beyond The Middle East: Until very recently, ISIS fought and carried out attacks almost exclusively in Syria and Iraq. But the group has now claimed responsibility or been blamed for major terror attacks in four additional countries in the past month.

suicide bombing that killed more than 100 people at an Oct. 10 rally in Ankara, the worst terror attack in the country's modern history

Defence lawyers said the pair had given false confessions under torture in close-door interrogations, an allegation denied by Prime Minister Benjamin Netanyahu and the Shin Bet security agency.

"I doubt such confessions will stand up in court," lawyer Hai Haber told reporters. "We know there's no significant external evidence linking the suspects to this incident."

The attack in Duma village and ensuing Israeli investigation laid bare fissures in Netanyahu's coalition government, where one ultra-nationalist partner voiced misgivings about the handling of Jewish suspects.Thirteen other Israeli Jews, most of them minors, were also indicted for hate crimes, including assaulting a Palestinian, vandalism of Arab property and setting fire to a church.

Referred to in Israel as "price-tag attacks", such offences have usually been carried out in what the attackers say are reprisals for Palestinian violence against Israelis or government curbs on unauthorized West Bank settlement building.

Saad Dawabsheh's brother Naser said he hoped the defendants would receive the maximum penalty, but was skeptical of Israel's seriousness in prosecuting the case."We have no trust in the Israeli judiciary. They would not have launched an investigation were it not for the international pressure on them," he said, accusing the government of effectively "support(ing) the terrorism conducted by (West Bank) settlers against our people".

The time it has taken Israel to crack down on the Jewish militants, compared to the speedy and sometimes lethal response by state security forces to similar actions by Arabs, has angered Palestinians, contributing to a wave of stabbings, car-rammings and shooting attacks against Israelis since Oct. 1.

Twenty-one Israelis and a U.S. citizen have died in the latest bloodshed, a number that will rise if police deem a Tel Aviv shooting that killed two people on Friday as a pro-Palestinian attack. The gunman, an Israeli Arab, is at large. Israeli forces or armed civilians have killed at least 132 Palestinians, 82 of whom authorities described as assailants. Most of the others were killed in clashes with security forces.

Israeli officials said their investigation into the attacks by far-right Jews were hampered by the suspects' operating in small, tight-knit cells and eluding electronic surveillance.Netanyau said the indictments demonstrated the rule of law in Israel, telling his cabinet in broadcast remarks: "We oppose murder of all kinds. We oppose violence of all kinds."

It seems to me to make more sense to target solutions than scapegoats, but sense is often in short supply in politics.

The rise of inequality has complex roots, and some aren’t easily solved. For example, the empowerment of women, coupled with the tendency of people to marry those like themselves, means that high-earning men increasingly pair with high-earning women to form super-high-earning families.

So American voters are right to feel angry. Yet the challenge is not just to diagnose the problem but also to prescribe the right fixes and achieve them in this political environment.

So may the insurrection gain ground but be channeled not by punishing scapegoats, but by pursuing reforms that make the system work better for ordinary Americans.

He's not a joke and he's not a clown. He's a man who could soon be making decisions of war and peace, who would decide which regulations are enforced and which are lifted, who would be responsible for nominating Supreme Court justices and representing America in the community of nations.

He climbed to the top of the polls in this election by calling Mexicans rapists and killers. He defended a poor debate performance by accusing Megyn Kelly of being on her period. He responded to rival Ted Cruz's surge by calling for a travel ban on Muslims. When two of his supporters attacked a homeless man and said they did it because "Donald Trump was right, all these illegals need to be deported," he brushed off complaints that he's inspiring violence by saying his supporters are "very passionate."

Behind Trump's success is an unerring instinct for harnessing anger, resentment, and fear.

"All the other candidates say 'Americans are angry, and I understand.' Trump says, 'I’M angry.'" Trump doesn't offer solutions so much as he offers villains. His message isn't so much that he'll help you as he'll hurt them.

Trump doesn't. He has the reality television star's ability to operate entirely without shame, and that permits him to operate entirely without restraint. It is the single scariest facet of his personality. It is the one that allows him to go where others won't, to say what others can't, to do what others wouldn't.

When MSNBC's Joe Scarborough asked Trump about his affection for Vladimir Putin, who "kills journalists, political opponents and invades countries," Trump replied, "He's running his country, and at least he's a leader, unlike what we have in this country."

It's a lie that if you put a frog into a pot of water and slowly turn up the heat the frog will simply boil, but it's a fact that if you put the American political system in a room with Trump for long enough we slowly lose track of how noxious he is, or we at least run out of ways to keep repeating it.

There is something scary in Donald Trump. We should fear his rise.

. That January, after a pair of terrorist attacks in Paris, pundits and conservative officials propagated a discredited myth about Shariah-run zones in European cities off limits to non-Muslims.

Hashtags like #KillAllMuslims trended on Twitter. A month later, three Muslim youths were shot dead in their North Carolina apartment in what many people said was a hate crime.

An examination of anti-Muslim hatred in the last few years can easily devolve into a laundry list: armed demonstrators picketing at a mosque in Phoenix

Ben Carson compared Syrian refugees to “rabid” dogs. Ted Cruz called for allowing only Christian refugees to enter the United States. And Donald J. Trump, whose statements on Islam seem to be read directly off paranoid chain emails, first stated that American Muslims celebrated the horror of the Sept. 11 attacks (a discredited falsehood), then, after the San Bernardino, Calif., shootin

all Muslims should be barred from entering the United States

At a news conference, Hazem Bata, the Islamic Society’s secretary general, said: “I’m not here to focus on the negative, because once you start focusing on the negative, you start to take on a victim’s mentality. And as Muslims in America, we refuse to be victims in our own country.

e is a fine line between stoic resilience and irresponsible passivity. Muslims in America face a growing threat