Ticket rush: Film fans hand Hollywood record cash

LOS ANGELES (AP) — The big deal for Hollywood is not the record $ 10.8 billion that studios took in domestically in 2012. It’s the fact that the number of tickets sold went up for the first time in three years.

Thanks to inflation, revenue generally rises in Hollywood as admission prices climb each year. The real story is told in tickets, whose sales have been on a general decline for a decade, bottoming out in 2011 at 1.29 billion, their lowest level since 1995.

The industry rebounded this year, with ticket sales projected to rise 5.6 percent to 1.36 billion by Dec. 31, according to box-office tracker Hollywood.com. That’s still well below the modern peak of 1.6 billion tickets sold in 2002, but in an age of cozy home theater setups and endless entertainment gadgets, studio executives consider it a triumph that they were able to put more butts in cinema seats this year than last.

“It is a victory, ultimately,” said Don Harris, head of distribution at Paramount Pictures. “If we deliver the product as an industry that people want, they will want to get out there. Even though you can sit at home and watch something on your large screen in high-def, people want to get out.”

Domestic revenue should finish up nearly 6 percent from 2011′s $ 10.2 billion and top Hollywood‘s previous high of $ 10.6 billion set in 2009.

The year was led by a pair of superhero sagas, Disney’s “The Avengers” with $ 623 million domestically and $ 1.5 billion worldwide and the Warner Bros. Batman finale “The Dark Knight Rises” with $ 448 million domestically and $ 1.1 billion worldwide. Sony’s James Bond adventure “Skyfall” is closing in on the $ 1 billion mark globally, and the list of action and family-film blockbusters includes “The Hunger Games,” ”The Twilight Saga: Breaking Dawn — Part Two,” ”Ice Age: Continental Drift,” ”Madagascar 3: Europe’s Most Wanted,” ”The Amazing Spider-Man” and “Brave.”

Before television, movies were the biggest thing going, with ticket sales estimated as high as 4 billion a year domestically in the 1930s and ’40s.

Movie-going eroded steadily through the 1970s as people stayed home with their small screens. The rise of videotape in the 1980s further cut into business, followed by DVDs in the ’90s and big, cheap flat-screen TVs in recent years. Today’s video games, mobile phones and other portable devices also offer easy options to tramping out to a movie theater.

It’s all been a continual drain on cinema business, and cynics repeatedly predict the eventual demise of movie theaters. Yet Hollywood fights back with new technology of its own, from digital 3-D to booming surround-sound to the clarity of images projected at high-frame rates, which is being tested now with “The Lord of the Rings” prelude “The Hobbit: An Unexpected Journey,” shown in select theaters at 48 frames a second, double the standard speed.

For all of the annoyances of theaters — parking, pricy concessions, sitting next to strangers texting on their iPhones — cinemas still offer the biggest and best way to see a movie.

“Every home has a kitchen, but you can’t get into a good restaurant on Saturday night,” said Dan Fellman, head of distribution for Warner Bros. “People want to escape. That’s the nature of society. The adult population just is not going to sit home seven days a week, even though they have technology in their home that’s certainly an improvement over what it was 10 years ago. People want to get out of the house, and no matter what they throw in the face of theatrical exhibition, it continues to perform at a strong level.”

Even real-life violence at the movie theater didn’t turn audiences away. Some moviegoers thought twice about heading to the cinema after a gunman killed 12 people and injured 58 at a screening of “The Dark Knight Rises” in Colorado last summer, but if there was any lull in attendance, it was slight and temporary. Ticket sales went on a tear for most of the fall.

While domestic revenues inch upward most years largely because of inflation, the real growth areas have been overseas, where more and more fans are eager for the next Hollywood blockbuster.

Rentrak, which compiles international box office data, expects 2012′s foreign gross to be about $ 23 billion, 3 percent higher than in 2011. No data was yet available on the number of tickets sold overseas this past year.

International business generally used to account for less than half of a studio film’s overall receipts. Films now often do two or even three times as much business overseas as they do domestically. Some movies that were duds with U.S. audiences, such as “Battleship” and “John Carter,” can wind up being $ 200 million hits with overseas crowds.

Whether finishing a good year or a bad one, Hollywood executives always look ahead to better days, insisting that the next crop of blockbusters will be bigger than ever. The same goes this time as studio bosses hype their 2013 lineup, which includes the latest “Iron Man,” ”Star Trek,” ”Hunger Games” and “Thor” installments, the Superman tale “Man of Steel” and the second chapter in “The Hobbit” trilogy.

Twelve months from now, they hope to be talking about another revenue record topping this year’s $ 10.8 billion.

“I’ve been saying we’re going to hit that $ 11 billion level for about three years now,” said Paul Dergarabedian, a box-office analyst for Hollywood.com. “Next year I think is the year we actually do it.”

___

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Study Finds Modest Declines in Obesity Rates Among Young Children From Poor Families

A new national study has found modest declines in obesity among 2- to 4-year-olds from poor families, a dip that researchers say may indicate that the obesity epidemic has passed its peak among this group.

The study, by researchers from the Centers for Disease Control and Prevention, drew on the height and weight measurements of 27 million children who were part of the federal Women, Infants and Children program, which provides food subsidies to low-income mothers and their children up to the age of 5.

The study was based on data from 30 states and the District of Columbia and covered the years from 1998 to 2010. The share of children who were obese declined to 14.9 percent in 2010, down from 15.2 percent in 2003, after rising between 1998 and 2003. Extreme obesity also declined, dropping to 2.07 percent in 2010 from 2.22 percent in 2003. The study was published Tuesday in The Journal of the American Medical Association.

The report defined a 3-year-old boy of average height, almost 3 feet 2 inches tall, as being obese when he weighed 37 pounds or more. The same boy was categorized as being extremely obese when he weighed 44 pounds or more.

“The declines we’re presenting here are pretty modest, but it is a change in direction,” said Heidi M. Blanck, one of the study’s authors and the acting director of the Division of Nutrition, Physical Activity and Obesity at the disease centers. “We were going up before. And this data shows we’re going down. For us, that’s pretty exciting.”

The findings were another sign that one of the nation’s seemingly intractable health problems may be reversing course, at least among children. Single interventions like school exercise programs have not worked, and public health experts now say that only a broad set of policy measures has a chance of success.

Over the past year, several major cities, including Los Angeles, New York and Philadelphia, have reported obesity declines among some parts of their student populations.

The new study was one of the first to document a national decline in obesity among young children from low-income families. Researchers say that is particularly meaningful in a population that is disproportionately at risk. Twenty percent of poor children are obese, compared with about 12 percent of children from more affluent families, according to the centers.

It is unclear what drove the decline, but Dr. Blanck offered hypotheses. Breast-feeding, which often leads to healthier weight gain for young children, has increased since 2000. The percentage of 6-month-olds still being breast-fed increased to 47.7 percent among children born in 2009, up from 34.2 percent among children born in 2000.

Breast-feeding of infants from low-income families has risen over the years. In 1980, only 28 percent of infants from those families had ever been breast-fed, compared with 66 percent in 2011.

Dr. Blanck also pointed to changes in the environment, like those documented in a report about food marketing practices released by the Federal Trade Commission on Friday.

The agency found that the amount of money spent on food marketing to children declined by nearly 20 percent from 2006 to 2009, with the biggest drop in television advertising. The total spent on food advertising to youths in 2009 was $1.79 billion, the report said.

The report, based on data from 48 major food and beverage marketers, also found that cereals marketed to children ages 2 to 11 had about a gram less sugar per serving in 2009 than in 2006 and slightly more whole grain.

Marketing to children of the most sugary cereals — those with 13 grams or more sugar per serving — was virtually eliminated between 2006 and 2009, according to the report.

But drinks marketed to children still averaged more than 20 grams of added sugar per serving, the report found. Most of the improvements in beverages in the time period were in those sold in schools, the report said.

Dr. Blanck said she was hopeful that several national programs begun in the past few years would help extend the early declines. One initiative, Let’s Move! Child Care, initiated by Michelle Obama’s office, helps child care centers serve healthier food and include physical activity throughout day.

Changes in the foods that are subsidized in the Women, Infants and Children program, like less financing for fruit juice and more for fruits and vegetables, may also help, she said.

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Corporate tax rate overhaul may be part of a 'fiscal cliff' deal

WASHINGTON — Amid the wrangling over the so-called fiscal cliff, President Obama and congressional Republicans can agree on something: They want to lower the corporate tax rate.

The U.S. has the highest overall rate of any of the world's developed economies. It took the top spot in March after Japan reduced its rate, mimicking other countries that have lowered taxes to lure new businesses and keep existing companies from leaving.

Negotiations to avert automatic income tax increases and federal spending cuts scheduled to kick in Jan. 1 could provide the impetus for U.S. policymakers to tackle an overhaul of the corporate tax code next year.

The White House wants to put a corporate tax overhaul, along with changes to the individual income tax system, on a fast track as part of any deal to avoid the "fiscal cliff."

The centerpiece of an overhaul would be slashing the 35% corporate tax rate, a goal long sought by corporate executives and lobbyists.

Quiz: How much do you know about the 'fiscal cliff'?

"In the name of global competitiveness, I think that has largely been agreed to," Jim McNerney, chief executive of Boeing Co., said about how both parties view the need for major corporate tax changes.

In February, Obama proposed lowering the federal rate to 25% for manufacturing companies and to 28% for other firms. Rep. Dave Camp (R-Mich.), chairman of the House Ways and Means Committee, has been pushing a plan to lower the rate to 25% for all corporations.

In both cases, the rate cuts would be accompanied by the elimination of some of the numerous tax breaks that allow many companies to pay a much lower effective tax rate — and sometimes to avoid paying any corporate taxes at all.

"The administration's position on this is very much in sync with what Republicans say they want, which is a lower rate and a broader base," said Jared Bernstein, a senior fellow at the Center on Budget and Policy Priorities and the former chief economist for Vice President Joe Biden.

But there still are some obstacles to a deal.

Some Democrats want to use an overhaul to increase the amount of tax revenue coming from corporations, while Republicans want to keep the amount the same. The White House and congressional Republicans also differ on how the U.S. should treat money earned abroad.

And the business community itself is divided. Many small companies file taxes as individuals. They're opposed to any "fiscal cliff" deal that would raise their rates while giving corporations a rate reduction.

Analysts said the obstacles could be overcome because there is consensus around the broader point that the U.S. needs to bring its corporate tax rate in line with other developed nations.

"Regardless of your political persuasion, it is unquestionably the case that the nominal U.S. corporate tax rate is much higher than that of peer countries," said Edward Kleinbard, a USC law professor and former chief of staff of Congress' Joint Committee on Taxation.

The case for corporate tax reform got a boost when the overall U.S. rate of 39.1%, which includes federal, state and local corporate taxes, became the highest this year among the 34 nations in the Organization for Economic Cooperation and Development. Two decades ago, the U.S. was 13th.

"At one time in the '80s, we had a competitive corporate tax rate," said Dorothy Coleman, vice president of tax and domestic economic policy for the National Assn. of Manufacturers. "We've fallen behind by standing still."

Quiz: The year in business

But the rate in the tax code isn't what many companies pay because of a host of deductions and tax credits. In 2011, the effective corporate tax rate in the U.S. was 29.2%, roughly in line with the 31.9% average of the six other largest developed economies, the Obama administration said.

The White House said that parity does not mean the statutory rate shouldn't be reduced. It simply means that many tax breaks should be eliminated, allowing the rate to be lowered without adding to the deficit.

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10 Talented Dogs Playing the Piano

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Queen delivers 1st Christmas message in 3D

LONDON (AP) — Queen Elizabeth II has hailed the holidays in a new dimension, delivering her Christmas message for the first time in 3D.

In the annual, prerecorded broadcast, the monarch paid tribute to the armed forces, “whose sense of duty takes them away from family and friends” over the holidays, and expressed gratitude for the outpouring of enthusiasm for her Diamond Jubilee celebrations.

The queen said she was struck by the “strength of fellowship and friendship” shown by well-wishers to mark her 60 years on the throne.

“It was humbling that so many chose to mark the anniversary of a duty which passed to me 60 years ago,” she said as footage showed crowds lining the Thames River in the rain earlier this year for a boat pageant. “People of all ages took the trouble to take part in various ways and in many nations.”

The queen also reflected on Britain’s hosting of the Olympic games in 2012, praising the “skill, dedication, training and teamwork of our athletes” and singling out the volunteers who devoted themselves “to keeping others safe, supported and comforted.”

Elizabeth’s message aired shortly after she attended a traditional church service at St. Mary Magdelene Church on her sprawling Sandringham estate in Norfolk.

Wearing a turquoise coat and matching hat, the monarch rode to church in a Bentley, accompanied by granddaughters Beatrice and Eugenie. Her husband, Prince Philip, walked from the house to the church with other members of the royal family.

Three familiar faces were missing from the family outing. Prince William is spending the holiday with his pregnant wife Kate and his in-laws in the southern England village of Bucklebury. Prince Harry is serving with British troops in Afghanistan.

After the church service, the royals usually gather to watch the queen’s prerecorded television broadcast, a tradition that began with a radio address by King George V in 1932.

The queen has made a prerecorded Christmas broadcast on radio since 1952 and on television since 1957. She writes the speeches herself and the broadcasts mark the rare occasion on which the queen voices her own opinion without government consultation.

Her switch to 3D was not the only technological leap for prominent British figures this Christmas.

The Archbishops of Canterbury and York chose to tweet their sermons for the first time, in order to bring Christmas to a new digital audience.

In his speech, Archbishop of Canterbury Rowan Williams said he has been inspired by meeting victims of suffering over the past decade while leading the world’s 80 million-strong Anglican Communion.

Delivering his final Christmas Day sermon from Canterbury Cathedral, Williams also acknowledged how a vote against allowing women to become bishops has damaged the credibility of the church.

Still, he said, it was “startling” to see after the vote how many people “turned out to have a sort of investment in the church, a desire to see the church looking credible and a real sense of loss when — as they saw it — the church failed to sort its business out.”

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Rumored iPad 5 to be thinner

By Chris O'Brien

1:03 p.m. CST, December 24, 2012

That iPad 3 you got last March? Forget it. It's like the eight-track tape  of tablets. (Kids: Ask your parents what that means.) Even that iPad 4 you're about to unwrap Christmas morning that you think is so darn new is about to become yesterday's news. 

At least, that is, if the latest iPad rumors are true. According to the Japanese blog Macotakara, the next iPad is due to hit in March. At which time, all previous versions of the iPad will feel like bricks.

QUIZ: What set the Internet on fire in 2012? 

The site reports that the fifth version of the iPad will be thinner and lighter than the last iPad. For those of you hoping that Apple's next version of the iPad would be heavier and clunkier, this is no doubt crushing news.

For the rest of the planet, however, this is pretty much what you'd expect from Apple. Macotakara says its sources say the next iPad will be 2 millimeters thinner and 17 millimeters narrower. 

If true, it marks a continuation of the accelerated product update cycle that kicked into gear this past year under Apple CEO Tim Cook. 

According to 9to5Mac.com, if the dimensions are correct, "The new supposed thinness would mean the next iPad is nearly as thin as the 7.2mm thin iPad mini."

Speaking of the Mini, Macotakara reports that Apple is cooking up a retina screen for the next iPad mini. 

Here's the real thing iPad owners need to fear: How long will Apple continue to support those older iPads? It already doesn't let owners of the first iPad download new versions of iOS. 

ALSO: 

Yelp's new weapon against fake reviews: User alerts

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Follow me on Twitter @obrien.

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2 firefighters fatally shot in ambush at blazing NY house

WEBSTER, N.Y. -- A gunman ambushed four volunteer firefighters responding to an intense pre-dawn house fire Monday morning outside Rochester, N.Y., killing two before ending up dead himself, authorities said. Police used an armored vehicle to evacuate more than 30 nearby residents.

The gunman fired at the firefighters when they arrived shortly after 5:30 a.m. at the blaze near the Lake Ontario shore in Webster, town Police Chief Gerald Pickering said. The first Webster police officer who arrived chased the suspect and exchanged gunfire with him, authorities said.

“It does appear it was a trap” for the first responders to the fire, Pickering said at a news conference.

Authorities didn't say how the gunman died or whether anyone might have died in the fire itself.

One of the dead firefighters was also a town police lieutenant; it wasn't clear whether he returned fire. An off-duty police officer who was driving by was injured by shrapnel, Pickering said.

The fire started in one home and spread to two others and a car, officials said. The gunfire initially kept firefighters from battling the blazes. Police say four homes were destroyed and four damaged.

The West Webster Fire District learned of the fire early Monday after a report of a car and house on fire on Lake Road, on a narrow peninsula where Irondequoit Bay meets Lake Ontario, Monroe County Sheriff Patrick O'Flynn said.

The fire appeared from a distance as a pulsating ball of flame glowing against the early morning sky, flames licking into treetops and reflecting on the water, with huge bursts of smoke billowing away in a brisk wind.

Two of the firefighters arrived on a fire engine and two in their own vehicles, Pickering said. After the gunman fired, one of the wounded men managed to flee, but the other three couldn't because of flying gunfire.

A police armored vehicle was used to recover two of the men, and eventually it evacuated 33 people from nearby homes, the police chief said.

The dead men were identified as Police Lt. Michael Chiapperini, 43, the Webster Police Department's public information officer; and Tomasz Kaczowka, also a 911 dispatcher, whose age was not released.

Pickering described Chiapperini as a “lifetime firefighter” with nearly 20 years with the department, and called Kaczowka a “tremendous young man.”

The two wounded firefighters, Joseph Hofsetter and Theodore Scardino, were in guarded condition in the intensive care unit at Strong Memorial Hospital, authorities said. Both were awake and alert and are expected to recover.

Hofsetter, also a full-timer with the Rochester Fire Department, was hit once in the pelvis, and the bullet lodged in his spine, authorities said. Scardino was hit in the chest and knee.

Monday's shooting and fires were in a neighborhood of seasonal and year-round homes set close together across the road from the lakeshore. The area is popular with recreational boaters but is normally quiet this time of year.

“We have very few calls for service in that location,” Pickering said. “Webster is a tremendous community. We are a safe community, and to have a tragedy befall us like this is just horrendous.”

O'Flynn lamented the violence, which comes on the heels of other shootings including the massacre of 20 students and six adults at Sandy Hook Elementary School in Newtown, Conn.

“It's sad to see that that this is becoming more commonplace in communities across the nation,” O'Flynn said.

Webster, a middle-class suburb, now is the scene of violence linked to house fires for two Decembers in a row.

Last Dec. 7, authorities say, a 15-year-old boy doused his home with gasoline and set it ablaze, killing his father and two brothers, 16 and 12. His mother and 13-year-old sister escaped with injuries. He is being prosecuted as an adult.

Associated Press and Reuters contributed

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Fifth-gen iPad reportedly due in March along with Retina iPad mini

Rumors that a second-generation iPad mini with a Retina display is set to launch ahead of Apple’s typical annual schedule next year have been swirling, and now it appears Apple’s (AAPL) full-size iPad may be sticking to its new semiannual release schedule. According to a report from Japanese blog Makotakra that cites an anonymous “inside source,” Apple plans to launch a new thinner, lighter 9.7-inch iPad as soon as March 2013. The fourth iPad model was just released last month alongside the iPad mini, but March was also suggested in recent Retina iPad mini rumors. Makotakra states that the new iPad will adopt styling queues from the current iPad mini model, unifying the look of Apple’s larger tablet with the iPad mini and iPhone 5.

[More from BGR: First photos of BlackBerry 10 ‘N-Series’ QWERTY smartphone leak]

This article was originally published by BGR

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Britain’s Queen Elizabeth goes 3D for Olympics tribute

LONDON (Reuters) – Britain‘s Queen Elizabeth will use her traditional Christmas Day message, filmed in 3D for the first time, to pay tribute to the world’s athletes for delivering a “splendid summer of sport” at the London Olympics.

In her personal address to the nation, the monarch will pay tribute to the competitors’ “skill, dedication, training and teamwork”, her office said on Monday.

The 86-year-old head of state provided an Olympic highlight when she made a surprise comic turn with James Bond actor Daniel Craig in a short film for the opening ceremony.

“In pursuing their own sporting goals, they gave the rest of us the opportunity to share something of the excitement and drama,” she will say, according to advance extracts.

Queen Elizabeth missed a church service at her country retreat on Sunday due to a cold, Buckingham Palace said. Her message was pre-recorded and will go out as expected.

It comes at the end of a landmark year for the royal family.

Queen Elizabeth marked 60 years on the throne with the Diamond Jubilee celebrations and her grandson Prince William and his wife Kate are expecting their first baby.

Prime Minister David Cameron issued his own Christmas message in which he talked of Britain’s “extraordinary year”.

“We cheered our queen to the rafters with the Jubilee, showed the world what we’re made of by staging the most spectacular Olympic and Paralympic Games ever and – let’s not forget – punched way above our weight in the medals table,” he said.

The first Christmas broadcast was given by Queen Elizabeth’s grandfather George V in 1932. It has become a Christmas Day tradition for many families to watch it together after lunch.

(Reporting by Peter Griffiths; Editing by Stephen Powell)

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News Analysis: Scientists to Seek Clues to Violence in Genome of Gunman in Newtown, Conn.

In a move likely to renew a longstanding ethical controversy, geneticists are quietly making plans to study the DNA of Adam Lanza, 20, who killed 20 children and seven adults in Newtown, Conn. Their work will be an effort to discover biological clues to extreme violence.

The researchers, at the University of Connecticut, confirmed their plans through a spokeswoman but declined to provide details. But other experts speculated that the geneticists might look for mutations that might be associated with mental illnesses and ones that might also increase the risk for violence.

They could look at all of Mr. Lanza’s genes, searching for something unusual like gene duplications or deletions or unexpected mutations, or they might determine the sequence of his entire genome, the genes and the vast regions of DNA that are not genes, in an extended search for aberrations that could determine which genes are active and how active they are.

But whatever they do, this apparently is the first time researchers will attempt a detailed study of the DNA of a mass killer.

Some researchers, like Dr. Arthur Beaudet, a professor at the Baylor College of Medicine and the chairman of its department of molecular and human genetics, applaud the effort. He believes that the acts committed by men like Mr. Lanza and the gunmen in other rampages in recent years — at Columbine High School and in Aurora, Colo., in Norway, in Tucson and at Virginia Tech — are so far off the charts of normal behavior that there must be genetic changes driving them.

“We can’t afford not to do this research,” Dr. Beaudet said.

Other scientists are not so sure. They worry that this research could eventually stigmatize people who have never committed a crime but who turn out to have a genetic aberration also found in a mass murder.

Everything known about mental illness, these skeptics say, argues that there are likely to be hundreds of genes involved in extreme violent behavior, not to mention a variety of environmental influences, and that all of these factors can interact in complex and unpredictable ways.

“It is almost inconceivable that there is a common genetic factor” to be found in mass murders, said Dr. Robert C. Green, a geneticist and neurologist at Harvard Medical School. “I think it says more about us that we wish there was something like this. We wish there was an explanation.”

Scientists are well aware of the fraught history behind the questions of biology and violence.

In the early 20th century, claims that criminal behavior was inherited arose during the eugenics movement and led to sterilizations of mental patients and felons.

On Christmas Day in 1965, two researchers published a paper saying men with an extra Y chromosome, the chromosome that confers maleness, were “super males” and born criminals. The hypothesis was helped along by the fact that these men “fit the classic Hollywood criminal — big, awkward, thuglike and with low I.Q.’s,” said Dr. Philip Reilly, a lawyer and clinical geneticist who has studied this history.

The idea persisted for about 15 years, Dr. Reilly said, but eventually the epidemiological evidence convinced scientists that these men were no more violent than men without an extra Y chromosome.

In 1993, in a paper published in the journal Science, researchers reported that a mutation leading to a lack of the enzyme monoamine oxidase caused violence in a Dutch family. Every family member who inherited the mutation was a violent criminal; those without it had no criminal behaviors.

“It was a stunning piece of work,” said James Blair, the chief of the unit on affective cognitive neuroscience at the National Institute of Mental Health. But, he added, it turned out not to be generalizable. For the most part, “it was just this family,” he said.

The National Institutes of Health was embroiled in controversy about 20 years ago simply for proposing to study the biological underpinnings of violence. Critics accused researchers of racism and singling out minorities, especially black men.

Shortly after, the N.I.H. took back financing for a conference at the University of Maryland to examine genetics and criminal behavior. The conference was canceled.

But genetics has come of age in recent years with new and powerful methods to determine DNA sequences and analyze the results. Studies of people at the far end of a bell curve can be especially informative, because the genetic roots of their conditions can be stark and easy to spot, noted J. H. Pate Skene, a Duke University neurobiologist.

“I think doing research on outliers, people at an end of a spectrum on something of concern like violent behavior, is certainly a good idea,” he said, but he advised tempering expectations.

“I would call it a caution, not about whether to do this research but about what to expect,” he added.

Perhaps it will be fruitless to search for one or a few major gene mutations that always lead to extreme violence, Dr. Beaudet said. But what if a significant fraction of the shootings were linked to gene variants? What if scientists were to discover genes that were risk factors, increasing a person’s chance of violent behavior but not foreordaining it?

“If we know someone has a 2 percent chance or a 10 percent chance or a 20 percent chance of violent behavior, what would you do with that person?” Dr. Skene said. “They have not been convicted of anything — have not done anything wrong.”

But a genetic profile might play a role if someone were convicted of violent offenses, Dr. Beaudet countered. Criminals are routinely denied parole based solely on psychiatric evaluations. Perhaps a genetic test could add to the certainty of the decision, he said.

Ultimately, understanding the genetics of violence might enable researchers to find ways to intervene before a person commits a horrific crime. But that goal would be difficult to achieve, and the pursuit of it risks jeopardizing personal liberties. Some scientists shudder at the thought of labeling people potential violent criminals.

“The idea of screening with a view of preventing those kinds of incidents is basically unthinkable,” said Dr. Steven E. Hyman, director of the Stanley Center for Psychiatric Research at the Broad Institute of Harvard and M.I.T. “You would fail. You would stigmatize.”

Some day, he added, it might be important to know the phenotypes — the characteristics — of violent killers and have their DNA, but not for the reasons many think.

“I am always happy to store DNA and phenotype information and freeze cells, thinking that one day we would have usable clues,” Dr. Hyman added. “But that would be biology, not prevention.”

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