U.S. Signals Support for Japan’s Yen Policy

MOSCOW — Ben S. Bernanke, the Federal Reserve chairman, strongly indicated on Friday that the United States did not intend to censure Japan for weakening its currency over the last several months, something that has aided Japanese exporters and angered its competitors.

Mr. Bernanke spoke in brief introductory remarks at a conference in Moscow of the Group of 20, a club of the world’s largest industrial and emerging economies.

At issue are stimulus programs backed by Prime Minister Shinzo Abe, who is also maintaining pressure on the Bank of Japan to keep interest rates near zero and flood the economy with money to support Japanese manufacturers. As a result, the yen has lost about 15 percent of its value against the dollar over the last three months, meaning products produced in Japan, like some Sony electronics or models of Toyota cars, are relatively cheaper.

Japan’s maneuver touched off fears that other countries and the European Union might follow suit in a so-called currency war, which has been the main topic of the Group of 20 meeting here, which runs through Saturday.

Initially, it seemed the world’s largest economies might agree on a firm statement at the end of the meeting to condemn a currency war, or competitive devaluations. This tactic is now widely seen as a beggar-thy-neighbor approach to creating growth that would ultimately harm a global recovery and is understood to be a cause of the lingering nature of the depression in the 1930s.

Mr. Bernanke, an advocate of the loose monetary policy in the United States known as quantitative easing, but also a student of the Great Depression, suggested a distinction should be drawn based on the intention of the monetary easing.

“The United States is using domestic policies to advance domestic agendas,” Mr. Bernanke said, speaking in a gilded and colonnaded chamber in the Kremlin to a round table of the world’s leading central bankers and finance ministers, in addition to President Vladimir V. Putin of Russia.

“We believe that by strengthening the U.S. economy, we are helping to strengthen the global economy as well,” Mr. Bernanke said. “We welcome similar approaches by other countries.” He said he endorsed an earlier statement at the meeting from Christine Lagarde, the director of the International Monetary Fund, who had said the risk of a currency war was “overblown.”

The global recovery has become unbalanced, Mr. Lagarde said in her statement to the group. Developed countries are swooning, while the emerging markets bounced back quickly, and yet such countries, including Russia, have been critical of the stimulus efforts of the developed nations. Japan’s devaluation of the yen is “sound policy,” she said.

“The international monetary system can function effectively if each country follows the right policies for their domestic economies,” she said, ultimately lifting the tide of the global marketplace, she said.

Ms. Lagarde did caution that too bald a ploy to prop up exports would not count as a justified weakening of a currency.

Because loose monetary policy encourages economic growth while also helping exports, critics of such tactics say these are distinctions without a difference.

Germany’s finance minister offered a contrarian view, saying that countries should not use easy money to avoid reducing their deficits over the long term, with measures like reducing government waste.

The Russian finance minister, Anton Siluanov, the host of the meeting, has also been pushing for a strong statement against competitive devaluations in the final communiqué from the forum, expected Saturday. Mr. Siluanov said in his opening remarks that a statement endorsing market mechanisms to set exchange rates would “find a place in the communiqué.”

That reiterated the position of a statement issued by the Group of 7 earlier this week. But it now seems a watered-down version is more likely.

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Oscar Pistorius remains in jail facing murder charge

JOHANNESBURG, South Africa -- South African athlete Oscar Pistorius, who made history last year as the first double amputee runner to compete in the Olympics using prosthetic blades, will spend the night in jail Thursday after he was charged with murder in the death of his girlfriend at his house, prosecutors said.

The National Prosecuting Authority said Pistorius would remain in custody until his hearing Friday, when police intend to oppose bail.

Reeva Steenkamp, a 30-year-old model, died after being shot several times in the head and arm in Pistorius’ house in an upscale suburb in Pretoria.

PHOTOS: Pistorius in the London Olympics

Pistorius was ushered from the home by police Thursday morning with a gray hoodie covering his head and obscuring most of his face.

South Africans were in shock about the accusation against Pistorius, who became a hero during his long battle for the right to compete in the Olympics. After a controversy on whether the blades he uses to walk and run gave him an advantage in races, Pistorius was granted the right to compete in the London 2012 Olympic Games.

South Africa has one of the world's highest rates of murder and violent crime, and many South Africans keep guns at home to guard against intruders.

The Afrikaans-language newspaper Beeld suggested that Pistorius mistook his girlfriend for a burglar and killed her accidentally.

However, a police spokeswoman, Brig. Denise Beukes, said police were “surprised” at reports the killing was accidental, adding that that version hadn’t come from police, according to the South African Press Assn.

"I confirm there had been previous incidents of a domestic nature at his place,” said Beukes, adding that police couldn’t comment on the decision to oppose bail.

Beukes said police had interviewed neighbors who heard sounds at Pistorius’ home earlier in the evening, and also at the time the incident reportedly took place.

Pistorius’ father, Henke Pistorius, said his son was sad. But the older Pistorius said he didn’t know the facts.

“I don’t know nothing. It will be extremely obnoxious and rude to speculate,” he said in a radio interview. “If anyone makes a statement, it will have to be Oscar.”

An advertisement for Nike, one of Pistorius’ major sponsors, was removed from his official website Thursday. It had shown the athlete in a green lycra athletic suit and the slogan, “I am the bullet in the chamber."

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'Blade Runner' Oscar Pistorius Charged With Girlfriend's Murder

In a tragic epilogue to the inspiring story of a man who never gave up, Olympian Oscar Pistorius — who ran alongside able-bodied athletes on futuristic blades of carbon fiber as millions of people watched — has been charged with murder in the shooting death of his girlfriend.

News of the 26-year-old runner’s arrest in his hometown of Pretoria, South Africa, following the shooting death of model Reeva Steenkamp, stunned fans who had cheered him on, and the country that considered him a national hero.

“He was an icon for South Africa,” Hennie Kotze, who was among the coaches who worked with Pistorius on the 400-meter relay team at the 2012 Summer Olympics, told The New York Times. “It was the way he handled his disability with such character and discipline. It is a big shock for everyone.”

Early reports held that Pistorius, known as Blade Runner for his prosthetic legs, accidentally shot Steenkamp after mistaking her for an intruder. But police Brigadier Denise Beukes told reporters Thursday there was no evidence to support that and there was a history of domestic disturbances at the couple’s home in an upscale neighborhood. Pistorius was arrested Thursday morning, charged with murder and jailed. Police are expected to oppose bail.

Steenkamp reportedly was shot four times with a 9mm handgun.

Pistorius, who was born without fibulas and had both legs amputated below the knee before he was a year old, made history last summer when he became the first double-amputee to run in the Olympics. He reached the 400-meter semifinal and ran in the 4×400 meter relay. (He also ran in the Paralympic Games, winning three medals and setting two world records. ) His appearance in the Olympics was the source of great debate — particularly whether his blade-like prosthetics provide an unfair advantage — and forced us to reconsider the role of prosthetics and bionic limbs in modern sports and their impact on future Olympics. More than that, though, Pistorius was an inspiring figure, a charming man with a bright smile and cheerful demeanor. He was a hero to millions, including some of those who competed alongside him.

When Pistorius finished last in his 400-meter semifinal heat, Grenadian runner Kirani James — who went on to win gold — asked Pistorius to swap race bibs in a tremendous sign of respect. “It was a perfect moment,” two time Olympic medalist Bernard Lagat told USA Today Thursday as he recalled Pistorius’ Olympic accomplishments. “And nothing will taint that moment, this story aside.”

Still, Pistorius wanted to be known only as an athlete, not a Paralympian or someone deserving of special consideration. This much was clear when we sat down with him last summer before a race in New York. He had no interest in discussing his legs, or the controversy surrounding them. He was far more interested in discussing his training regimen and athletic goals. His legs are just legs, he said.

“It’s carbon fiber,” Pistorius said of his Ossus Cheetah prosthetic limbs. “It’s been used on prosthetic legs for 20 years, the leg I run on has been made since 1996.”

After experiencing his first loss in the Paralympic 200 meters in nine years last summer, Pistorius damaged his reputation when he questioned the legitimacy of Brazilian winner Alan Oliveira’s prosthetic blades. That prompted quite a controversy, prompting Pistorius to apologize for the comments and hail champion Jonnie Peacock of Britain as a “great Paralympic sprinter.”

Pistorius’ sponsors, including Ossur, which makes his prosthetic blades, Nike and Oakley expressed condolences to the families, but refrained from further comment. A Nike ad featuring the runner sprinting out of the starting blocks and the tagline, “I am the bullet in the chamber” was pulled from Pistorius’ website on Thursday.

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Doctor and Patient: Afraid to Speak Up to Medical Power

The slender, weather-beaten, elderly Polish immigrant had been diagnosed with lung cancer nearly a year earlier and was receiving chemotherapy as part of a clinical trial. I was a surgical consultant, called in to help control the fluid that kept accumulating in his lungs.

During one visit, he motioned for me to come closer. His voice was hoarse from a tumor that spread, and the constant hissing from his humidified oxygen mask meant I had to press my face nearly against his to understand his words.

“This is getting harder, doctor,” he rasped. “I’m not sure I’m up to anymore chemo.”

I was not the only doctor that he confided to. But what I quickly learned was that none of us was eager to broach the topic of stopping treatment with his primary cancer doctor.

That doctor was a rising superstar in the world of oncology, a brilliant physician-researcher who had helped discover treatments for other cancers and who had been recruited to lead our hospital’s then lackluster cancer center. Within a few months of the doctor’s arrival, the once sleepy department began offering a dazzling array of experimental drugs. Calls came in from outside doctors eager to send their patients in for treatment, and every patient who was seen was promptly enrolled in one of more than a dozen well-documented treatment protocols.

But now, no doctors felt comfortable suggesting anything but the most cutting-edge, aggressive treatments.

Even the No. 2 doctor in the cancer center, Robin to the chief’s cancer-battling Batman, was momentarily taken aback when I suggested we reconsider the patient’s chemotherapy plan. “I don’t want to tell him,” he said, eyes widening. He reeled off his chief’s vast accomplishments. “I mean, who am I to tell him what to do?”

We stood for a moment in silence before he pointed his index finger at me. “You tell him,” he said with a smile. “You tell him to consider stopping treatment.”

Memories of this conversation came flooding back last week when I read an essay on the problems posed by hierarchies within the medical profession.

For several decades, medical educators and sociologists have documented the existence of hierarchies and an intense awareness of rank among doctors. The bulk of studies have focused on medical education, a process often likened to military and religious training, with elder patriarchs imposing the hair shirt of shame on acolytes unable to incorporate a profession’s accepted values and behaviors. Aspiring doctors quickly learn whose opinions, experiences and voices count, and it is rarely their own. Ask a group of interns who’ve been on the wards for but a week, and they will quickly raise their hands up to the level of their heads to indicate their teachers’ status and importance, then lower them toward their feet to demonstrate their own.

It turns out that this keen awareness of ranking is not limited to students and interns. Other research has shown that fully trained physicians are acutely aware of a tacit professional hierarchy based on specialties, like primary care versus neurosurgery, or even on diseases different specialists might treat, like hemorrhoids and constipation versus heart attacks and certain cancers.

But while such professional preoccupation with privilege can make for interesting sociological fodder, the real issue, warns the author of a courageous essay published recently in The New England Journal of Medicine, is that such an overly developed sense of hierarchy comes at an unacceptable price: good patient care.

Dr. Ranjana Srivastava, a medical oncologist at the Monash Medical Centre in Melbourne, Australia, recalls a patient she helped to care for who died after an operation. Before the surgery, Dr. Srivastava had been hesitant to voice her concerns, assuming that the patient’s surgeon must be “unequivocally right, unassailable, or simply not worth antagonizing.” When she confesses her earlier uncertainty to the surgeon after the patient’s death, Dr. Srivastava learns that the surgeon had been just as loath to question her expertise and had assumed that her silence before the surgery meant she agreed with his plan to operate.

“Each of us was trying our best to help a patient, but we were also respecting the boundaries and hierarchy imposed by our professional culture,” Dr. Srivastava said. “The tragedy was that the patient died, when speaking up would have made all the difference.”

Compounding the problem is an increasing sense of self-doubt among many doctors. With rapid advances in treatment, there is often no single correct “answer” for a patient’s problem, and doctors, struggling to stay up-to-date in their own particular specialty niches, are more tentative about making suggestions that cross over to other doctors’ “turf.” Even as some clinicians attempt to compensate by organizing multidisciplinary meetings, inviting doctors from all specialties to discuss a patient’s therapeutic options, “there will inevitably be a hierarchy at those meetings of who is speaking,” Dr. Srivastava noted. “And it won’t always be the ones who know the most about the patient who will be taking the lead.”

It is the potentially disastrous repercussions for patients that make this overly developed awareness of rank and boundaries a critical issue in medicine. Recent efforts to raise safety standards and improve patient care have shown that teams are a critical ingredient for success. But simply organizing multidisciplinary lineups of clinicians isn’t enough. What is required are teams that recognize the importance of all voices and encourage active and open debate.

Since their patient’s death, Dr. Srivastava and the surgeon have worked together to discuss patient cases, articulate questions and describe their own uncertainties to each other and in patients’ notes. “We have tried to remain cognizant of the fact that we are susceptible to thinking about hierarchy,” Dr. Srivastava said. “We have tried to remember that sometimes, despite our best intentions, we do not speak up for our patients because we are fearful of the consequences.”

That was certainly true for my lung cancer patient. Like all the other doctors involved in his care, I hesitated to talk to the chief medical oncologist. I questioned my own credentials, my lack of expertise in this particular area of oncology and even my own clinical judgment. When the patient appeared to fare better, requiring less oxygen and joking and laughing more than I had ever seen in the past, I took his improvement to be yet another sign that my attempt to talk about holding back chemotherapy was surely some surgical folly.

But a couple of days later, the humidified oxygen mask came back on. And not long after that, the patient again asked for me to come close.

This time he said: “I’m tired. I want to stop the chemo.”

Just before he died, a little over a week later, he was off all treatment except for what might make him comfortable. He thanked me and the other doctors for our care, but really, we should have thanked him and apologized. Because he had pushed us out of our comfortable, well-delineated professional zones. He had prodded us to talk to one another. And he showed us how to work as a team in order to do, at last, what we should have done weeks earlier.

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Media Decoder Blog: CBS Reports Record Operating Income for 4th Quarter

The CBS Corporation set records in the fourth quarter for operating income and adjusted operating income, the company said Thursday, but the results were short of some analysts’ expectations, causing its share price to fall slightly in after-hours trading.

The adjusted net earnings of $414 million produced earnings per share of 64 cents, also a new quarterly record for CBS, though some analysts had forecast a price as high as 69 cents.

CBS, which reported full-year results for 2012 as well as for the quarter ending Dec. 31, also announced an additional stock buyback of $1 billion. That brings the total amount of stock CBS has committed to repurchasing for the current year to $2.2 billion.

Over all, CBS demonstrated improved results in most financial categories and divisions. Revenues for the quarter rose to $3.7 billion, up 2 percent from $3.61 billion for the comparable quarter in 2011.

The company reported net income of $393 million, or 60 cents a share, up 6.2 percent from $370 million, or 55 cents a share, in the fourth quarter of 2011.

CBS cited increases in advertising revenue in the quarter, partly driven by political commercials in an election year. The CBS broadcast network continues to be the most watched in television and will likely beat all its competitors in the significant ratings categories for the current season.

The company also saw increases from subscription fees, driven by improvement in its cable networks. Showtime, the pay-cable channel owned by CBS, has experienced growth in subscriptions, thanks in part to its award-winning drama “Homeland.” CBS has pressed for years for increased compensation from cable systems for the rights to carry CBS broadcast stations, and Thursday the company reported that retransmission fees were also up for the quarter, part of 9 percent growth overall in affiliate and subscription fees.

Adjusted operating income before depreciation and amortization increased 6 percent, to $866 million from $814 million the year before. Operating income increased 12 percent to $726 million, up from $647 million.

For the full year CBS also produced some encouraging results. The company reported revenues of $14.09 billion, up 3 percent from $13.64 billion in 2011. Adjusted income increased to $3.49 billion from $3.16 billion. Operating income of $2.98 billion was up from $2.62 billion in 2011. All represented new highs for CBS.

One more troubling area was publishing. CBS’s Simon & Schuster unit experienced a decrease in revenues, to $215 million from $229 million in 2011. CBS attributed the drop to decreasing print book sales that could not be offset by increasing e-book sales.

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Dorner manhunt: Investigators work to ID charred human remains

After what LAPD Chief Charlie Beck called "a bittersweet night," investigators Wednesday were in the process of identifying the human remains found in the charred cabin where fugitive ex-cop Christopher Dorner was believed to have been holed up after trading gunfire with officers, authorities said.

If the body is identified as Dorner’s, the standoff would end a weeklong manhunt for the ex-LAPD officer and Navy Reserve lieutenant suspected in a string of shootings following his firing by the Los Angeles Police Department several years ago. Four people have died in the case, allegedly at Dorner’s hands.

Beck said he would not consider the manhunt over until the body was identified as Dorner. Police remained on tactical alert and were conducting themselves as if nothing had changed in the case, officials said.

PHOTOS: Manhunt for ex-LAPD officer

The latest burst of gunfire came Tuesday after the suspect, attempting to flee law enforcement officials, fatally shot a San Bernardino County sheriff’s deputy and seriously injured another, officials said. He then barricaded himself in a wooden cabin outside Big Bear, not far from ski resorts in the snow-capped San Bernardino Mountains east of Los Angeles, according to police.

"This could have ended much better, it could have ended worse," said Beck as he drove to the hospital where the injured deputy was located. "I feel for the family of the deputy who lost his life."

The injured deputy is expected to survive but it is anticipated he will need several surgeries. The names of the two deputies have not been released.

TIMELINE: Manhunt for ex-LAPD officer

Just before 5 p.m., authorities smashed the cabin's windows, pumped in tear gas and called for the suspect to surrender, officials said. They got no response. Then, using a demolition vehicle, they tore down the cabin's walls one by one. When they reached the last wall, they heard a gunshot. Then the cabin burst into flames, officials said.

Last week, authorities said they had tracked Dorner to a wooded area near Big Bear Lake. They found his torched gray Nissan Titan with several weapons inside, the said, and the only trace of Dorner was a short trail of footprints in newly fallen snow.

According to a manifesto that officials say Dorner posted on Facebook, he felt the LAPD unjustly fired him several years ago, when a disciplinary panel determined that he lied in accusing his training officer of kicking a mentally ill man during an arrest. Beck has promised to review the case.

DOCUMENT: Read the manifesto

The manifesto vows "unconventional and asymmetrical warfare" against law enforcement officers and their families. "Self-preservation is no longer important to me. I do not fear death as I died long ago," it said.

On Tuesday morning, two maids entered a cabin in the 1200 block of Club View Drive and ran into a man who they said resembled the fugitive, a law enforcement official said. The cabin was not far from where Dorner's singed truck had been found and where police had been holding news conferences about the manhunt.

The man tied up the maids, and he took off in a purple Nissan parked near the cabin, the official said. About 12:20 p.m., one of the maids broke free and called police.

FULL COVERAGE: Sweeping manhunt for ex-cop

Nearly half an hour later, officers with the California Department of Fish and Wildlife spotted the stolen vehicle and called for backup, authorities said. The suspect turned down a side road in an attempt to elude the officers but crashed the vehicle, police said.

A short time later, authorities said, the suspect carjacked a light-colored pickup truck. Allan Laframboise said the truck belonged to his friend Rick Heltebrake, who works at a nearby Boy Scout camp.

Heltebrake was driving on Glass Road with his Dalmatian, Suni, when a hulking African American man stepped into the road, Laframboise said. Heltebrake stopped. The man told him to get out of the truck.

INTERACTIVE MAP: Searching for suspected shooter

"Can I take my dog?" Heltebrake asked, according to his friend.

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Domestic-Drone Industry Prepares for Big Battle With Regulators

For a day, a sandy-haired Virginian named Jeremy Novara was the hero of the nascent domestic drone industry.

Novara went to the microphone at a ballroom in a Ritz-Carlton outside Washington D.C. on Wednesday and did something many in his business want to do: tenaciously challenge the drone regulators at the Federal Aviation Administration to loosen restrictions on unmanned planes over the United States. Judging from the reaction he received, and from the stated intentions of the drone advocates who convened the forum, the domestic-drone industry expects to do a lot more of that in the coming months.

There’s been a lot of hype around unmanned drones becoming a fixture over U.S. airspace, both for law enforcement use and for operations by businesses as varied as farmers and filmmakers. All have big implications for traditional conceptions of privacy, as unmanned planes can loiter over people’s backyards and snap pictures for far longer than piloted aircraft. The government is anticipating that drone makers could generate a windfall of cash as drones move from a military to a civilian role: Jim Williams of the Federal Aviation Administration told the Wednesday conclave of the Association for Unmanned Vehicle Systems International (AUVSI) that the potential market for government and commercial drones could generate “nearly $90 billion dollars in economic activity” over the next decade. $90 billion.

But there’s an obstacle: the Federal Aviation Administration.

The FAA has been reluctant to grant licenses to drone makers, out of the fear that the drones — which maneuver poorly, have alarming crash rates, are spoofable, and don’t have the sensing capacity to spot approaching aircraft — will complicate and endanger U.S. airspace. (Nor has it been transparent about the licenses it grants: the Electronic Frontier Foundation had to file a Freedom of Information Act request to learn who’s operating drones in America.) A push last year by Congress and the Obama administration directing the FAA to fully integrate unmanned aircraft into American skies hasn’t been nearly enough for the drone makers: the FAA is months late in designating six test sites for drones around the country.

“When will the test site selection begin? I’m sure that’s what all of you are asking now,” Williams, the head of the FAA’s drone integration department, told the AUVSI crowd. (It’ll start at the end of the month.)

Drone makers are also frustrated by the logic of existing FAA regulations. Currently, a drone weighing under 55 pounds, flying below 400 feet within an operator’s line of sight and away from an airport is considered a model airplane, and cleared to fly without a license. That is, if it’s not engaging in any for-profit activity — sort of. “A farmer can be a modeller if they operate their aircraft as a hobby or for recreational purposes,” Williams said.

Enter Novara, a 31-year old who owns a small drone business in Falls Church, Va. called Vanilla Aircraft. “If a farmer, who hopefully is profit-minded, can fly as a hobbyist an unmanned aircraft,” Novara challenged Williams, “why can’t I, as the owner of an unmanned aircraft company, fly as a hobbyist my own unmanned aircraft over property that I own? The guidelines before this [2012 legislation] were that any commercial intent is prohibited, but–”

“I didn’t change any guidelines,” Williams interrupted. “I didn’t say that any guidelines changed. I said that if a farmer as an individual wants to operate an unmanned aircraft according to the modeling rules, they can do that. The FAA rules are very clear about for-compensation and hire. If you’re going to operate an aircraft for compensation or hire, there’s a different set of rules that apply. So, you know, I’m not gonna split hairs over whether the farmer is making a profit or not, nor are we going to go look for him, but the bottom line is the rules are the rules and we have to enforce them until they’re changed.”

“So unmanned aircraft companies can operate R&D as long as they’re within the modeling guidelines?” Novara continued. Laughter and applause broke out among the hundreds of drone enthusiasts inside the Tyson’s Corner Ritz-Carlton.

“That’s why we have experimental certificates, to allow manufacturers–”

“The farmer doesn’t need an experimental certificate,” Novara pressed, “and everyone knows the experimental certificate process is available but not actually functional.”

Williams conceded that the current FAA rules “need to change,” since they were written for manned aircraft, “and that’s why we’re working hard to get the small unmanned aircraft rule out that will help resolve these issues. Until such time, we have to enforce the rules that are in place.”

“Is everyone else clear on this?” Novara asked, to bales of laughter. Some in the crowd shouted “No!” It felt like pent-up frustrations were being taken out on Williams, to the point where Novara added, apologetically, “I’m not trying to put this on you.”

But to the crowd at AUVSI, Novara was a hero. Outside the hall as he walked by, an older man slapped him on the shoulder and laughed, “Hey, troublemaker! I need to talk to you later!”

Expect a lot more troublemaking over the coming months. And if the domestic drone industry doesn’t succeed in getting the FAA to move fast enough for it, it’s prepared to pressure Congress to kick the FAA into gear. “Every company needs to call their Congressman,” said Peter Bale, the chairman of the board of AUVSI. April 9 is the organization’s “Day on The Hill,” when the drone industry intends to put the screws to legislators and their staff.

Novara says that he’s pessimistic that the lobbying will do any good for him: he expects it to benefit the aviation giants with established drone businesses with the government instead. (Especially as they’re the ones that make the campaign contributions.) He’s sympathetic to the FAA’s commitment to aviation safety: “I’m not advocating anarchy in the skies,” he says. But Novara sees a potential for the commercial domestic drone sector to get regulated out of business before a domestic drone boom actually starts.

“If we were all smart guys, we’d be in consumer products, right?” Novara tells Danger Room. “It’s what I like doing. There’s just no money in it.”

As the domestic-drone industry gets ready to press the FAA and Congress to loosen regulations on unmanned planes in U.S. airspace, there’s something to keep in mind. The FAA’s mandate is to protect the safety of air travel — not the privacy rights of Americans.

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Phys Ed: Getting the Right Dose of Exercise

Phys Ed

Gretchen Reynolds on the science of fitness.

Fitness Tracker

Marathon, half-marathon, 10k and 5K training plans to get you race ready.

A common concern about exercise is that if you don’t do it almost every day, you won’t achieve much health benefit. But a commendable new study suggests otherwise, showing that a fairly leisurely approach to scheduling workouts may actually be more beneficial than working out almost daily.

For the new study, published this month in Exercise & Science in Sports & Medicine, researchers at the University of Alabama at Birmingham gathered 72 older, sedentary women and randomly assigned them to one of three exercise groups.

One group began lifting weights once a week and performing an endurance-style workout, like jogging or bike riding, on another day.

Another group lifted weights twice a week and jogged or rode an exercise bike twice a week.

The final group, as you may have guessed, completed three weight-lifting and three endurance sessions, or six weekly workouts.

The exercise, which was supervised by researchers, was easy at first and meant to elicit changes in both muscles and endurance. Over the course of four months, the intensity and duration gradually increased, until the women were jogging moderately for 40 minutes and lifting weights for about the same amount of time.

The researchers were hoping to find out which number of weekly workouts would be, Goldilocks-like, just right for increasing the women’s fitness and overall weekly energy expenditure.

Some previous studies had suggested that working out only once or twice a week produced few gains in fitness, while exercising vigorously almost every day sometimes led people to become less physically active, over all, than those formally exercising less. Researchers theorized that the more grueling workout schedule caused the central nervous system to respond as if people were overdoing things, sending out physiological signals that, in an unconscious internal reaction, prompted them to feel tired or lethargic and stop moving so much.

To determine if either of these possibilities held true among their volunteers, the researchers in the current study tracked the women’s blood levels of cytokines, a substance related to stress that is thought to be one of the signals the nervous system uses to determine if someone is overdoing things physically. They also measured the women’s changing aerobic capacities, muscle strength, body fat, moods and, using sophisticated calorimetry techniques, energy expenditure over the course of each week.

By the end of the four-month experiment, all of the women had gained endurance and strength and shed body fat, although weight loss was not the point of the study. The scientists had not asked the women to change their eating habits.

There were, remarkably, almost no differences in fitness gains among the groups. The women working out twice a week had become as powerful and aerobically fit as those who had worked out six times a week. There were no discernible differences in cytokine levels among the groups, either.

However, the women exercising four times per week were now expending far more energy, over all, than the women in either of the other two groups. They were burning about 225 additional calories each day, beyond what they expended while exercising, compared to their calorie burning at the start of the experiment.

The twice-a-week exercisers also were using more energy each day than they had been at first, burning almost 100 calories more daily, in addition to the calories used during workouts.

But the women who had been assigned to exercise six times per week were now expending considerably less daily energy than they had been at the experiment’s start, the equivalent of almost 200 fewer calories each day, even though they were exercising so assiduously.

“We think that the women in the twice-a-week and four-times-a-week groups felt more energized and physically capable” after several months of training than they had at the start of the study, says Gary Hunter, a U.A.B. professor who led the experiment. Based on conversations with the women, he says he thinks they began opting for stairs over escalators and walking for pleasure.

The women working out six times a week, though, reacted very differently. “They complained to us that working out six times a week took too much time,” Dr. Hunter says. They did not report feeling fatigued or physically droopy. Their bodies were not producing excessive levels of cytokines, sending invisible messages to the body to slow down.

Rather, they felt pressed for time and reacted, it seems, by making choices like driving instead of walking and impatiently avoiding the stairs.

Despite the cautionary note, those who insist on working out six times per week need not feel discouraged. As long as you consciously monitor your activity level, the findings suggest, you won’t necessarily and unconsciously wind up moving less over all.

But the more fundamental finding of this study, Dr. Hunter says, is that “less may be more,” a message that most likely resonates with far more of us. The women exercising four times a week “had the greatest overall increase in energy expenditure,” he says. But those working out only twice a week “weren’t far behind.”

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Stock Indexes End Mixed

The stock market lacked direction on Wednesday, as a slump in McDonald’s stock helped pull the Dow Jones industrial average below 14,000. Other major market indexes were marginally higher.

McDonald’s was among the biggest decliners in the Dow, losing $1.10, to $94, as investors worried that Americans were spending less on eating out after a rise in Social Security taxes at the beginning of the year. The government reported early Wednesday that spending by Americans barely grew last month.

Other fast-food companies also fell. Buffalo Wild Wings stock plunged $4.52, to $76.55, after its earnings fell short of analysts’ expectations. Burger King and Wendy’s also fell.

“Consumer spending is coming under pressure,” said Bryan Elliott, an analyst at Raymond James. “It’s the easiest way to save money; stay at home and cook.”

The Dow Jones industrial average fell 35.79 points, or 0.26 percent, to 13,982.91. The Dow is still up 6.71 percent so far this year and is just 182 points below the record close of 14,164 set on Oct. 9, 2007.

The Standard & Poor’s 500-stock index edged up 0.90 point, or 0.06 percent, to 1,520.33. The index climbed as high as 1,524.69 during the day, the highest since November 2007. It is up 6.6 percent so far this year.

The Nasdaq composite index rose 10.38 points, or 0.33 percent, to 3,196.88.

Investors sent General Electric and Comcast higher after G.E. agreed Tuesday to sell its stake in NBCUniversal to Comcast for $16.7 billion. G.E. said it would use up to $10 billion of the money to buy back its own stock. Shares of G.E. rose 81 cents, to $23.39. Comcast advanced $1.16, to $40.13.

Trading has been relatively quiet in recent days following a strong opening to the year.

“We’re cautiously optimistic on stocks,” said Colleen Supran, principal at Bingham, Osborn & Scarborough. “There is some indication that we could be continuing on this slow growth trajectory.”

Ms. Supran said investors should still be prepared for volatility in the stock market and not assume that the gains from January and so far in February will set the pattern for the rest of the year.

Strengthening the economy and creating jobs were major topics in President Obama’s State of the Union address Tuesday. Although the economy is healthier than it was four years ago, growth remains slow and unemployment high.

The government reported that spending at retail businesses and restaurants slowed last month after higher taxes cut paychecks. Retail sales growth slowed to 0.1 percent in January, from a 0.5 percent increase in December.

Among the stocks on the move, Groupon rose 28 cents, to $5.57, after the brokerage firm Sterne, Agee & Leach, raised its rating on the company to buy from neutral, citing the long-term potential for Groupon’s changing business model. The online deals company has lost almost three-quarters of its value since going public in November 2011 at $20 as revenue growth slowed.

Dean Foods, a milk producer, fell $1.69, or 9.19 percent, to $16.70, after its profit forecast fell short of Wall Street expectations.

As stocks have advanced this year, bond prices have slumped and interest rates have risen. On Wednesday, the price of the 10-year Treasury note fell 13/32, to 96 15/32, while its yield rose to 2.03 percent, from 1.98 percent late Tuesday.

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Christopher Dorner, wildlife officers got into car-to-car gun battle

Fugitive  Christopher Dorner suddenly resurfaced Tuesday afternoon, engaging in a vehicle-to-vehicle gun battle with California Department of Fish and Wildlife officers before holing up in a Big Bear-area cabin as dozens of officers homed in.

Two San Bernardino sheriff's deputies have been injured in the confrontation, sources said. The extent of their injuries was unknown.

The incidents quickly unfolded Tuesday morning after Dorner left a nearby home he had broken into days ago, a source said. He allegedly had tied up a couple inside and held them hostage.

PHOTOS: Manhunt for ex-LAPD officer

Then Dorner was allegedly spotted by state Fish and Wildlife officers in a white pickup truck, the source said. When they attempted to stop him, Dorner crashed the truck and exchanged gunfire with the officers as he fled into a vacation cabin, where he was quickly surrounded by San Bernardino County sheriff’s deputies, the source said.

The source said one deputy was wounded as Dorner fired out of the cabin and a second was injured when Dorner exited the back of the cabin, deployed a smoke grenade and opened fire again in an apparent attempt to flee. Dorner was driven back inside the cabin, the source said.

Candy Martin, owner of the 84-year-old cabin, said she turned on the news and saw her cabin surrounded by police. It appeared Dorner was in the main cabin that is on the property with six smaller cabins.

PHOTOS: Manhunt for ex-LAPD officer

Martin said she told police the cabins were supposed to be empty Monday and had no cable, phone or Internet service. There were also no firearms inside, she said.

"It's quite shocking," she said. "I mean, it's good and bad news. If it is him, I hope that they catch him and this whole horrible thing is put to rest. At the same time, who wants this happening on their property?"

Statewide alerts were issued in California and Nevada, and border authorities were alerted. The Transportation Security Administration also had issued an alert urging pilots and other aircraft operators to keep an eye out for Dorner.

The search turned to Big Bear last week after Dorner's burning truck was found on a local forest road.

At the search's height, more than 200 officers scoured the mountain, conducting cabin-by-cabin checks. It was scaled back Sunday — about 30 officers were out in the field Tuesday, the San Bernardino County Sheriff's Department said.

Dorner allegedly threatened "unconventional and asymmetrical warfare" against police in a lengthy manifesto that authorities say he posted on Facebook. The posting named dozens of potential targets, including police officers, whom Dorner allegedly threatened to attack, according to authorities.

Records state that the manifesto was discovered by authorities Wednesday, three days after the slaying of an Irvine couple: Monica Quan, a Cal State Fullerton assistant basketball coach, and her fiance, Keith Lawrence, a USC public safety officer.

Quan was the daughter of a retired LAPD captain whom Dorner allegedly blamed in part for his firing from the force in 2009.

Federal documents also provide new details on Dorner's alleged attack against officers early Thursday in Riverside County.

The first shooting was in Corona after an eyewitness reported a person matching Dorner's description at a gas station, telling an LAPD officer "who was detailed to the area to protect one of the officials whom Dorner had threatened," according to the court records.

"When the officer drove by the gas station, the suspect exited his vehicle and fired an assault rifle at the officer, hitting the officer's vehicle," according to the court records.

The LAPD later said the officer received a grazing wound. 

About 30 minutes later, Dorner opened fire on Riverside police officers "who were in the area searching for Dorner," the documents said. On that detail, the account conflicts with a statement provided to the media by Riverside police officials, who said the officers were stopped at a red light and were not looking for Dorner.

Riverside Officer Michael Crain, 34, a married father of two who served two tours in Kuwait as a rifleman in the Marines, was killed in the attack. His partner remains hospitalized, Police Chief Sergio Diaz said, and it was unclear if he would be able to return to active duty.

Dorner was charged Monday with one count of murder, with special-circumstance allegations in the killing of a peace officer and the discharge of a firearm from a vehicle, in connection with Crain's death. He faces three additional charges of attempted murder.

Riverside Dist. Atty. Paul Zellerbach said because of the special-circumstance allegations, Dorner could be eligible for the death penalty if convicted.

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