Why death comes sooner in America

A report finds that Americans have "shorter lives and poorer health," coming in last in key areas behind 16 other rich nations

STORY HIGHLIGHTS

• Aaron Carroll: New study shows U.S. health and lifespan worst of 17 rich countries


• He says it's because of personal choices, systemic woes. Poverty high, health care uneven


• He says this particularly affects youth, plagued by sickness, violence, high mortality


• Carroll: Don't make it political. The richest country in the world must improve public health

Editor's note: Dr. Aaron E. Carroll is an associate professor of pediatrics at the Indiana University School of Medicine and the director of the university's Center for Health Policy and Professionalism Research. He blogs about health policy at The Incidental Economist and tweets at @aaronecarroll.

(CNN) -- A just-released report from the Institute of Medicine and National Research Council is making news by clearly illustrating that Americans have "shorter lives and poorer health." This is somewhat shocking, given how much we spend on health care each year — more than any of the 16 other rich countries surveyed in the study. What's even more upsetting is that this report focused quite heavily on people who are young. In the United States, even that group fared poorly.

Aaron Carroll

Why is this?

Some of the reasons involve choices make at a personal level. We eat too much, abuse drugs too often, wear seat belts too rarely and commit violence against each other to often.

Systemic issues are also to blame. We have higher levels of poverty than comparable countries, and our safety net programs are less capable of catching people when they fall. And too many also have too much trouble accessing the health care system, resulting in inefficient, ineffective and often absent care.

It's far too easy to let these dreadful statistics become obscured in a politically charged argument. Let's avoid that. This report is so stark that it's going to take a concerted effort on the part of the government, the media, the health care system and everyday citizens to turn things around. Our personal choices are bad. Our safety nets are bad. Our health care system is bad. It's all bad. How bad?

When compared with peer countries, the United States was the absolute worst with respect to still births, infant mortality and low birth weight. Some have tried to blame this on "coding" differences. In other words, they will claim that other countries will refuse to define a premature birth as we do, resulting in artificially high numbers in the United States. But when this report recalculated the rates to exclude such births equally in all countries, we still ranked last.

Things don't get better after birth. The chance that a child in the United States will die before age 5 is higher than in any of the other 16 peer countries. Injuries are the most common cause of death, but the United States also has the highest rate of deaths caused by negligence or abuse.

And violence is decidedly an American problem. Homicide is the third most common cause of death in children age 1-4.

From age 5-19, the trend continues. Kids this age in the United States have the worst health ranking of the 17 studied countries. More than one-third of U.S. children age 5-17 are obese or overweight, the highest of any peer country. The adolescent pregnancy rate in the United States is about 3.5 times the average of others. Additionally, the rates of sexually transmitted infections, including syphilis, gonorrhea and chlamydia are the worst compared to peer countries.

Nor are these children exempt from death. Injury deaths are more common in 15- to 19-year-olds in the United States than in any other studied country. Homicide claims the second highest number of lives in 15- to -24-year-olds, and 4 in 5 of those deaths involve guns. Males between the ages of 15 and 19 are five times as likely to die from violence in the United States than in other countries.

Even as young adults, ages 25-34, mortality remains consistently upsetting and preventable. Unintentional injuries remain the No. 1 cause of death. The risk of dying by violence remains seven times higher for males in the United States ages 20-24 than in other countries.

We have to work together to make these numbers better. Some of them can be improved with public health measures. We need to help Americans be less obese, to have fewer accidents and to commit less violence. There are lots of local studies and initiatives that propose ways to fix these things, but our public health system is woefully underfunded, and translating any promising findings to meaningful societal change poses a huge challenge.

We also need to improve our safety nets to help children at the lowest end of the socioeconomic ladder do better, even before they are born. Pregnant women, babies and children suffer from hunger and malnutrition far too often in the richest country in the world. Yet we still debate the merits of the federally funded WIC (Womens, Infants and Children) program, school lunches and food assistance to needy families.

Finally, we need to find a way to improve access to the health care system. The Medicaid program covers one in every three births and one in every three children in the United States, and it's still not enough. As some states balk at expanding Medicaid to cover many of the poorest uninsured, some are still talking about reducing funding to the already stretched program. There's no question that we have the capability, the knowledge and the resources to care for people. It's just a matter of doing it better.

There will be some who deny these results. Others will try to use them for political gain. That would be a mistake. We have to accept these findings and begin to work holistically to improve them. Being last just isn't the American way.

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The opinions expressed in this commentary are solely those of Aaron Carroll.

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Pa. VA hospital knew of bacteria problem before death

(CBS News) There's been an outbreak other than the flu at the VA Hospital in Pittsburgh. It raises the question: What do patients have the right to know?

The bacterium that causes the respiratory illness known as Legionnaires' disease was found in the hospital's water system. The hospital and government officials knew about the outbreak but not the patients who were admitted there.

In November, 87-year-old William Nicklas, a Navy veteran, felt nauseated from medication. He went to the Pittsburgh VA hospital. His sons, Bob and Dave Nicklas, weren't particularly concerned.

"He had full trust in the VA," Dave said. "He was loyal to the military, loyal to the treatment he would receive there.It should be the best care in the world."

But in the hospital, he picked up an infection.

"The doctors wanted to meet with us Wednesday night. The family got together, and that's when she told us it was the Legionella bacteria that was the infection," Bob said.

William fought for his life for three days. The day after Thanks giving he was dead. His family thought they would be bringing him home.

What the family didn't know when William checked in was that the Pittsburgh VA had been battling an outbreak of Legionnaires' disease. There were at least four infections before William, and the outbreak had been reported in the hospital's water nearly a year before his death.

The manufacturer of the hospital's Legionella prevention equipment, Liquitech, claims that in December 2011 the Pittsburgh VA told them it had a Legionella problem. In emails, Liquitech wrote the had been made aware of the bacteria and an investigation showed the hospital systems were not being properly maintained.

"If they knew that there was an outbreak at that hospital then you've got two other, you know, world renowned hospitals located directly across the street from the Veterans Hospital," Dave said. "They could have easily transferred those patients so they weren't exposed."

The hospital did report the problem to the county health department and the federal Centers for Disease Control, but it wasn't until two weeks after William was admitted that it went public. It acknowledged that patients had contracted Legionnaire's disease in the hospital. Two weeks later, the hospital announced 24 more were treated there, but the hospital said the origin of 16 of those infections was unknown.

"The facility has worked... to formulate a plan to suppress the Legionella. Testing results indicate remediation... has been successful," Pittsburgh VA said in a statement, declining an interview.

A federal investigation has begun into whether the hospital was prudent in protecting its patients. The hospital said it is under no legal requirement to report Legionnaires' disease cases or outbreaks to the public or its patients. The Nicklas family plans to sue.

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Obama Promises Faster Transition in Afghanistan

President Obama and Afghan President Hamid Karzai said today that most U.S. combat operations in Afghanistan would end this spring, signaling a quickening troop drawdown that will bring the decade-long war to a close at the end of 2014.

"Our troops will continue to fight alongside Afghans when needed, but let me say it as plainly as I can: Starting this spring, our troops will have a different mission -- training, advising, assisting Afghan forces," Obama announced at an East Room news conference in Washington.

"It will be a historic moment and another step toward full Afghan sovereignty, something I know that President Karzai cares deeply about, as do the Afghan people," he said.

Administration officials said Afghan forces were "exceeding initial expectations" in their capabilities. Afghan security forces are expected to lead 90 percent of security operations across the country in February.

"By the end of next year -- 2014 -- the transition will be complete," Obama said. "Afghans will have full responsibility for their security, and this war will come to a responsible end."

The rosy assessments belied the serious political, economic and security challenges that remain.

Left unanswered by Obama and Karzai: How many U.S. troops might stay after 2014; what their mission would be and whether they could be effective; and whether the forces would have immunity from prosecution in Afghan courts.

Charles Dharapak/AP Photo

President Hamid Karzai Addresses Afghan Sovereignty at White House Watch Video

Afghanistan: Insider Attacks Mark War's 11th Anniversary Watch Video

Afghanistan Troop Surge Ends at Tumultuous Point Watch Video

Obama said he was still reviewing recommendations from the Pentagon and will make an announcement in the coming weeks after penning an anticipated bilateral security agreement with Afghanistan. Karzai said the exact number would be up to the United States to decide.

Both leaders confirmed in a statement that the United States "does not seek permanent bases in Afghanistan."

They also agreed today to turn over battlefield combatants held by the U.S. military in Afghanistan to Afghan government control, which has been long-sought by Karzai.

Roughly 66,000 U.S. troops are serving in Afghanistan. The military has proposed keeping several thousand troops in the country after 2014 as advisers, trainers and logistical support for Afghan forces; the White House has said it remains open to pulling out all troops entirely.

Obama's visit with Karzai was the first face-to-face encounter since the November election and since last year's dramatic increase in so-called green-on-blue attacks, when U.S. and NATO soldiers have been killed by the Afghans they are training or working alongside.

There were 45 insider attacks in 2012 that resulted in 62 deaths among coalition forces, including 35 Americans. There has been one attack already in the first 11 days of 2013.

The White House summit included a private Oval Office meeting between Obama, Karzai and Vice President Joe Biden. The trio also attended a private lunch in the Old Family Dining Room.

Karzai Thursday attended meetings with Defense Secretary Leon Panetta and top military brass at the Pentagon, where he was afforded all the pomp and circumstance accorded a head of state: a 21-gun salute, and marching bands and honor guards from the Army, Navy, Air Force, Marines and Coast Guard.

Karzai's relationship with the United States has at times been a rocky one as he has sometimes made critical statements about the allied troop presence in his country. U.S. officials believe he has made those comments out of political expediency to improve his standing with Afghans and show his independence.

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Muscle mimic pulls electricity from wet surface

Electricity has been squeezed from a damp surface for the first time, thanks to a polymer film that curls up and moves – a bit like an artificial muscle – when exposed to moisture. The film could be used to run small, wearable devices on nothing but sweat, or in remote locations where conventional electricity sources aren't available.

When a dry polymer absorbs water, its molecular structure changes. This can, in principle, be converted into larger-scale movement, and in turn electricity. But previous attempts at creating a material powered by a moisture gradient – the difference in chemical potential energy between a wet region and a dry region - failed to produce a useful level of force.

These unsuccessful tries used a polymer called polypyrrole. Now Robert Langer and colleagues at the Massachusetts Institute of Technology have turned to the material again, embedding chains of it within another material, polyol-borate. This more complex arrangement mimics structures found in muscles as well as in plant tissues that bend in response to changes in humidity.

Flipping film

The result looks like an ordinary piece of thin black plastic, but when placed on a wet surface, something extraordinary happens. As the material absorbs water, its end curls away from the surface and the film becomes unstable, so it flips over. The ends have now dried out, so they are ready to absorb more water, and the whole process repeats itself. This continuous flipping motion lets the film travel across a suitably moist surface unaided.

Langer found that a 0.03-millimetre-thick strip, weighing roughly 25 milligrams, could curl up and lift a load 380 times its mass to a height of 2 millimetres. It was also able to move sideways when carrying a load about 10 times its mass.

To extract energy from this effect, Langer's team added a layer of piezoelectric material – one which produces electricity when squeezed. When this enhanced film, weighing about 100 milligrams, flipped over, it generated an output of 5.6 nanowatts – enough to power a microchip in sleep mode.

Electricity from sweat

Though the output is small, it is proof that electricity can be extracted from a water gradient. "To the extent of our knowledge, we are the first to utilise a water gradient, without a pressure gradient, to generate electricity," says Langer.

Large-scale energy harvesting is unlikely as the size of the device needed would be impractical, but it could be used to power small devices such as environmental monitoring systems in remote locations. "It will be interesting for applications where the amount of energy needed may be low but where access to energy may be difficult," says Peter Fratzl at the Max-Planck Institute of Colloids and Interfaces in Potsdam, Germany, who was not involved in the work.

Another application, Langer suggests, would be to place the film inside the clothing of joggers or athletes. The evaporation of sweat could generate enough electricity to power sensors monitoring blood pressure and heart rate.

Journal reference: Science, DOI 10.1126/science.1230262

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Fiji's military ruler drops draft constitution

SUVA: Fiji's military government has announced it will dump a draft constitution prepared by an academic panel and prepare its own version, a move New Zealand labelled a "backward step" for the Pacific nation.

Military leaders in the coup-plagued island state commissioned a panel led by Kenyan academic Yash Ghai to draw up a constitution last year but took issue with some recommendations put forward in the document.

President Ratu Epeli Nailatikau said Ghai's blueprint risked reigniting racial tensions in Fiji, where divisions exist between the indigenous population and ethnic Indians brought to the country in the colonial era.

He said it also threatened to undo reforms introduced by Prime Minister Voreqe Bainimarama, who seized power in a 2006 coup and has pledged to hold elections in 2014 after the new constitution has been adopted.

"The Ghai draft (constitution ) can lead to financial and economic catastrophe and ruin," Nailatikau said in a nationally televised address on Thursday night.

While the draft has not been officially released, leaked copies indicate Ghai wanted the military, a key player in the four coups the Pacific nation has endured since 1987, to stay out of politics after the 2014 elections.

He also called for a transitional government to take over ahead of the 2014 vote, meaning Bainimarama would have to cede power.

New Zealand Foreign Minister Murray McCully said the government had effectively "trashed" the work of Ghai's Constitutional Commission, which completed its draft after receiving more than 7,000 public submissions.

He said the international community would be watching closely to ensure the new constitution allowed for free and fair elections, rather than providing a blueprint for the military's version of democracy.

"This is not flash, it's a backward step of some proportions," McCully told Radio New Zealand.

"But it's been the history of this whole process. This is not going to be a simple straight line towards elections and international credibility, there are always going to be steps forward and steps back."

He added that the move by the military to draw up its own draft constitution was "rather larger a step back than any of us feel comfortable with, but it's what we've got to work with".

The new draft constitution is expected to be completed by the end of the month.

- AFP/al

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Beheading exposes exploitation

(File photo) Sri Lankan women protest outside the Saudi Arabia embassy in Colombo on November 9, 2010.

STORY HIGHLIGHTS

• Saudi authorities beheaded Rizana Nafeek, a Sri Lankan woman


• She was convicted of killing a baby of the family employing her as a housemaid


• This was despite Nafeek's claims that the baby died in a choking accident


• Becker says her fate "should spotlight the precarious existence of domestic workers"

Jo Becker is the Children's Rights Advocacy Director for Human Rights Watch and author of 'Campaigning for Justice: Human Rights Advocacy in Practice.' Follow Jo Becker on Twitter.

(CNN) -- Rizana Nafeek was a child herself -- 17 years old according to her birth certificate -- when a four-month-old baby died in her care in Saudi Arabia. She had migrated from Sri Lanka only weeks earlier to be a domestic worker for a Saudi family.

Although Rizana said the baby died in a choking accident, Saudi courts convicted her of murder and sentenced her to death. On Wednesday, the Saudi government carried out the sentence in a gruesome fashion, by beheading Rizana.

Jo Becker

Read more: Outrage over beheading of Sri Lankan woman by Saudi Arabia

Rizana's case was rife with problems from the beginning. A recruitment agency in Sri Lanka knew she was legally too young to migrate, but she had falsified papers to say she was 23. After the baby died, Rizana gave a confession that she said was made under duress -- she later retracted it. She had no lawyer to defend her until after she was sentenced to death and no competent interpreter during her trial. Her sentence violated international law, which prohibits the death penalty for crimes committed before age 18.

Rizana's fate should arouse international outrage. But it should also spotlight the precarious existence of other domestic workers. At least 1.5 million work in Saudi Arabia alone and more than 50 million -- mainly women and girls -- are employed worldwide according to the International Labour Organization (ILO).

Read more: Indonesian maid escapes execution in Saudi Arabia

Again according to the ILO, the number of domestic workers worldwide has grown by more than 50% since the mid-1990s. Many, like Rizana, seek employment in foreign countries where they may be unfamiliar with the language and legal system, and have few rights.

When Rizana traveled to Saudi Arabia, for example, she may not have known that many Saudi employers confiscate domestic workers' passports and confine them inside their home, cutting them off from the outside world and sources of help.

It is unlikely that anyone ever told her about Saudi Arabia's flawed criminal justice system, or that while many domestic workers find kind employers who treat them well, others are forced to work for months or even years without pay, and subjected to physical or sexual abuse.

Passport photo of Rizana Nafeek

Read more: Saudi woman beheaded for 'witchcraft and sorcery'

Conditions for migrant domestic workers in Saudi Arabia are among some of the worst, but domestic workers in other countries rarely enjoy the same rights as other workers. In a new report this week, the International Labour Organization says that nearly 30% of the world's domestic workers are completely excluded from national labor laws. They typically earn only 40% of the average wage of other workers. Forty-five percent aren't even entitled by law to a weekly day off.

Last year, I interviewed young girls in Morocco who worked 12 hours a day, 7 days a week for a fraction of the minimum wage. One girl began working at age 12 and told me: "I don't mind working, but to be beaten and not to have enough food, this is the hardest part."

Many governments have finally begun to recognize the risks and exploitation domestic workers face. During 2012, dozens of countries took action to strengthen protections for domestic workers. Thailand, and Singapore approved measures to give domestic workers a weekly day off, while Venezuela and the Philippines adopted broad laws for domestic workers ensuring a minimum wage, paid holidays, and limits to their working hours. Brazil is amending its constitution to state that domestic workers have all the same rights as other workers. Bahrain codified access to mediation of labor disputes.

Read more: Convicted killer beheaded, put on display in Saudi Arabia

Perhaps most significantly, eight countries acted in 2012 to ratify -- and therefore be legally bound by -- the Domestic Workers Convention, with more poised to follow suit this year. The convention is a groundbreaking treaty adopted in 2011 to guarantee domestic workers the same protections available to other workers, including weekly days off, effective complaints procedures and protection from violence.

The Convention also has specific protections for domestic workers under the age of 18 and provisions for regulating and monitoring recruitment agencies. All governments should ratify the convention.

Many reforms are needed to prevent another tragic case like that of Rizana Nafeek. The obvious one is for Saudi Arabia to stop its use of the death penalty and end its outlier status as one of only three countries worldwide to execute people for crimes committed while a child.

Labor reforms are also critically important. They may have prevented the recruitment of a 17 year old for migration abroad in the first place. And they can protect millions of other domestic workers who labor with precariously few guarantees for their safety and rights.

Read more: Malala, others on front lines in fight for women

The opinions expressed in this commentary are solely those of Jo Becker.

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Student shot at Calif. high school by classmate

Updated at 5:48 p.m. ET

TAFT, Calif. A 16-year-old student armed with a shotgun walked into class in a rural California high school on Thursday and shot one student, fired at another but missed, and then was talked into surrendering by a teacher and another staff member, officials said.

The teen victim was in critical but stable condition, Kern County Sheriff Donny Youngblood told a press conference. The sheriff said the teacher suffered a minor pellet wound to the head but declined treatment.

The gunman had as many as 20 rounds of ammunition in his pocket, the sheriff said.

When the shots were fired, the teacher tried to get the more than two dozen students out a back door and also engaged the shooter in conversation to distract him, Youngblood said. A campus supervisor responding to a call of shots fired also began talking to the gunman.

"They talked him into putting that shotgun down. He in fact told the teacher, `I don't want to shoot you,' and named the person that he wanted to shoot," Youngblood said.

"The heroics of these two people goes without saying. ... They could have just as easily ... tried to get out of the classroom and left students and they didn't," the sheriff said. "They knew not to let him leave the classroom with that shotgun."

The shooter didn't show up for first period then interrupted the class of 28 students.

Investigators had not yet had a chance to interview the student and so had no immediate word on a motive or whether the attacker had a previous disciplinary record. Nor did they know where he got the shotgun.

The wounded student was flown to a hospital in Bakersfield. Officials said a female student was hospitalized with possible hearing damage because the shotgun was fired close to her ear, and another girl received minor injuries during the scramble to flee when she fell over a table.

Officials said there's usually an armed officer on campus but the person wasn't there because he was snowed in. Taft police officers arrived within 60 seconds of first reports.

The shooting happened on the second floor of the school's science building around 9 a.m., according to CBS affiliate KBAK in Bakersfield.

As word spread, Dayna Hopper rushed to the school to pick up her son Joseph Sorensen, 16, and daughter, Cheryle Pryor, 15, who had called from Cheryle's cellphone.

"I panicked. I wanted to puke and just get here," Dayna Hopper told The Bakersfield Californian.

KERO-TV Bakersfield reported that the station received phone calls from people inside the school who hid in closets.

The bell had just rung at a nearby school when teachers began shouting for students to get inside buildings, and the principal used an intercom to tell students to stay inside, Felicity Reich, 13, a student at Lincoln Junior High School, told the newspaper.

Shaken, she held the hand of her mother, Ellie Reich, as she spoke.

About 900 students are enrolled at the high school, which includes 9th through 12th grades. Authorities went room by room through the school and expected to spend the day checking backpacks to make sure no other weapons were on campus.

Masses of parents headed to the school football field to find their children, and officials at other schools took action to protect their students as well, the newspaper said.

Wilhelmina Reum, whose daughter Alexis Singleton is a fourth-grader at a nearby elementary school, got word of the attack while she was about 35 miles away in Bakersfield and immediately sped back to Taft.

"I just kept thinking this can't be happening in my little town," she told The Associated Press.

"I was afraid I was going to get hurt," Alexis said. "I just wanted my mom to get here so I could go home."

The Taft shooting came less than a month after a gunman massacred 20 children and six women at Sandy Hook Elementary School in Newtown, Conn., then killed himself.

That shooting prompted President Barack Obama to promise new efforts to curb gun violence. Vice President Joe Biden, who was placed in charge of the initiative, said he would deliver new policy proposals to the president by next week.

At the state Capitol, Assembly Speaker John Perez, D-Los Angeles, said the thoughts and prayers of legislators were with the people at the Taft school.

"It really is just another very sad moment as we deal with the ongoing reality of gun violence that has captured so much of our attention this last year," Perez said.

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Jodi Arias: 'No Jury Will Convict Me' for Murder

The jury in the Jodi Arias murder trial watched a television interview today in which Arias said "no jury will convict me" for killing her ex-boyfriend, Travis Alexander.

Arias added that she could never imagine committing such a violent act as killing Alexander.

"I understand all the evidence is really compelling," she said in the interview. "In a nutshell, two people came in and killed Travis. I've never even shot a gun. That's heinous. I can't imagine slitting anyone's throat."

She went on to tell the interviewer, "No jury will convict me and you can mark my words on that. ... I am innocent."

Arias made the statements to the television show "Inside Edition" after she was indicted for murdering Alexander. Months later, she would confess to killing him in his Mesa, Ariz., home and say it was in self-defense.

Jodi Arias Trial: Watch Live

Jodi Arias Murder Trial: Full Coverage

Photos of Key Players and Evidence in the Jodi Arias Murder Trial

The tape was played on the fifth day of testimony in Arias' trial, in which police allege that she carried out the murder with such brutal force that she stabbed Alexander 27 times, slashed his throat from ear to ear, and shot him in the head.

Arias, now 32, has claimed Alexander was a controlling and abusive "sexual deviant" who she was forced to kill in self-defense.

She could face the death penalty if convicted of Alexander's murder.

Jodi Arias Trial: Jurors See Photos of Bloody Handprint Watch Video

Jodi Arias Murder Trial: Who Is the Alleged Killer? Watch Video

Jodi Arias Trial: Defense Claims Victim Was Sex Deviant Watch Video

The defense petitioned the court to declare a mistrial at the end of testimony today, but the request was denied by Judge Sherry Stephens. Arias' attorneys claimed that testimony presented by Det. Esteban Flores about whether Arias shot Alexander first or at the end of the attack was different from his earlier testimony and, therefore, affected whether Arias was "especially cruel" during the killing -- but Stephens denied that it had any effect.

The jury also watched as dozens of photos of blood-spattered walls, flooring, stained carpets and blood smeared sink were explained in detail by a forensic analyst from the Mesa Police Department, who noted that on many of the stains water had been mixed with the blood and diluted it.

The prosecution has alleged that Arias tried to wash away the evidence of the killing with water.

Prosecutors spent much of today and Wednesday using Arias' recorded statements and other testimony to prove that she lied about her relationship with Alexander, where she was when Alexander was killed, and even where she worked as a bartender.

The testimony today suggested that Arias lied to her new boyfriend Ryan Burns about working at a bar called Margaritaville in her hometown of Yreka, Calif.

"Is there any restaurant in Yreka called Margaritaville? Has there ever been?" prosecutor Juan Martinez asked Nathaniel Mendes, a former detective with the Siskiyou County Sheriff's Office in California.

"No, sir," Mendes replied.

Mendes testified that Arias worked at a restaurant called Casa Ramos in Yreka, not a bar called Margaritaville, as she told Burns.

Mendes also went over receipts showing that Arias rented a car the day before she killed Alexander, and noted that she went to a rental outfit 90 miles from her hometown despite two businesses that rented cars in Yreka.

Arias told friends and investigators that she rented a car to go on a road trip to visit Burns, in West Jordan, Utah, on June 3, 2008. She showed up at Burns' house a day late with cuts on her hands, but told Burns that she got lost driving and that the cuts were from broken glass at her Margaritaville bartending job, according to Burns' testimony Wednesday.

The trail of receipts showed that Arias drove from California to Alexander's hometown of Mesa, Ariz., on Tuesday, June 4, 2008.

There, the pair had sex and took sexually graphic photos of one another, according to photographs and the opening statement of Arias' lawyer. Shortly after the tryst, Arias killed Alexander, both sides agree.

Burns testified that Arias never mentioned going to Alexander's house when she arrived at his home in Utah. He said he did not know that Arias and Alexander were still sexually involved, and that she told him they had broken up.

When she arrived at his home 24 hours after killing Alexander, she seemed "normal," he said. The pair kissed and cuddled, and went out with Burns' friends, where she laughed and made conversation.

Prosecutors have played recorded phone conversations between detectives and Arias in the weeks after Alexander's body was found. She could be heard apparently lying multiple times to investigators as they asked about the last time she spoke with Alexander and her trip to Utah.

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Hints of new dark force seen in galactic smash-ups

Colliding clusters of galaxies may hold clues to a mysterious dark force at work in the universe. This force would act only on invisible dark matter, the enigmatic stuff that makes up 86 per cent of the mass in the universe.

Dark matter famously refuses to interact with ordinary matter except via gravity, so theorists had assumed that its particles would be just as aloof with each other. But new observations suggest that dark matter interacts significantly with itself, while leaving regular matter out of the conversation.

"There could be a whole class of dark particles that don't interact with normal matter but do interact with themselves," says James Bullock of the University of California, Irvine. "Dark matter could be doing all sorts of interesting things, and we'd never know."

Some of the best evidence for dark matter's existence came from the Bullet cluster, a smash-up in which a small galaxy cluster plunged through a larger one about 100 million years ago. Separated by hundreds of light years, the individual galaxies sailed right past each other, and the two clusters parted ways. But intergalactic gas collided and pooled on the trailing ends of each cluster.

Mass maps of the Bullet cluster showed that dark matter stayed in line with the galaxies instead of pooling with the gas, proving that it can separate from ordinary matter. This also hinted that dark matter wasn't interacting with itself, and was affected by gravity alone.

Musket shot

Last year William Dawson of the University of California, Davis and colleagues found an older set of clusters seen about 700 million years after their collision. Nicknamed the Musket Ball cluster, this smash-up told a different tale. When Dawson's team analysed the concentration of matter in the Musket Ball, they found that galaxies are separated from dark matter by about 19,000 light years.

"The galaxies outrun the dark matter. That's what creates the offset," Dawson said. "This is fitting that picture of self-interacting dark matter." If dark matter particles do interact, perhaps via a dark force, they would slow down like the gas.

This new picture could solve some outstanding mysteries in cosmology, Dawson said this week during a meeting of the American Astronomical Society in Long Beach, California. Non-interacting dark matter should sink to the cores of star clusters and dwarf galaxies, but observations show that it is more evenly distributed. If it interacts with itself, it could puff up and spread outward like a gas.

So why doesn't the Bullet cluster show the same separation between dark matter and galaxies? Dawson thinks it's a question of age – dark matter in the younger Bullet simply hasn't had time to separate.

New window

The idea complements a previous study that saw evidence for dark forces at work in the Bullet cluster. In 2007 Glennys Farrar of New York University and colleagues said that the smaller cluster was moving too fast for gravity alone to be responsible. They suggested that some mysterious force related to dark matter might be hurrying it along.

Still, two clusters is not a lot to go on. Dawson, Bullock and colleagues are following up with about 20 more galactic collisions to see if they show any unusual behaviours. "I really think that we're almost to the point where we have enough observational data in hand," Dawson said. "We could close the book on self-interacting dark matter."

If the new force does exist, we might soon be able to see its effects on things influenced by dark matter, such as the behavior of black holes or the masses of the first stars, says Douglas Finkbeiner of Harvard University in Cambridge, Massachusetts, who was not involved in the new study.

"The simple thing isn't always the right thing, so I really appreciate that Will is trying to look into these other possibilities," he says.

Louis Strigari of Stanford University in California agrees. "Self-interacting dark matter is worth pursuing because we're still very ignorant," he said. "We're desperate to understand what dark matter is, so any new window is welcome."

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China's 2012 trade surplus surges 48%

BEIJING: China's trade surplus surged 48.1 percent to $231.1 billion in 2012 from the previous year, though total trade volume grew at a much slower pace, official data showed on Thursday.

Exports from the world's second-largest economy rose 7.9 percent to $2.05 trillion, while imports increased 4.3 percent to $1.82 trillion, the national customs bureau said.

China's trade volume, or the total of exports and imports, grew 6.2 percent in 2012, well below the government's target of about 10 percent.

Customs spokesman Zheng Yuesheng said 2012's performance came "despite a sharply slowing world economic recovery, weak international market demand and rather big downside pressure on the domestic economy".

Zheng told reporters: "China's foreign trade continued to grow steadily and made further progress in improving quality, increasing profits and optimising structure."

- AFP/al

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