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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Captain blames faulty brakes, motor for NY ferry accident

NEW YORK: The captain of a packed ferry that crashed into a New York City pier injuring 74 people blamed malfunctioning brakes and a faulty motor for the accident, US investigators said Thursday.

"As the boat was coming in, the captain found that the reverse thrust was not operating as anticipated," said Robert Sumwalt of the National Transportation Safety Board, which is investigating the accident.

The captain said there was also a problem with the motor on the vessel, telling investigators that at some point "both diesel engines shut off," while he steered it toward the pier, Sumwalt told reporters.

There were 326 passengers and five crew on board the ferry at the time of Wednesday's mishap.

The accident took place during the morning rush hour at Pier 11 in lower Manhattan's East River, not far from Wall Street. The ferry was arriving from New Jersey.

Sumwalt said the captain, who is 36 years old, has 12 years of experience as a ferryboat captain and tested negative for alchohol use, as did the entire crew. Results of drug testing have yet to be completed, he said.

Some witnesses reported that the ferry, the Seastreak Wall Street, was going too quickly as it approached the pier.

Weather conditions were good at the time of the accident, with hardly any wind and good visibility.

Dozens of ferries bring thousands of commuters from New Jersey or Brooklyn to Manhattan every day, but accidents are rare.

The most serious mishap, in October 2003, killed 11 people and injured 70 others when a Staten Island ferry slammed into a pier at full speed.

- AFP/ck

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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.

Read More..

Hero Teacher Talks Shooter into Dropping Gun

A California high school teacher is being hailed a hero for talking a 16-year-old shooter into putting down his gun and turning himself in after opening fire on a classroom and wounding another student, police said.

The student victim was taken to a nearby hospital and remains in critical but stable condition, Kern County Sheriff Donny Youngblood told reporters on Thursday.

The teacher, whose name has not yet been officially released by authorities, helped evacuate nearly two dozen students out a door at Taft Union High School in Taft, Calif., while calmly engaging the young gunman, who is a student at Taft Union, in conversation.

Chris McCullah/The Californian/ZUMA

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The teacher and a campus supervisor, who responded to the gunfire and arrived at the classroom, helped convince the teenager to stop shooting.

"They talked him into putting the shotgun down," Youngblood said.

The shooting began around 9 a.m. in the school's science building and sheriff's deputies were on the scene within one minute of the call. An armed security guard who is typically at the school was not on campus because he had been snowed in, the sheriff said.

Two other students received minor injuries: One reported hearing loss and the other fell over a table. The teacher was shot with a pellet, but refused medical treatment, according to police.

The school's 900 students were evacuated from the building and many of them were met by parents within minutes of the first 911 calls.

Today's shooting comes less than month after 20-year-old Adam Lanza opened fire on an elementary school in Newtown, Conn. killing 20 children and six adults.

Read More..

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."

If you would like to reuse any content from New Scientist, either in print or online, please contact the syndication department first for permission. New Scientist does not own rights to photos, but there are a variety of licensing options available for use of articles and graphics we own the copyright to.

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EU leaders want UK in union, but not treaty change

LONDON: European leaders on Wednesday stressed the importance of keeping Britain in the EU, but said they opposed treaty changes demanded by Prime Minister David Cameron.

"Britain is an essential part of the EU," Irish Prime Minister Enda Kenny said during a conference in Dublin marking the beginning of his country's six-month presidency of the bloc.

"Great Britain has great value and is a very important member of the EU," added EU President Herman Van Rompuy.

The two leaders highlighted the importance of the union for British businesses, saying that it was essential for them that Britain remained a full and active member.

A majority of Britons favour severing all ties with the union, according to polls, and Cameron is expected to deliver a speech within the next few days spelling out his views on the country's relationship with Brussels.

He insisted last year that he supported Britain's membership, but that he wanted to negotiate a "new agreement" which would allow it to opt out of certain directives.

Kenny and Van Rompuy both repeated their opposition to any treaty changes.

"I don't see a reopening of the treaties, I don't see an issue in treaty change for any individual countries," said the Irish prime minister.

Irish Deputy Prime Minister Eamon Gilmore stressed that the top concern of European citizens, "whether from Liverpool or Limerick", was unemployment.

Van Rompuy reiterated that it would be possible to change the treaties after the 2014 European elections, but added that he strongly supported deeper EU integration as opposed to an "a la carte" union.

He pointed out that there was already scope for increasing EU partnership.

"We don't need, at this stage, a treaty change," he said. "We can deliver for a deeper EU within the treaties."

- AFP/jc

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Wash your hands! Flu spreads fiercely across the U.S.

STORY HIGHLIGHTS

• Boston mayor declares a public health emergency because of flu


• Massachusetts General Hospital alone has already counted 532 cases of flu among patients


• It's not too late to get a flu vaccine


• In most cases, flu patients don't need to go to the emergency room

(CNN) -- The flu has been spreading fiercely across the United States, with more than half of states reporting widespread activity. The season has started earlier, and cases are more severe than last year, health officials say.

The latest Centers for Disease Control and Prevention flu advisory report, which covers the week of December 23 to 29, suggests that 41 states have widespread influenza activity, which was an increase of 31 states from the previous week. The CDC will issue an update on the flu situation Friday.

There have so far been 2,257 hospitalizations associated with laboratory-confirmed flu virus, the CDC report said. Among children, there have been 18 deaths reported during this season.

In Massachusetts, one of the 29 states that the CDC has identified as having high activity of influenza-like illness, Boston Mayor Thomas Menino declared a public health emergency in the city because of the flu.

Since October 1, there have been 700 confirmed influenza cases among Boston residents, according to Menino's office; that's 10 times more than were seen in all of last year's flu season.

Menino is collaborating with the Boston Public Health Commission and community health centers to offer free vaccination clinics this weekend. The mayor urged residents to stay home from work or school if they are sick, and to get their flu shots.

"This is the worst flu season we've seen since 2009, and people should take the threat of flu seriously," Menino said in a statement. More than 4% of emergency department visits at Boston hospitals are from flu cases, up from 1% during non-flu season.

Experts: Flu spreading faster than usual

Massachusetts General Hospital has already counted 532 cases of flu among patients, which is more than the hospital saw in any of the previous three flu seasons, said spokeswoman Kristen Stanton.

Signs posted throughout the hospital discourage anyone from visiting who has a cough or fever, she said, and anyone who does visit with those symptoms must wear a mask and perform hand hygiene. All staff must wear a mask when providing care for possible flu cases. Any staff member who has not been vaccinated must wear a mask while caring for any patient.

Pennsylvania has had 22 flu-related deaths so far this season, according to data from the state's Department of Health. Most of these deaths occurred among people older than 65, but the fatalities included two individuals younger than 50 who were otherwise healthy.

Lehigh Valley Hospital-Cedar Crest in Allentown, Pennsylvania, set up a heated tent outside the hospital to serve as a clinic. Anyone with mild flu symptoms can be treated quickly and discharged, isolated from more serious cases. The hospital has been seeing an additional 80 to 100 patients with flu-like symptoms daily, officials told CNN affiliate WPVI.

In Michigan, there have been four pediatric deaths related to the flu, said Angela Minicuci, public information officer for the Michigan Department of Community Health.

Dr. David Zich, internal medicine and emergency medicine physician at Northwestern Memorial Hospital in Chicago, said this is the worst flu season he's seen in his 12 years at his hospital, in terms of the concentration of patients.

Northwestern Memorial Hospital is on "bypass," which happens when it is beyond capacity because of an influx of patients, such as during flu season.

That means advanced-life support ambulances with patients who are stable are referred to the next closest hospital, no more than five minutes away, Zich said, and transfers are not accepted from outside hospitals. For everyone else, they are open for business.

"The majority of flu patients are sent home, with very little else done, so we can handle that," he said.

FDA approves new type of flu shot

Why so many cases?

Zich theorizes that one reason there are so many flu cases is that the heart of the flu season coincided with the December holiday season, meaning many people were already sleep-deprived from parties and were more likely to get sick.

Those who went to gatherings of family or friends may have already begun to feel sick, and spread the virus to others. People are generally contagious the day before symptoms start, and for five days after becoming sick, according to the Centers for Disease Control and Prevention.

Last flu season was light, but this year has brought with it some "ominous signs," Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases at the National Institutes of Health, told CNN's Wolf Blitzer Tuesday.

Flu cases started going up early, toward the end of November and the beginning of December, he said.

"And it went up on a pretty steep trajectory," he said. "The last time we saw that happen that way was the flu season of 2003 and 2004, which turned out to be a bad flu season.'

The type of flu that is going around is called H3N2, which is often linked to more serious disease compared to other flu varieties, Fauci said.

But there's good news: That type of flu matches up well to the vaccine that is being distributed and given out throughout the United States.

People may get more complications from this particular strain of H3N2, "which may make them ill for a longer period of time," Dr. Michael Jhung, medical epidemiologist in the influenza division at CDC, told CNN's Mary Snow.

Best new ways to avoid the cold and flu

"But symptoms typically last up to seven days for a normal infection, a noncomplicated infection with influenza," he said. "And we usually see that from year to year regardless of what strains are circulating."

In a "light" year, a few thousand people may still die, but a particularly serious year could see up to 49,000 deaths from the flu, Fauci said. "There's an average of about 200,000 hospitalizations and there's a lot of economic burdens."

Protect yourself

If you haven't gotten an annual flu vaccine, it's not too late, doctors say. To further protect yourself, try to avoid anyone who is sneezing and coughing, and wash your hands. Also, exercise and eat healthy foods, Zich said.

Most flu patients should not go to an emergency room, Zich said. They will likely be sent home, as there is very little that can be done for them. A fever as high as 103 degrees Fahrenheit is common in the flu.

Patients with normal flu symptoms should get a lot of rest and take painkillers to help with muscle aches, Zich said. "In five to seven days, you're going to be feeling yourself again," he said.

But there are scenarios in which going to a hospital is necessary. If a patient is short of breath, or can't keep fluids down because of nausea, these are signs of a problem that needs immediate attention, as vomiting or sweating from fever can lead to dehydration, Zich said.

Flu can be deadly, even in healthy kids

An otherwise healthy person will not get much benefit from antiviral medications designed to treat symptoms that the flu causes, Zich said. The side effects from both oseltamivir (Tamiflu) and zanamivir (Relenza) include nausea.

The CDC recommends that people who have a higher risk of complications from the flu receive antiviral treatment. These include people with chronic illnesses such as pulmonary, cardiovascular and neurological conditions, as well as anyone 65 years and older and children under age 2.

What many people don't know is that the flu vaccine becomes less effective as you get older or develop other medical problems, Zich said. The flu shot relies on the body's antibodies against the flu, so if the immune system is already compromised, it will not work as well.

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Hilda Solis stepping down as labor secretary

Hilda Solis announced that she is stepping down from her post as labor secretary, CBS News has confirmed. She sent a letter to President Obama today notifying him of her retirement.

Solis was nominated to the position the same day the president was inaugurated in 2009, serving through the president's entire first term. She ran the Labor Department during the worst economic recession since the Great Depression. The department, which calculates unemployment statistics, came under criticism during the presidential campaign for a steep drop in the jobless numbers from above 8 percent to below 8 percent right before Election Day.

President Obama called her "a critical member" of his economic team who has helped put "millions" of people back to work. "Hilda Solis has been a tireless champion for working families," the president wrote in a statement.

Before her current position, she was a member of Congress, representing California since 2001 but left that job to be the first Hispanic woman to run the agency.

The president must now name a replacement that must go through the Senate confirmation process. CBS News learned today that the president intends to nominate his chief of staff, Jack Lew, to run the Treasury Department.

Solis joins Secretary of State Hillary Clinton, Treasury Secretary Timothy Geithner, CIA Director David Petraeus and Defense Secretary Leon Panetta in stepping down from their cabinet-level posts.

A White House official says Health and Human Services Secretary Kathleen Sebelius, Veterans Affairs Secretary Eric Shinseki and Attorney General Eric Holder plan to remain in their positions.

Read More..

Arias Caught Lying to Cops in Recorded Phone Calls

Jodi Arias blatantly lied to police who asked her about Travis Alexander's death, telling them in recorded phone calls that she kept trying to call and message Alexander the week of his death but never heard back from him.

The phone calls were played as evidence during the fourth day of Arias' trial, in which she is charged with murder and could face the death penalty if convicted of killing Alexander in a "depraved and heinous" way. Arias has admitted to killing her former boyfriend, but claims it was self-defense.

During the phone conversations played in court, Arias can be heard telling Mesa, Ariz., detective Esteban Flores that she last talked to Alexander on Tuesday night, June 3, 2008, around 10 p.m. She had been in Los Angeles, about to leave to go to Utah to visit a new love interest, she said.

After June 3, he stopped calling her back, she said.

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

"On Tuesday night (I talked to him), it was brief though, 10 o'clock maybe. I'd say 10 p.m. or 9 - 9:30. I was calling people because I was bored on the road. He was nice and cordial, but kind of acting like he had hurt feelings," she said.

"I may have called him Wednesday, from the road, and I sent him a couple of text messages, and a couple of pictures," she said, though Alexander didn't pick up and his voice mailbox was full. "That's unusual. He deletes all of his messages. I didn't want to be obsessive about it because we're not together anymore and I didn't like to call too much."

According to court records, Arias, 32, actually went to Alexander's home on in Mesa on Wednesday morning. There, the pair had sex and took graphic photos of one another with Alexander's camera.

Then, Arias is believed to have killed Alexander, 30, in his shower by stabbing him, slashing his throat from ear to ear, and shooting him in the head.

In the phone conversations, Arias told Flores that she considered calling Alexander's friends when he stopped returning her calls on Wednesday, but didn't want to act like "his mother."

Alexander's friends found his body five days later with stab wounds and a bullet wound, lying in blood in his home.

Flores asked Arias if she ever considered buying a gun, she said she was too scared of handguns.

Jodi Arias/Myspace | ABC News

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"I've looked into handguns. I have a list of things I'm scared of that I'm trying to overcome," she said. "I got that from Travis, you know, to push yourself out of your comfort zone, and do things you're afraid of. But handguns are expensive and not really in my price range right now."

Arias is accused of stealing her grandmother's handgun and using it to shoot Alexander in the head during the attack.
The detective interviewed Arias by phone multiple times in June after Alexander's body was discovered by his friends on June 9.

Arias was indicted on July 9, 2008, and changed her story again before her arraignment, telling a TV news station that she was at Alexander's house when he was killed and witnessed two intruders kill him.

After she was arraigned, Arias told police she killed Alexander, but did it in self-defense. Arias's attorneys have said that Alexander was controlling and abusive toward Arias, and described him as a "sexual deviant."

In earlier testimony in court today, Arias's new love interest, Ryan Burns, testified that Arias showed up to his house on the morning of Thursday, Dec. 5, just 24 hours after she killed Alexander.

There, the pair cuddled, kissed, and watched movies, according to Burns.

Burns, who met Arias at a business conference in spring, 2008, said he exchanged frequent long phone calls and online conversations with Arias before inviting her to come visit him in West Jordan, Utah, in June. Arias lived in California at the time.

She arrived at Burns's home 24 hours after she was expected there, telling him that she got lost, drove the wrong way on a freeway for a few hours, fell asleep for awhile, and then got lost again, Burns testified today.

She never told him that she had confronted Alexander with a knife or gun and ended up killing him just hours before their date.

When she arrived, the pair quickly got physical, he testified.

"We went back to my house. We talked for awhile, and agreed that we were going to watch a movie. At some point we were talking and we kissed. Every time we started kissing it got a little more escalated. Our clothes never came off, but at some point she was kissing my neck, I was kissing hers, but our clothes never came off," he said.

Burns said that both he and Arias stopped kissing at the time, though they again became physically involved later in the evening when Arias climbed on top of Burns and began kissing him. Burns said that they stopped kissing because he did not want her to "regret the visit" because of her Mormon beliefs about sex.

He also told prosecutors upon questioning that Arias was physically strong.

"She's very fit," he said, describing their encounter when she climbed on top of him. "She's very strong. She has close to a six pack (of abs)."

Prosecutors likely asked about the strength of Arias because in testimony Tuesday Maricopa County medical examiner Kevin Horn said Alexander was stabbed so forcefully that the blade chipped his skull and his neck was cut all the way back to the spinal cord.

Burns, who is also a Mormon, said he noticed two bandages on Arias's hand when she arrived at his house, which she told him she got when a glass broke at her place of employment, Margaritaville.

During her visit, the pair also went to a business meeting and went out with Burns' friends where Burns described Arias as acting "shy" and a "little awkward."

"She was fine, she was laughing about simple little things like any other person. I never once felt like anything was wrong during the day. With a crowd she was a little awkward in social areas, but one on one she was very talkative and excitable," he said.

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