US Mom Missing in Turkey Took Side Trips

Sarai Sierra, the New York mother who disappeared in Turkey while on a solo trip, took several side excursions out of the country, but stayed in contact with her family the entire time, a family friend told ABC News.

Turkish media reported today that police were trying to establish why Sierra visited Amsterdam and Munich. Police were also trying to establish the identity of a man Sierra, 33, was chatting with on the Internet, according to local media.

Rachel Norman, a family friend, said the man was a group tour guide from the Netherlands and said Sierra stayed in regular touch with her family in New York.

Steven Sierra, Sarai's husband, and David Jimenez, her brother, arrived in Istanbul today to aid in the search.

The men have been in contact with officials from the U.S. consulate in the country and plan to meet with them as soon as they open on Tuesday, Norman said.

After that, she said Sierra and Jimenez would meet with Turkish officials to discuss plans and search efforts.

Family of Sarai Sierra|AP Photo

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Sarai Sierra was supposed to fly back to the United States on Jan. 22, but she never showed up for her flight home.

Her two boys, ages 11 and 9, have not been told their mother is missing.

Sierra, an avid photographer, left New York on Jan. 7. It was her first overseas trip, and she decided to go ahead after a friend had to cancel, her family said.

"It was her first time outside of the United States, and every day while she was there she pretty much kept in contact with us, letting us know what she was up to, where she was going, whether it be through texting or whether it be through video chat, she was touching base with us," Steven Sierra told ABC News before he departed for Istanbul.

But when it came time to pick her up from Newark Liberty International Airport in New Jersey, Sierra wasn't on board her scheduled flight.

Steven Sierra called United Airlines and was told his wife had never boarded the flight home.

Further investigation revealed she had left her passport, clothes, phone chargers and medical cards in her room at a hostel in Beyoglu, Turkey, he said.

The family is suspicious and said it is completely out of character for the happily married mother, who met her husband in church youth group, to disappear.

The U.S. Embassy in Turkey and the Turkish National Police are involved in the investigation, WABC-TV reported.

"They've been keeping us posted, from my understanding they've been looking into hospitals and sending out word to police stations over there," Steven Sierra said. "Maybe she's, you know, locked up, so they are doing what they can."

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DNA privacy: don't flatter yourself

The secrets contained in our individual genomes are less valuable than we like to believe

IMAGINE donating your DNA to a project aimed at discovering links between genes and diseases. You consent to your genome sequence being released anonymously into the public domain, though you are warned there is a remote possibility that it might one day be possible to link it back to you.

A few years later, that remote possibility comes to pass. How should you feel? This is no longer a hypothetical scenario. About 50 people who participated in a project called 1000 Genomes have been traced (see "Matching names to genes: the end of genetic privacy?").

The researchers' intentions were honourable. They have not revealed these identities, and the original data has been adjusted to make a repeat using the same technique impossible. All they wanted to do was expose privacy issues.

Consider them exposed. It is clear that genomics has entered a new phase, similar to that which social media went through a few years ago, when concerns were raised about people giving away too much personal information.

What happens when the same applies to our DNA? Having your genome open to public scrutiny obviously raises privacy issues. Employers and insurers may be interested. Embarrassing family secrets may be exposed.

But overall, personal genetic information is probably no more revealing than other sorts. In fact there are reasons to believe that it is less so: would an insurance company really go to the trouble of decoding a genome to discover a slightly elevated risk of cancer or Alzheimer's disease?

The available evidence suggests not. In 2006, Harvard University set out to sequence the genomes of 100,000 volunteers and make them publicly available, along with personal information such as names and medical records. One of the goals was to see what happens when such data is open to all. The answer seems to be "not a lot". So far this Personal Genome Project has published 148 people's full genomes. Not one volunteer has reported a privacy issue.

This is not a reason for complacency, but it suggests that our genomic secrets are less interesting to other people than we might like to believe.

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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Tony Leung tells all about "weird" relationship with Wong Kar Wai

SINGAPORE: They have worked on seven films together now, and spent countless hours in each other's company on the set.

Their latest collaboration, "The Grandmaster", took over four years to shoot.

But Hong Kong actor Tony Leung still doesn't quite understand his relationship with Hong Kong director Wong Kar Wai, who has worked with him on hits like "'In the Mood for Love" and "Chungking Express".

"It's very strange. Our relationship is weird," said Leung, when he met the Singapore media at a publicity event held at the ArtScience Museum recently.

"Actually, we don't speak much … we just have the chemistry and energy on the set. I can't say I understand him, I am trying to understand him," mused the actor, who plays martial arts legend Ip Man in the film.

"But we have fun every time and I enjoy [it] a lot, that's why we still make movies together!"

Leung explained that there has always been a little trial and error when he worked with Wong.

"You don't know how he wants you to act, and he doesn't tell you what he wants, so I just act it out and see if he likes it.

"If he doesn't say anything, then it means this works," said Leung, flashing a boyish grin.

Cuts and bruised egos?

He may not understand Wong, but Leung expressed that he "trusts" him completely, and did not fall out with Wong over the fact that Wong had cut a number of his scenes from the final version of "The Grandmaster", as some tabloids have claimed.

"I've been working with Kar Wai for 20 years. We are very good friends … this trust is built up over time," said Leung.

"How many of my scenes were cut, I haven't counted. But I don't feel it's a pity or anything special that my scenes were not used," Leung added.

"Because as an actor, it's enough that I have acted in the scene. Whether the director uses it or not, it is his production. He decides what will be the final product and how to tell the story.

"If he used everything, it would be a four to five hour film," he continued.

"You have to have a lot of trust in him. No matter what he does."

"So I don't feel it's a pity, though the audience may feel that way because they won't have a chance to see the stuff that has been cut."

Standing out

Although audiences will probably have to wait for the DVD or Blu-Ray release of "The Grandmaster" to catch a glimpse of some of the deleted scenes, the cinema version of the film has quite a bit to keep their attention, from philosophical soliloquys, to carefully orchestrated fight scenes.

But will it be enough to make "The Grandmaster", which opens in Singapore on Thursday, stand out from the rash of Ip Man films that have surfaced in recent years?

When asked how "The Grandmaster" stacks up against the popular "Ip Man" trilogy, which starred Hong Kong actor Donnie Yen, Leung said it is "unfair" to compare them.

"They are like works from two different painters. You can't compare them because their techniques are different and their focus is different," said Leung diplomatically.

"So it's unfair to everyone to compare them. Each has its own unique points."

-CNA/ha

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In charred club, cell phones ring with calls for the dead

Hundreds dead in Brazil nightclub fire

Hundreds dead in Brazil nightclub fire

Hundreds dead in Brazil nightclub fire

Hundreds dead in Brazil nightclub fire

Hundreds dead in Brazil nightclub fire

Hundreds dead in Brazil nightclub fire

Hundreds dead in Brazil nightclub fire

Hundreds dead in Brazil nightclub fire

Hundreds dead in Brazil nightclub fire

Hundreds dead in Brazil nightclub fire

Hundreds dead in Brazil nightclub fire

Hundreds dead in Brazil nightclub fire

Hundreds dead in Brazil nightclub fire

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STORY HIGHLIGHTS

• Cell phones left in the club ring, go unanswered amid the ruins


• The club's license had expired in August and had not been renewed


• At least 80 of those killed were students at the Federal University of Santa Maria

Are you there? Share your story.

Santa Maria, Brazil (CNN) -- Workers combing through the charred wreckage of Kiss nightclub in southern Brazil on Sunday encountered the eerie sound of ringing cell phones.

Glauber Fernandes, a reporter from CNN affiliate Band News, explains.

"It was a really complicated scene. A lot of smoke, a lot of shoes that was left, cell phones, because everybody tried to get out of there running," he said. "While we were there, we saw the cell phones were ringing. It was parents, friends, trying to know about what was happening and nobody was answering."

A fire swept through the packed, popular nightclub in Santa Maria early Sunday, killing at least 233 people -- enough to fill a large plane -- Brazilian Health Minister Alexandro Padilha told reporters. Of those, 185 have been identified so far.

Many apparently died from smoke inhalation. Others were trampled in the rush for the exits, one security guard told Band News.

More than 90 people were hospitalized, Padilha said, including 14 patients with severe burns.

Deadly blazes: Nightclub tragedies in recent history

About 2,000 people were inside the club when the fire broke out -- double the maximum capacity of 1,000, said Guido de Melo, a state fire official.

Investigators have received preliminary information that security guards stopped people from exiting the club, he told Globo TV.

"People who were inside the facility informed us ... that security guards blocked the exit to prevent people there from leaving, and that's when the crowd starting panicking, and the tragedy grew worse," he said.

The fire started "from out of nowhere" on a stage at the club and quickly spread to the ceiling, witness Jairo Vieira told Band News.

"People started running," survivor Luana Santos Silva told Globo TV. "I fell on the floor."

There was a pyrotechnics show going on inside the club when the fire started. Authorities stopped short of blaming it for the blaze, saying the cause was still under investigation.

The Kiss nightclub is popular with young people in Santa Maria, which is home to a number of universities and colleges, including the Federal University of Santa Maria. At least 80 of those killed Sunday were students at that school, it said.

The blaze broke out during a weekend when students were celebrating the end of summer. Many universities are set to resume classes on Monday.

Video from the scene showed firefighters shooting streams of water at the club and shirtless men trying to break down a wall with axes.

Smoke billowed outside the front of the building as the stench of fire filled the air, said Max Muller, who was riding by on his motorbike when he saw the blaze.

Muller recorded video of a chaotic scene outside the club, which showed emergency crews tending to victims and dazed clubgoers standing in the street. Bodies lay on the ground beside ambulances.

Friends who were inside the club told him that many struggled to find the exits in the dark. Muller, who was not inside the club Sunday morning but has been there twice before, said there were no exit signs over the doors. It is rare to see such signs in Brazilian clubs.

Valderci Oliveira, a state lawmaker, told Band News that he saw piles of bodies in the club's bathroom when he arrived at the scene hours after the blaze. It looked "like a war zone," he said.

Read more: How to protect yourself in a crowd

Police told Band News that 90% of the victims were found in that part of the club.

The roof collapsed in several parts of the building, trapping many inside, said Fernandes, the reporter from Band News.

For others, escaping was complicated by the fact that guards initially stopped people from leaving, he said, echoing comments from the state fire official.

"Some guards thought at first that it was a fight, a huge fight that happened inside the club and closed the doors so that the people could not leave without paying their bills from the club," Fernandes said.

The deadly fire is sure to shine a spotlight on safety in Brazil, which is set to host the World Cup next year and the Olympics in 2016.

Many wept as they searched for information outside a local gymnasium where bodies were taken for identification later Sunday. Inside, Brazilian President Dilma Rousseff met with family members and friends as they waited on bleachers for word of their loved ones.

Rousseff became teary-eyed as she spoke of the fire to reporters in Chile earlier Sunday. She had been attending a regional summit there, but cut short the trip and returned to Brazil early to deal with the aftermath of the tragedy.

"The Brazilian people are the ones who need me today," she said. "I want to tell the people of Santa Maria in this time of sadness that we are all together."

The fire started around 2 a.m. after the acoustic insulation in the Kiss nightclub caught fire, said Civil Defense Col. Adilomar Silva.

An accordionist who had been performing onstage with a band when the blaze broke out was among the dead, drummer Eliel de Lima told Globo TV.

Police were questioning the club's owner and interviewing witnesses as part of an investigation into what caused the blaze, state-run Agencia Brasil reported.

The club's license had expired in August and had not been renewed, local fire official Moises da Silva Fuchs told Globo TV.

The incident called to mind a 2003 nightclub fire in Rhode Island where pyrotechnics used by the heavy metal band Great White ignited a blaze that killed 100 people.

Pyrotechnics were also involved in a 2004 nightclub fire in Argentina that killed 194 people and a 2009 explosion at a nightclub in Russia that left more than 100 dead.

Shasta Darlington reported from Santa Maria, Brazil. Marilia Brocchetto and Dana Ford reported from Atlanta. CNN's Catherine E. Shoichet, Helena DeMoura and Samira Jafari contributed to this report.

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Massive loss of life in Brazil nightclub fire

Last Updated 10:16 p.m. ET

BRASILIA, Brazil Flames raced through a crowded nightclub in southern Brazil early Sunday, killing more than 230 people as panicked partygoers gasped for breath in the smoke-filled air, stampeding toward a single exit partially blocked by those already dead. It appeared to be the world's deadliest nightclub fire in more than a decade.

Firefighters responding to the blaze at first had trouble getting inside the Kiss nightclub because bodies partially blocked the club's entryway.

Witnesses said a flare or firework lit by band members started the blaze in Santa Maria, a university city of about 260,000 people. Officials at a news conference said the cause was still under investigation — though police inspector Sandro Meinerz told the Agencia Estado news agency the band was to blame for a pyrotechnics show and that manslaughter charges could be filed.

17 Photos

More than 200 die in Brazil nightclub fire

Television images showed smoke pouring out of the Kiss nightclub as shirtless young men who had attended a university party joined firefighters using axes and sledgehammers to pound at windows and walls to free those trapped inside.

There was only one way out of the nightclub, and no emergency doors, reports CBS News correspondent Margaret Brennan. Some panicked patrons mistook the bathrooms for an escape and died there.

The chaos led to confusion -- security guards briefly blocked the exit fearing that customers were fleeing their bar tabs. Brazilian bars routinely make patrons pay their entire tab at the end of the night before they are allowed to leave.

Bodies of the dead and injured were strewn in the street and panicked screams filled the air as medics tried to help. There was little to be done; officials said most of those who died were suffocated by smoke within minutes.

Within hours a community gym was a horror scene, with body after body lined up on the floor, partially covered with black plastic as family members identified kin.

Outside the gym police held up personal objects — a black purse, a blue high-heeled shoe — as people seeking information on loved ones looked crowded around, hoping not to recognize anything being shown them.

Guido Pedroso Melo, commander of the city's fire department, told the O Globo newspaper that firefighters had a hard time getting inside the club because "there was a barrier of bodies blocking the entrance."

Teenagers sprinted from the scene desperately seeking help. Others carried injured and burned friends away in their arms.

"There was so much smoke and fire, it was complete panic, and it took a long time for people to get out, there were so many dead," survivor Luana Santos Silva told the Globo TV network.

The fire spread so fast inside the packed club that firefighters and ambulances could do little to stop it, Silva said.

A man carries an injured man, victim of a fire at the Kiss club in Santa Maria, Brazil, early Sunday, Jan. 27, 2013.

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AP Photo/Agencia RBS

Another survivor, Michele Pereira, told the Folha de S. Paulo newspaper that she was near the stage when members of the band lit flares that started the conflagration.

"The band that was onstage began to use flares and, suddenly, they stopped the show and pointed them upward," she said. "At that point, the ceiling caught fire. It was really weak, but in a matter of seconds it spread."

Guitarist Rodrigo Martins told Radio Gaucha that the band, Gurizada Fandangueira, started playing at 2:15 a.m. "and we had played around five songs when I looked up and noticed the roof was burning"

"It might have happened because of the Sputnik, the machine we use to create a luminous effect with sparks. It's harmless, we never had any trouble with it.

"When the fire started, a guard passed us a fire extinguisher, the singer tried to use it but it wasn't working"

He confirmed that accordion player Danilo Jacques, 28, died, while the five other members made it out safely.

Police Maj. Cleberson Braida Bastianello said by telephone that the toll had risen to 233 with the death of a hospitalized victim. Officials counted 232 bodies that had been brought for identification to a gymnasium in Santa Maria, a major university city with about 250,000 residents at the southern tip of Brazil, near the borders with Argentina and Uruguay.

An earlier count put the number of dead at 245.

Federal Health Minister Alexandre Padhilha told a news conference that most of the 117 people treated in hospitals had been poisoned by gases they breathed during the fire. Only a few suffered serious burns, he said.

Brazil President Dilma Roussef arrived to visit the injured after cutting short her trip to a Latin American-European summit in Chile.

"It is a tragedy for all of us," Roussef said.

Most of the dead apparently suffocated, according to Dr. Paulo Afonso Beltrame, a professor at the medical school of the Federal University of Santa Maria who went to the city's Caridade Hospital to help victims.

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'Barrier of Bodies' Trapped Nightclub Fire Victims

A fast-moving fire roared through a crowded, windowless nightclub in southern Brazil early Sunday, filling the air in seconds with flames and a thick, toxic smoke that killed more than 230 panicked partygoers, many of whom were caught in a stampede to escape.

Inspectors believe the blaze began when a band's small pyrotechnics show ignited foam sound insulating material on the ceiling, releasing a putrid haze that caused scores of university students to choke to death. Most victims died from smoke inhalation rather than burns in what appeared to be the world's deadliest nightclub fire in more than a decade.

Survivors and the police inspector Marcelo Arigony said security guards briefly tried to block people from exiting the club. Brazilian bars routinely make patrons pay their entire tab at the end of the night before they are allowed to leave.

But Arigony said the guards didn't appear to block fleeing patrons for long. "It was chaotic and it doesn't seem to have been done in bad faith because several security guards also died," he told The Associated Press.

Later, firefighters responding to the blaze initially had trouble getting inside the Kiss nightclub because "there was a barrier of bodies blocking the entrance," Guido Pedroso Melo, commander of the city's fire department, told the O Globo newspaper.

Germano Roratto/AFP/Getty Images

Brazil Nightclub Fire: Nearly 200 People Killed Watch Video

Authorities said band members who were on the stage when the fire broke out later talked with police and confirmed they used pyrotechnics during their show.

Police inspector Sandro Meinerz, who coordinated the investigation at the nightclub, said one band member died after escaping because he returned inside the burning building to save his accordion. The other band members escaped alive because they were the first to notice the fire.

"It was terrible inside — it was like one of those films of the Holocaust, bodies piled atop one another," said Meinerz. "We had to use trucks to remove them. It took about six hours to take the bodies away."

Television images from Santa Maria, a university city of about 260,000 people, showed black smoke billowing out of the Kiss nightclub as shirtless young men who attended the university party joined firefighters using axes and sledgehammers to pound at the hot-pink exterior walls, trying to reach those trapped inside.

Bodies of the dead and injured were strewn in the street and panicked screams filled the air as medics tried to help. There was little to be done; officials said most of those who died were suffocated by smoke within minutes.

Within hours a community gym was a horror scene, with body after body lined up on the floor, partially covered with black plastic as family members identified kin.

Outside the gym police held up personal objects — a black purse, a blue high-heeled shoe — as people seeking information on loved ones crowded around, hoping not to recognize anything being shown them.

Teenagers sprinted from the scene after the fire began, desperately seeking help. Others carried injured and burned friends away in their arms. Many of the victims were under 20 years old, including some minors. About half of those killed were men, about half women.

The party was organized by students from several academic departments from the Federal University of Santa Maria. Such organized university parties are common throughout Brazil.

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Get cirrus in the fight against climate change

FEATHERY cirrus clouds are beautiful, but when it comes to climate change, they are the enemy. Found at high-altitude and made of small ice crystals, they trap heat - so more cirrus means a warmer world. Now it seems that, by destroying cirrus, we could reverse all the warming Earth has experienced so far.

In 2009, David Mitchell of the Desert Research Institute in Reno, Nevada, proposed a radical way to stop climate change: get rid of some cirrus. Now Trude Storelvmo of Yale University and colleagues have used a climate model to test the idea.

Storelvmo added powdered bismuth triiodide into the model's troposphere, the layer of the atmosphere in which these clouds form. Ice crystals grew around these particles and expanded, eventually falling out of the sky, reducing cirrus coverage. Without the particles, the ice crystals remained small and stayed up high for longer.

The technique, done on a global scale, created a powerful cooling effect, enough to counteract the 0.8 °C of warming caused by all the greenhouse gases released by humans (Geophysical Research Letters, DOI: 10.1002/grl.50122).

But too much bismuth triiodide made the ice crystals shrink, so cirrus clouds lasted longer. "If you get the concentrations wrong, you could get the opposite of what you want," says Storelvmo. And, like other schemes for geoengineering, side effects are likely - changes in the jet stream, say.

Different model assumptions give different "safe" amounts of bismuth triiodide, says Tim Lenton of the University of Exeter, UK. "Do we really know the system well enough to be confident of being in the safe zone?" he asks. "You wouldn't want to touch this until you knew."

Mitchell says seeding would take 140 tonnes of bismuth triiodide every year, which by itself would cost $19 million.

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.

All comments should respect the New Scientist House Rules. If you think a particular comment breaks these rules then please use the "Report" link in that comment to report it to us.

If you are having a technical problem posting a comment, please contact technical support.

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Thousands march in Washington for gun control

WASHINGTON: Thousands of people marched in Washington to demand stronger gun control legislation, in a solemn rally six weeks after the shock massacre of young children at a Connecticut school.

Protesters, backed by senior officials, marched in silence for around 30 minutes along the National Mall near the US Capitol and Washington Monument, carrying white placards marked with the names and pictures of gun crime victims.

The demonstration came after the December shooting at Sandy Hook Elementary School in Newtown, Connecticut that saw a gunman mow down 20 young children and six adults, sparking a furious national debate over gun ownership. The shooter used a military-style assault weapon and handguns.

"No more talk. We must act, we must act, we must act," Education Secretary Arne Duncan said, telling the crowd that when he headed up a network of Chicago schools from 1990 to 2000, a child was buried every two weeks due to gun violence.

"This has to change. Our children, our families, our communities, our country deserve better," he said to thunderous applause.

Around 270 million guns are in circulation in the United States -- almost one weapon for every man, woman and child -- where more than 32,000 people were fatally gunned down in 2011 alone.

Among the protesters were several friends, neighbors and relatives of the Newtown shooting victims.

Under chilly temperatures, the demonstrators held banners reading "Ban Assault Weapons Now" and "My children are more important than your guns."

Colin Goddard, survivor of the 2007 shooting at Virginia Tech university that left 33 people dead including the gunman, said the latest spate of gun violence should trigger change.

"Enough is enough," he said. "Today is not the finish line, today is the starting block. This is not an individual race, but this is a team relay."

Washington Mayor Vincent Gray, who has come out in support of gun control, called for action to keep "each other safe from arms those irresponsible and irrational people who still go across our cities and our states and have access to guns in ways that they should not."

Duncan pledged that President Barack Obama's administration "will do everything in our power to make sure that we pass legislation that makes our children, our families, our communities safer."

In the wake of the Connecticut deaths, Obama signed 23 executive orders and also called on Congress to pass new laws in a series of sweeping measures aimed at addressing gun violence.

The proposed measures include a ban on military-style assault rifles and the closing of loopholes that allow many gun buyers to avoid background checks.

But securing congressional action will be difficult as many Republicans are vehemently opposed to the White House's plans, contending that the measures will infringe upon the constitutional right to bear arms.

Opposition to new laws is not purely along party lines. Some Democrats from states where hunting and shooting sports are popular support gun rights.

An ABC News poll this week found 53 percent of Americans back Obama's gun control plans, while 41 percent view it unfavorably.

"We know the fight will be difficult but that we will prevail," said march organizer Molly Smith.

- AFP/fa

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Bloomberg's giving to his alma mater tops $1B

New York Mayor Michael Bloomberg graduated from Johns Hopkins University in 1964.

STORY HIGHLIGHTS

• NYC mayor's latest gift to John Hopkins is $350 million


• That makes for a total of $1.1 billion over 45 years


• Donation will go toward a "transformational" academic initiative


• Bloomberg took out loans to attend Hopkins in the 1960s

(CNN) -- A kid raised in a middle-class Boston suburb, Michael Bloomberg took out loans to pay for his tuition at Johns Hopkins University and worked as a parking lot attendant.

He learned early to pay it forward.

Bloomberg's first gift to his alma mater was a whopping $5 in 1965, a year after he graduated with a bachelor's degree in engineering.

Fast forward to Saturday, when the Baltimore university announced Bloomberg has now given a total of $1.1 billion. The latest commitment came in the form of a cool $350 million toward a "transformational" initiative aimed at cross-discipline solutions to societal problems.

In a statement, Johns Hopkins said Bloomberg, a former trustee, is believed to be the first person to ever reach the $1 billion level of giving to a single U.S. institution of higher education.

The university's Twitter feed was aglow with information on the gift. One tweet heralded the announcement with the words, "Big News," which might have been an understatement.

Among other things, the donation will fund 2,600 Bloomberg Scholarships over 10 years and 50 distinguished scholars.

Of the $350 million, $100 million will go toward "need-based financial aid" for undergraduate students.

"Johns Hopkins University has been an important part of my life since I first set foot on campus more than five decades ago," Bloomberg said in the press release. "Each dollar I have given has been well-spent improving the institution and, just as importantly, making its education available to students who might otherwise not be able to afford it."

The remarkable tally speaks to the generosity and success of New York City's mayor, who grew a business empire after leaving Baltimore. He will turn 71 on Valentine's Day.

Bloomberg earned an MBA from Harvard Business School. He was hired by the Wall Street firm Salomon Brothers in 1966, according to his biography on NYC's website.

After he was let go from Salomon when it was acquired in 1981, the budding entrepreneur used his information systems expertise to launch Bloomberg LP, which provided advanced computer systems for traders and financial firms. Bloomberg's media interests followed and the company now has more than 15,000 employees worldwide, according to his biography.

Bloomberg eventually devoted his energies to philanthropy and politics. He was elected mayor of the Big Apple in 2001 and has held the office since.

His first $1 million commitment to Johns Hopkins was made in 1984, 20 years after graduation, in honor of his mother, Charlotte.

The university's president, Ronald J. Daniels, said Saturday's announced gift "illustrates Mike's passion for fixing big problems quickly and efficiently. It will ensure not only that Johns Hopkins helps to solve humanity's problems, but also that it leads the world's universities in showing how it should be done."

The mayor's overall giving includes $240 million for capital and infrastructure improvements, $219 million for student financial aid and $336 million for research.

"Giving is only meaningful if the money will make a difference in people's lives," said Bloomberg. "And I know of no other institution that can make a bigger difference in lives around the world through its groundbreaking research -- especially in the field of public health."

CNN's Erinn Cawthon and Phil Gast contributed to this report.

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At least 5 die in Chicago shootings

CHICAGO Authorities are investigating the shooting deaths of five people in a single day of bloodshed in Chicago.

Police Officer Daniel O'Brien says Saturday's first killing occurred at around 2:15 a.m. on the city's west side when a gunman opened fire on two men who were sitting in a parked car, killing one and wounding the other.

Investigators say a few hours later, someone opened fire on three men near a South Side eatery, killing two of them and wounding the third.

Detectives were called to the scene of another shooting Saturday afternoon in which a man in his 30s and a teenager were shot to death. There had been no arrests.

Chicago's homicide count eclipsed 500 last year for the first time since 2008.

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