For Web Images, Creating New Technology to Seek and Find

STANFORD, Calif. — You may think you can find almost anything on the Internet.

But even as images and video rapidly come to dominate the Web, search engines can ordinarily find a given image only if the text entered by a searcher matches the text with which it was labeled. And the labels can be unreliable, unhelpful (“fuzzy” instead of “rabbit”) or simply nonexistent.

To eliminate those limits, scientists will need to create a new generation of visual search technologies — or else, as the Stanford computer scientist Fei-Fei Li recently put it, the Web will be in danger of “going dark.”

Now, along with computer scientists from Princeton, Dr. Li, 36, has built the world’s largest visual database in an effort to mimic the human vision system. With more than 14 million labeled objects, from obsidian to orangutans to ocelots, the database has because a vital resource for computer vision researchers.

The labels were created by humans. But now machines can learn from the vast database to recognize similar, unlabeled objects, making possible a striking increase in recognition accuracy.

This summer, for example, two Google computer scientists, Andrew Y. Ng and Jeff Dean, tested the new system, known as ImageNet, on a huge collection of labeled photos.

The system performed almost twice as well as previous “neural network” algorithms — software models that seek to replicate human brain functions.

Nor are the Google researchers the only ones who have used the ImageNet database to test their algorithms; since 2009, more than 300 scientific publications have used or cited it.

Computer vision is one of the thorniest problems facing designers of artificial intelligence and robots. A huge portion of the human brain is devoted to vision, and scientists are still struggling to unlock the biological mechanisms by which humans learn to recognize objects. “My dream has long been to build a vision system that recognizes the world the way that humans do,” said Dr. Li, whose Princeton colleague is the computer scientist Kai Li (they are not related).

When she began to assemble her system in 2007, Fei-Fei Li said, the only alternatives were “toy” research databases that recognized only a handful of types of objects. The challenge was how to increase the scale of the system to bring it closer to human capabilities, especially amid the rising torrent of online images.

“In age of the Internet, we are suddenly faced with an explosion in terms of imagery data,” she said. “Facebook has 200 billion images, and people are now uploading 72 hours of new video every minute on YouTube.”

Dr. Li did a quick back-of-envelope calculation and determined that if she gave the task to one of her graduate students, it could take decades.

Luckily, while the Internet has given rise to a mountainous digital haystack of imagery, it also offers a path to clarity.

Dr. Li realized that Mechanical Turk, the Amazon.com system for organizing thousands of humans to do small tasks like describing the contents of a picture, was the perfect way to assemble her database.

Using available university research funds, the ImageNet visual database project has now become the world’s largest academic user of Mechanical Turk workers, who are known as “turkers.” Each year, ImageNet employs 20,000 to 30,000 people who are automatically presented with images to label, receiving a tiny payment for each one.

The average turker can identify about 250 images in five minutes. The ImageNet database now has 14,197,122 images, indexed into 21,841 categories.

“Its size is by far much greater than anything else available in the computer vision community, and thus helped some researchers develop algorithms they could never have produced otherwise,” said Samy Bengio, a Google research scientist.

He added that ImageNet was not perfect. To organize the vast collection of images, Dr. Li uses WordNet, a database of English words designed by the Princeton psychologist George A. Miller, who died in July at 92. For Dr. Bengio, its categories are a little too elevated.

“I would have preferred if the categories chosen in ImageNet were more reflecting the distribution of interests of the population,” he said. “Most people are more interested in Lady Gaga or the iPod Mini than in this rare kind of diplodocus.”

Still, the project goes on. Jia Deng, one of Dr. Li’s graduate students, has developed an image classifier he jokingly calls infallible. Because WordNet is organized as a hierarchy of categories, the software can simply choose a level of abstraction where it has a very high probability of being correct: if it is not sure a given picture shows a rabbit, for instance, it goes to the next level (mammals) or the one above that (animals).

At one of those levels, it will almost certainly not be wrong. And Dr. Li says she expects further advances that allow ever more accuracy.

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Well’s Vegetarian Thanksgiving 2012

Every fall, Well goes vegetarian for Thanksgiving, taking the meaty bird off the table to make room for a spectacular array of vegetarian soups, sides, main courses, salads and desserts. So get ready to save a turkey and savor the flavors of the fall harvest.
Every day until Thanksgiving, we will add more vegetarian recipes for your holiday table. Click on a photo to learn more about each recipe.

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Well’s Vegetarian Thanksgiving 2012

Every fall, Well goes vegetarian for Thanksgiving, taking the meaty bird off the table to make room for a spectacular array of vegetarian soups, sides, main courses, salads and desserts. So get ready to save a turkey and savor the flavors of the fall harvest.
Every day until Thanksgiving, we will add more vegetarian recipes for your holiday table. Click on a photo to learn more about each recipe.

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Blue Laws Curb Consumerism Where Pilgrims Gave Thanks

Charlie Mahoney for The New York Times

The annual Thanksgiving celebration in Plymouth, Mass., is held the weekend before the holiday, so as not to interfere.

PLYMOUTH, Mass. — Here in the birthplace of Thanksgiving, where the Pilgrims first gave thanks in 1621 for their harvest and their survival, some residents are giving thanks this year for something else: the Colonial-era blue laws that prevent retailers from opening their doors on the fourth Thursday of November.

Charlie Mahoney for The New York Times

Participants in Saturday's town parade.

While shoppers in the rest of the country will skip out on Thanksgiving to go to Walmart or Kmart or other big-box stores, William Wrestling Brewster, whose ancestors arrived on the Mayflower and participated in that first Thanksgiving, will limit his activities to enjoying a traditional meal here with his extended family at his parents’ house.

“Thanksgiving is supposed to be about giving thanks for all you have,” said Mr. Brewster, 47, who runs a computer repair business. “I cringe to think what society is doing to itself,” he said of the mercantile mania that threatens one of the least commercial holidays.

Some of the nation’s biggest retailers — Sears, Target and Toys “R” Us among them — announced this month that they would be moving up their predawn Black Friday door-buster sales to Thanksgiving Day or moving up their existing Thanksgiving sales even earlier on Thursday. Walmart, which has already been open on Thanksgiving for many years, is advancing its bargain specials to 8 p.m. Thursday from 10 p.m.

But in Maine, Massachusetts and Rhode Island, the stores will sit dark until the wee hours of Friday. Even Walmart will not open in Maine until just after midnight Friday or in Massachusetts or Rhode Island until 1 a.m.

New England’s blue laws were put down by early settlers to enforce proper behavior on Sundays. (The origin of the term is unclear. Some have said the laws were printed on blue paper, while others have said the word “blue” was meant to disparage those like the “blue noses” who imposed rigid moral codes on others.)

Over decades, many of those laws — which banned commerce, entertainment and the sale of alcohol, among other things — were tossed aside or ignored, or exemptions were granted. In some cases, the statutes were extended to holidays and barred retailers specifically from operating on Thanksgiving or Christmas.

Maine granted an exception to L. L. Bean, whose store in Freeport is open around the clock every day, including Christmas. When the blue laws, which had faded, were revived in the 1950s, the store in Freeport was already operating 24/7, said Carolyn Beem, a spokeswoman. She said that the store, which originally catered to hunters and fishermen who shopped at odd hours, was grandfathered in and allowed to stay open on the holidays.

Nationwide, a protest is developing against Thanksgiving Day sales. Workers at some stores have threatened to strike, saying the holiday openings were disrupting their family time. Online petitions have drawn hundreds of thousands of signatures protesting the move. The stores say that many of their workers have volunteered to work on the holiday, when they will get extra pay, and that consumers wanted to shop early. It is not yet clear what effect the protests might have.

At the same time, this corner of New England is serving as something of a bulwark against the forces of commercialism.

Even the Retailers Association of Massachusetts is treading gently on the notion of Thanksgiving sales.

“There hasn’t been any outcry from our members over the years pushing this,” said Bill Rennie, vice president of the association.

But, as Thanksgiving shopping becomes more common, he said, “it may be time to have a discussion about it.”

Blue laws seem anachronistic when people can shop anytime online, he said.

There is also the case of simple economics. These states are already at risk of losing sales to stores in New Hampshire, which has no sales tax. Now, Mr. Rennie pointed out, they could lose even more in the holiday bargain rush when stores in New Hampshire are open and stores here are closed.

Still, Barry Finegold, a Massachusetts state senator whose district abuts New Hampshire, said that so far, none of the retailers in his district had asked for a change in the law.

This article has been revised to reflect the following correction:

Correction: November 20, 2012

An earlier version of this article misstated William Wrestling Brewster’s occupation. He runs a computer repair business, not a computer store.

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Clinton to Visit Middle East in Effort to Defuse Gaza Conflict

PHNOM PENH, Cambodia — President Obama sent Secretary of State Hillary Rodham Clinton to the Middle East on Tuesday to try to defuse the conflict in Gaza, the White House announced.

Mrs. Clinton, who accompanied Mr. Obama on his three-country Asia trip, left on her own plane immediately for the region, where she will stop first in Jerusalem to meet with Prime Minister Benjamin Netanyahu of Israel, then head to the West Bank to meet with Palestinian leaders and finally to Cairo to consult with Egyptian officials.

The decision to dispatch Mrs. Clinton dramatically deepens the American involvement in the crisis. Mr. Obama made a number of late-night phone calls from his Asian tour to the Middle East on Monday night that contributed to his conclusion that he had to become more engaged and that Mrs. Clinton might be able to accomplish something.

With Ban Ki-moon, the United Nations secretary general, also scheduled to arrive in Israel on Tuesday, a senior official in the prime minister’s office said Israel decided to give more time to diplomacy before launching a ground invasion into Gaza. But Israel has not withdrawn other options.

“I prefer a diplomatic solution,” Mr. Netanyahu said in a statement at the start of a meeting in Jerusalem with the German foreign minister, Guido Westerwelle. “I hope that we can get one but if not, we have every right to defend ourselves with other means and we shall use them.” “As you know, we seek a diplomatic unwinding to this, through the discussions of cease-fire,” Mr. Netanyahu added. “But if the firing continues, we will have to take broader action and we won’t hesitate to do so.”

About three hours before Mr. Ban was scheduled to meet Mr. Netanyahu in Jerusalem, sirens sounded across the city in the early afternoon announcing an incoming rocket from Gaza. The military wing of Hamas said it had fired at the city. The rocket fell short, landing harmlessly in the West Bank just south of Jerusalem, and the military said it landed on open ground near a Palestinian village.

The rocket attack on the city, which is holy to Jews, Muslims and Christians, was the second in less than a week. The earlier rocket on Friday landed in a similar location, the police said.

The Israeli military said that in the course of the morning its air force had struck at 11 Palestinian squads involved in planting explosives and firing rockets, as well as underground rocket launchers and a store of weapons and ammunition. The military said it had also used tank shells and artillery fire against unspecified targets in Gaza.  

The Health Ministry in Gaza said the Palestinian death toll had climbed by late Tuesday morning to 112, roughly half of the dead civilians, including children. Three Israelis died in a rocket attack last week.

After an Asian summit dinner in Phnom Penh on Monday night, Mr. Obama called President Mohamed Morsi of Egypt to discuss the situation, then spoke with Mr. Netanyahu and called Mr. Morsi back. He was up until 2:30 a.m. on the phone, the White House said. He consulted with Mrs. Clinton repeatedly on the sidelines of the Asian summit meetings on Tuesday.

“This morning, Secretary Clinton and the president spoke again about the situation in Gaza, and they agreed that it makes sense for the secretary to travel to the region so Secretary Clinton will depart today,” said Benjamin Rhodes, a deputy national security adviser to Mr. Obama. “Her visits will build on the engagement that we’ve undertaken in the last several days.”

Mr. Rhodes said, “Any resolution to this has to include an end to that rocket fire” by Hamas militants on Israeli communities but “the best way to solve this is through diplomacy.”

He added, “It’s in nobody’s interest to see an escalation of the military conflict.”

Mrs. Clinton will not meet with Hamas representatives on her trip, but with the Palestinian leadership in the West Bank, which is at odds with the Hamas rulers of the Gaza Strip. “We do not engage directly with Hamas,” Mr. Rhodes said.

Instead, Mr. Obama is focused on leveraging Egypt’s influence with Hamas to press for a halt to the rocket attacks. “We believe Egypt can and should be a partner in achieving that outcome,” Mr. Rhodes said.

Mr. Rhodes reaffirmed that the United States supports Israel’s right to defend itself and said Mr. Obama did not ask Mr. Netanyahu to hold off a ground incursion into Gaza.

In Jerusalem, an official in the prime minister’s office said the country’s top nine ministers, who make up the inner security cabinet, held discussions late into the night on the state of the diplomatic efforts and Israel’s military operation in Gaza. The goal of the operation, Israel says, is to end years of rocket fire by Gaza militants against southern Israel.

Peter Baker reported from Phnom Penh, Cambodia, and Isabel Kershner from Jerusalem. Jodi Rudoren contributed reporting from Gaza City.

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Virtual U.: Colleges Turn to Crowd-Sourcing Courses

Ozier Muhammad/The New York Times

Prof. Mitchell Duneier of Princeton is adapting his classroom teaching style for an online audience of tens of thousands.

Teaching Introduction to Sociology is almost second nature to Mitchell Duneier, a professor at Princeton: he has taught it 30 times, and a textbook he co-wrote is in its eighth edition. But last summer, as he transformed the class into a free online course, he had to grapple with some brand-new questions: Where should he focus his gaze while a camera recorded the lectures? How could the 40,000 students who enrolled online share their ideas? And how would he know what they were learning?

This is the first article in a series that will examine free online college-level classes and how they are transforming higher education.

Ozier Muhammad/The New York Times

Prof. Mitchell Duneier, who transformed a Princeton class into an online one.

In many ways, the arc of Professor Duneier’s evolution, from professor in a lecture hall to online instructor of tens of thousands, reflects a larger movement, one with the potential to transform higher education. Already, a handful of companies are offering elite college-level instruction — once available to only a select few, on campus, at great cost — free, to anyone with an Internet connection.

Moreover, these massive open online courses, or MOOCs, harness the power of their huge enrollments to teach in new ways, applying crowd-sourcing technology to discussion forums and grading and enabling professors to use online lectures and reserve on-campus class time for interaction with students.

The spread of MOOCs is likely to have wide fallout. Lower-tier colleges, already facing resistance over high tuition, may have trouble convincing students that their courses are worth the price. And some experts voice reservations about how online learning can be assessed and warn of the potential for cheating.

MOOCs first landed in the spotlight last year, when Sebastian Thrun, a Stanford professor, offered a free artificial-intelligence course, attracting 160,000 students in 190 nations. The resulting storm of publicity galvanized elite research universities across the country to begin to open higher education to everyone — with the hope of perhaps, eventually, making money doing so.

The expansion has been dizzying. Millions of students are now enrolled in hundreds of online courses, including those offered by Udacity, Mr. Thrun’s spinoff company; edX, a joint venture of Harvard and the Massachusetts Institute of Technology; and Coursera, a Stanford spinoff that is offering Professor Duneier’s course and 200 others.

No one knows just how these massive courses will evolve, but their appeal to a broad audience is unquestioned: retirees in Indiana see them as a route to lifelong learning, students in India as their only lifeline to college-level work.

The professors involved face new challenges. “It was really intimidating at the beginning to do these lectures with no live audience, no sense of who was listening and how they were reacting,” Professor Duneier said. “I talk about things like racial differences in I.Q., Abu Ghraib and public bathrooms, and I worried that my lectures might come across as examples of American ethnocentrism.”

Feedback came quickly. When his first lecture went online, students wrote hundreds, then thousands, of comments and questions in online discussion forums — far too many for Professor Duneier to keep up with. But crowd-sourcing technology helped: every student reading the forum could vote questions and comments up or down, allowing him to spot important topics and tailor his lectures to respond.

Bigger Audiences

Top universities with courses like Professor Duneier’s stand to gain, both in prestige and in their ability to refine their pedagogy; few seem worried about diluting their brand-name appeal. The risks are greater for lesser colleges, which may be tempted to drop some of their own introductory courses — and some professors who teach them — and substitute cheaper online instruction from big-name professors.

“We’ve reached the tipping point where every major university is thinking about what they will do online,” said Peter McPherson, the president of the Association of Public and Land-Grant Universities. “In a way, the most important thing about these MOOCs from the top universities is that they provide cover, so other universities don’t need to apologize about putting courses online.”

In the rush to keep up, elite universities are lining up to join forces with a MOOC provider. Coursera, which began with Princeton, the University of Pennsylvania, Stanford and the University of Michigan in April, currently leads the field with 33 university partners. But edX, too, is expanding rapidly — the University of California, Berkeley, has joined, and the University of Texas announced that it would use edX courses for credit. Already, students in one Udacity class can get credit through the Global Campus of Colorado State University. Most MOOC providers are making plans to offer credit — and charge fees for certificates and proctored exams.

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Responding to Illnesses Manifesting Amid Recovery From Storm

Nicole Bengiveno/The New York Times

Dr. Aaron Gardener, center, attended to a patient at an ad hoc medical unit in Long Beach, N.Y. Many people have coughs, rashes and other ailments.

Day and night, victims of Hurricane Sandy have been streaming into ad hoc emergency rooms and relief centers, like the MASH-type medical unit on an athletic field in Long Beach, and the warming tent in the Rockaways the size of a small high school gym.

They complain of rashes, asthma and coughing. They need tetanus shots because — house-proud and armed with survivalist instincts — they have been ripping out waterlogged boards and getting poked by rusty nails. Those with back pain from sifting through debris receive muscle relaxants; those with chest pain from overexertion are hooked up to cardiac monitors.

“I’ve been coughing,” said Gabriel McAuley, 46, who has been working 16-hour days gutting homes and hauling debris in the Rockaways since the storm hit. “I’ve never felt a cough like that before. It’s deeper down.”

It is impossible to say how many people have been sickened by what Hurricane Sandy left behind: mold from damp drywall; spills from oil tanks; sewage from floodwater and unflushable toilets; tons upon tons of debris and dust. But interviews with hurricane victims, recovery workers, health officials and medical experts over the last week reveal that some of the illnesses that they feared would occur, based on the toxic substances unleashed by the storm and the experience of other disasters, notably Hurricane Katrina, have begun to manifest themselves.

Emergency rooms and poison control centers have reported cases of carbon monoxide exposure — and in New Jersey, several deaths have been attributed to it — from the misuse of generators to provide power and stoves to provide heat.

In Livingston, N.J., the Burn Center at St. Barnabas Medical Center had 16 burn cases over about six days, three times as many as usual, from people trying to dispel the cold and darkness with boiling water, gasoline, candles and lighter fluid.

Raw sewage spilled into homes in Baldwin and East Rockaway, in Nassau County, when a sewage plant shut down because of the surge and the system could not handle the backup. Sewage also spilled from a huge plant in Newark. “We tried to limit our presence in the house because the stink was horrible,” said Jennifer Ayres, 34, of Baldwin, who has been staying temporarily in West Hempstead. She said that she felt ill for several days, that her son had a scratchy throat, and that her mother, who lives in the house, had difficulty breathing, all problems she attributed to the two days they spent inside their house cleaning up last week. “I had stomach problems. I felt itchy beyond itchy on my face.”

Coughing — locally known as the Rockaway cough — is a common symptom that health officials said could come from mold, or from the haze of dust and sand kicked up by the storm and demolitions. The air in the Rockaways is so full of particles that the traffic police wear masks — though many recovery workers do not, worrying people who recall the fallout of another disaster.

“It’s just like 9/11,” said Kathy Smilardi, sitting inside the skeleton of her gutted home in Broad Channel, wrapped in a white puffy jacket, her breath visible in the afternoon cold. “Everyone runs in to clean up, and they’re not wearing masks. Are we going to wait 20 years to figure out that people are dying?”

Health officials and experts say the risks are real, but are cautioning against hysteria. Some coughing could be due to cold, damp weather. Lasting health effects from mold, dust and other environmental hazards generally require long-term, continuous exposure, they said. And the short-term effects can be mitigated by taking precautions like wearing masks, gloves and boots and removing mold-infested wallboard. “The reality is that cleaning up both muck and sewage and spills and removing walls and reconstruction and dealing with debris all do in fact pose concerns,” Daniel Kass, New York City’s deputy commissioner for environmental health, said Friday. “Are they vast or uncontrollable? No. But they depend on people doing work correctly and taking basic precautions.”

The Katrina cough was found to be temporary, said Roy J. Rando, a professor at Tulane’s School of Public Health and Tropical Medicine. Felicia Rabito, an epidemiologist at the school, said that healthy children exposed to mold after Hurricane Katrina showed no lasting respiratory symptoms when they moved back to new or renovated homes.

Immediately after Hurricane Katrina, lead levels in New Orleans’s soil dropped after the top layers of dirt, where lead from paint and gasoline can accumulate, were washed away. But in the two years afterward, soil testing found extremely high lead levels, Dr. Rabito said, which she theorized came from renovating old homes. “That’s a cautionary tale,” she said. Lead in soil can be tracked into homes and pose a health hazard to children playing inside or outside.

Though at least one outbreak of norovirus, a contagious gastrointestinal virus, occurred in a Brooklyn high school that was used as a shelter, New York and New Jersey health officials said they had not seen any significant spike in respiratory or gastrointestinal diseases related to the storm.

In Broad Channel, most homes on Noel Road, where Ms. Smilardi lives, have outdoor oil tanks that were overturned by the storm. The innards of many homes, built when asbestos was used, lie spilled among major and minor roads.

Ominous red spots covered both sides of Paul Nowinski’s burly torso. After the storm, Mr. Nowinski, a musician, waded into the basement of his childhood home on Beach 146th Street in the Rockaways to try to salvage records, books and instruments. He was up to his chest in water, which he thinks might have been contaminated with sewage. He said that he did not know the cause of the red marks; and that he had been too busy “schlepping” to go to the doctor.

Angela Macropoulos contributed reporting.

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Responding to Illnesses Manifesting Amid Recovery From Storm

Nicole Bengiveno/The New York Times

Dr. Aaron Gardener, center, attended to a patient at an ad hoc medical unit in Long Beach, N.Y. Many people have coughs, rashes and other ailments.

Day and night, victims of Hurricane Sandy have been streaming into ad hoc emergency rooms and relief centers, like the MASH-type medical unit on an athletic field in Long Beach, and the warming tent in the Rockaways the size of a small high school gym.

They complain of rashes, asthma and coughing. They need tetanus shots because — house-proud and armed with survivalist instincts — they have been ripping out waterlogged boards and getting poked by rusty nails. Those with back pain from sifting through debris receive muscle relaxants; those with chest pain from overexertion are hooked up to cardiac monitors.

“I’ve been coughing,” said Gabriel McAuley, 46, who has been working 16-hour days gutting homes and hauling debris in the Rockaways since the storm hit. “I’ve never felt a cough like that before. It’s deeper down.”

It is impossible to say how many people have been sickened by what Hurricane Sandy left behind: mold from damp drywall; spills from oil tanks; sewage from floodwater and unflushable toilets; tons upon tons of debris and dust. But interviews with hurricane victims, recovery workers, health officials and medical experts over the last week reveal that some of the illnesses that they feared would occur, based on the toxic substances unleashed by the storm and the experience of other disasters, notably Hurricane Katrina, have begun to manifest themselves.

Emergency rooms and poison control centers have reported cases of carbon monoxide exposure — and in New Jersey, several deaths have been attributed to it — from the misuse of generators to provide power and stoves to provide heat.

In Livingston, N.J., the Burn Center at St. Barnabas Medical Center had 16 burn cases over about six days, three times as many as usual, from people trying to dispel the cold and darkness with boiling water, gasoline, candles and lighter fluid.

Raw sewage spilled into homes in Baldwin and East Rockaway, in Nassau County, when a sewage plant shut down because of the surge and the system could not handle the backup. Sewage also spilled from a huge plant in Newark. “We tried to limit our presence in the house because the stink was horrible,” said Jennifer Ayres, 34, of Baldwin, who has been staying temporarily in West Hempstead. She said that she felt ill for several days, that her son had a scratchy throat, and that her mother, who lives in the house, had difficulty breathing, all problems she attributed to the two days they spent inside their house cleaning up last week. “I had stomach problems. I felt itchy beyond itchy on my face.”

Coughing — locally known as the Rockaway cough — is a common symptom that health officials said could come from mold, or from the haze of dust and sand kicked up by the storm and demolitions. The air in the Rockaways is so full of particles that the traffic police wear masks — though many recovery workers do not, worrying people who recall the fallout of another disaster.

“It’s just like 9/11,” said Kathy Smilardi, sitting inside the skeleton of her gutted home in Broad Channel, wrapped in a white puffy jacket, her breath visible in the afternoon cold. “Everyone runs in to clean up, and they’re not wearing masks. Are we going to wait 20 years to figure out that people are dying?”

Health officials and experts say the risks are real, but are cautioning against hysteria. Some coughing could be due to cold, damp weather. Lasting health effects from mold, dust and other environmental hazards generally require long-term, continuous exposure, they said. And the short-term effects can be mitigated by taking precautions like wearing masks, gloves and boots and removing mold-infested wallboard. “The reality is that cleaning up both muck and sewage and spills and removing walls and reconstruction and dealing with debris all do in fact pose concerns,” Daniel Kass, New York City’s deputy commissioner for environmental health, said Friday. “Are they vast or uncontrollable? No. But they depend on people doing work correctly and taking basic precautions.”

The Katrina cough was found to be temporary, said Roy J. Rando, a professor at Tulane’s School of Public Health and Tropical Medicine. Felicia Rabito, an epidemiologist at the school, said that healthy children exposed to mold after Hurricane Katrina showed no lasting respiratory symptoms when they moved back to new or renovated homes.

Immediately after Hurricane Katrina, lead levels in New Orleans’s soil dropped after the top layers of dirt, where lead from paint and gasoline can accumulate, were washed away. But in the two years afterward, soil testing found extremely high lead levels, Dr. Rabito said, which she theorized came from renovating old homes. “That’s a cautionary tale,” she said. Lead in soil can be tracked into homes and pose a health hazard to children playing inside or outside.

Though at least one outbreak of norovirus, a contagious gastrointestinal virus, occurred in a Brooklyn high school that was used as a shelter, New York and New Jersey health officials said they had not seen any significant spike in respiratory or gastrointestinal diseases related to the storm.

In Broad Channel, most homes on Noel Road, where Ms. Smilardi lives, have outdoor oil tanks that were overturned by the storm. The innards of many homes, built when asbestos was used, lie spilled among major and minor roads.

Ominous red spots covered both sides of Paul Nowinski’s burly torso. After the storm, Mr. Nowinski, a musician, waded into the basement of his childhood home on Beach 146th Street in the Rockaways to try to salvage records, books and instruments. He was up to his chest in water, which he thinks might have been contaminated with sewage. He said that he did not know the cause of the red marks; and that he had been too busy “schlepping” to go to the doctor.

Angela Macropoulos contributed reporting.

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Gaza Clash Escalates With Deadliest Israeli Strike

Bernat Armangue/Associated Press

Smoke rose over Gaza City on Sunday, as Israel widened its range of targets to include buildings used by the news media.

CAIRO — Emboldened by the rising power of Islamists around the region, the Palestinian militant group Hamas demanded new Israeli concessions to its security and autonomy before it halts its rocket attacks on Israel, even as the conflict took an increasing toll on Sunday.

After five days of punishing Israeli airstrikes on the Hamas-controlled Gaza Strip and no letup in the rocket fire in return, representatives of Israel and Hamas met separately with Egyptian officials in Cairo on Sunday for indirect talks about a truce.

The talks came as an Israeli bomb struck a house in Gaza on Sunday afternoon, killing 11 people, in the deadliest single strike since the conflict between Israel and Hamas escalated on Wednesday. The strike, along with several others that killed civilians across the Gaza Strip, signaled that Israel was broadening its range of targets on the fifth day of the campaign.

By the end of the day, Gaza health officials reported that 70 Palestinians had been killed in airstrikes since Wednesday, including 20 children, and that 600 had been wounded. Three Israelis have been killed and at least 79 wounded by unrelenting rocket fire out of Gaza into southern Israel and as far north as Tel Aviv.

Hamas, badly outgunned on the battlefield, appeared to be trying to exploit its increased political clout with its ideological allies in Egypt’s new Islamist-led government. The group’s leaders, rejecting Israel’s call for an immediate end to the rocket attacks, have instead laid down sweeping demands that would put Hamas in a stronger position than when the conflict began: an end to Israel’s five-year-old embargo of the Gaza Strip, a pledge by Israel not to attack again and multinational guarantees that Israel would abide by its commitments.

Prime Minister Benjamin Netanyahu of Israel stuck to his demand that all rocket fire cease before the air campaign lets up, and Israeli tanks and troops remained lined up outside Gaza on Sunday. Tens of thousands of reserve troops had been called up. “The army is prepared to significantly expand the operation,” Mr. Netanyahu said at the start of a cabinet meeting.

Reda Fahmy, a member of Egypt’s upper house of Parliament and of the nation’s dominant Islamist party, who is following the talks, said Hamas’s position was just as unequivocal. “Hamas has one clear and specific demand: for the siege to be completely lifted from Gaza,” he said. “It’s not reasonable that every now and then Israel decides to level Gaza to the ground, and then we decide to sit down and talk about it after it is done. On the Israeli part, they want to stop the missiles from one side. How is that?”

He added: “If they stop the aircraft from shooting, Hamas will then stop its missiles. But violence couldn’t be stopped from one side.”

Hamas’s aggressive stance in the cease-fire talks is the first test of the group’s belief that the Arab Spring and the rise in Islamist influence around the region have strengthened its political hand, both against Israel and against Hamas’s Palestinian rivals, who now control the West Bank with Western backing.

It also puts intense new pressure on President Mohamed Morsi of Egypt, a former leader of the Muslim Brotherhood who was known for his fiery speeches defending Hamas and denouncing Israel. Mr. Morsi must now balance the conflicting demands of an Egyptian public that is deeply sympathetic to Hamas and the Palestinian cause against Western pleadings to help broker a peace and Egypt’s need for regional stability to help revive its moribund economy.

Indeed, the Egyptian-led cease-fire talks illustrate the diverging paths of the Muslim Brotherhood and Hamas, a Palestinian offshoot of the original Egyptian Islamist group. Hamas has evolved into a more militant insurgency and is labeled a terrorist organization by the United States and Israel, while the Brotherhood has effectively become Egypt’s ruling party. Mr. Fahmy said in an interview in March that the Brotherhood’s new responsibilities required a step back from its ideological cousins in Hamas, and even a new push to persuade the group to compromise.

Reporting was contributed by Ethan Bronner, Irit Pazner Garshowitz and Isabel Kershner from Jerusalem, and Peter Baker from Bangkok.

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You for Sale: Your Online Attention, Bought in an Instant by Advertisers

Monica Almeida/The New York Times

Frank Addante, 36, chief executive of the Rubicon Project, says that 97 percent of American Internet users encounter its electronic ad sales system every month. And most aren’t even aware of it.

YOU can be sold in seconds.

Beverly Orr

“Online consumers are being bought and sold like chattel,” says Jeffrey Chester, executive director of the Center for Digital Democracy.

No, wait: make that milliseconds.

The odds are that access to you — or at least the online you — is being bought and sold in less than the blink of an eye. On the Web, powerful algorithms are sizing you up, based on myriad data points: what you Google, the sites you visit, the ads you click. Then, in real time, the chance to show you an ad is auctioned to the highest bidder.

Not that you’d know it. These days in the hyperkinetic world of digital advertising, all of this happens automatically, and imperceptibly, to most consumers.

Ever wonder why that same ad for a car or a couch keeps popping up on your screen? Nearly always, the answer is real-time bidding, an electronic trading system that sells ad space on the Web pages people visit at the very moment they are visiting them. Think of these systems as a sort of Nasdaq stock market, only trading in audiences for online ads. Millions of bids flood in every second. And those bids — essentially what your eyeballs are worth to advertisers — could determine whether you see an ad for, say, a new Lexus or a used Ford, for sneakers or a popcorn maker.

One big player in this space is the Rubicon Project. Never heard of it? Consider this: Rubicon, based in Los Angeles, has actually eclipsed Google in one crucial area — the percentage of Internet users in the United States reached by display ads sold through its platform, according to comScore, a digital analytics company.

Rubicon is among a handful of technology companies that have quietly developed automated ad sales systems for Web site operators. The bidders are marketers seeking to identify their best prospects and pitch them before they move to the next Web page. It is a form of high-frequency trading — that souped-up business of algorithm-loving Wall Streeters. But in this case, the prize is the attention of ordinary people. And it all depends on data-mining to instantly evaluate the audiences available to see those online display ads, the ones that appear on Web sites next to or around content.

In industry parlance, each digital ad space is an impression. The value of an impression depends on several factors, like the size of the ad, the type of person who is available to see it and that person’s location.

“The first impression seen by a high-value person on the opening page of a major newspaper first thing in the morning has a different value than a user from China who is 12 and has been on the Web all day long playing games,” says Frank Addante, the founder and chief executive of Rubicon.

Yet for most of us, real-time bidding is invisible. About 97 percent of American Internet users interact with Rubicon’s system every month, Mr. Addante says, and most of them aren’t aware of it.

That worries some federal regulators and consumer advocates, who say that such electronic trading systems could unfairly stratify consumers, covertly offering better pricing to certain people while relegating others to inferior treatment. A computer-generated class system is one risk, they say, of an ad-driven Internet powered by surveillance.

“As you profile more and more people, you’ll start to segregate people into ‘the people you can get money out of’ and ‘the people you can’t get money out of,’ ” says Dan Auerbach, a staff technologist at the Electronic Frontier Foundation, a digital civil rights group in San Francisco, who formerly worked in digital ad data-mining. “That is one of the dangers we should be worried about.”

Of course, ad agencies and brands can tailor ads to Web users without real-time bidding. They can also buy ads without aiming them at narrow audience groups. But for marketers, the marriage of ad- and audience-buying is one of the benefits of real-time bidding.

Not so long ago, they simply bought ad spaces based on a site’s general demographics and then showed every visitor the same ad, a practice called “spray and pray.” Now marketers can aim just at their ideal customers — like football fans who earn more than $100,000 a year, or mothers in Denver in the market for an S.U.V. — showing them tailored ads at the exact moment they are available on a specific Web page.

“We are not buying content as a proxy for audience,” says Paul Alfieri, the vice president for marketing at Turn, a data management company and automated buy-side platform for marketers based in Redwood City, Calif. “We are just buying who the audience is.”

Still, for many consumer advocates, real-time bidding resembles nothing so much as a cattle auction.

“Online consumers are being bought and sold like chattel,” says Jeffrey Chester, the executive director of the Center for Digital Democracy, a consumer group in Washington that has filed a complaint about real-time bidding with the Federal Trade Commission. “It’s dehumanizing.”

FRANK ADDANTE is 36 years old and given to wearing black shirts with a white Rubicon logo on the front. Rubicon is the fifth company he has started or helped to found.

In 1996, in his dorm room at the Illinois Institute of Technology, he developed and introduced a search engine. He later helped found L90, a digital ad technology company that went public and was later acquired by DoubleClick. His fourth enterprise, StrongMail Systems, provides e-mail delivery infrastructure to large companies.

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