Well: Meatless Main Dishes for a Holiday Table

Most vegetarian diners are happy to fill their plates with delicious sides and salads, but if you want to make them feel special, consider one of these main course vegetarian dishes from Martha Rose Shulman. All of them are inspired by Greek cooking, which has a rich tradition of vegetarian meals.

I know that Greek food is not exactly what comes to mind when you hear the word “Thanksgiving,” yet why not consider this cuisine if you’re searching for a meatless main dish that will please a crowd? It’s certainly a better idea, in my mind, than Tofurky and all of the other overprocessed attempts at making a vegan turkey. If you want to serve something that will be somewhat reminiscent of a turkey, make the stuffed acorn squashes in this week’s selection, and once they’re out of the oven, stick some feathers in the “rump,” as I did for the first vegetarian Thanksgiving I ever cooked: I stuffed and baked a huge crookneck squash, then decorated it with turkey feathers. The filling wasn’t nearly as good as the one you’ll get this week, but the creation was fun.

Here are five new vegetarian recipes for your Thanksgiving table — or any time.

Giant Beans With Spinach, Tomatoes and Feta: This delicious, dill-infused dish is inspired by a northern Greek recipe from Diane Kochilas’s wonderful new cookbook, “The Country Cooking of Greece.”

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Northern Greek Mushroom and Onion Pie: Meaty portobello mushrooms make this a very substantial dish.

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Roasted Eggplant and Chickpeas With Cinnamon-Tinged Tomato Sauce and Feta: This fragrant and comforting dish can easily be modified for vegans.

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Coiled Greek Winter Squash Pie: The extra time this beautiful vegetable pie takes to assemble is worth it for a holiday dinner.

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Baked Acorn Squash Stuffed With Wild Rice and Kale Risotto: Serve one squash to each person at your Thanksgiving meal: They’ll be like miniature vegetarian (or vegan) turkeys.

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Shortcuts: The Meaning in a Drawer Full of Old Family Snapshots

Eric Thayer/Reuters

A resident found photos as she sifted the debris of a house destroyed by Hurricane Sandy in Union Beach, N.J.

I WASN’T going to write about Hurricane Sandy. I was going to write about the changing nature of photographs and our relationship to them in this digital age.

Doug Mills/The New York Times

Picture-taking is now mainly digital, making prints of photos uncommon.

But as I began my research, I came across a Facebook page where lost photos from the storm were posted. Called “Union Beach — Photos and Misplaced Items,” the page shows photos of newborns and birthday parties, weddings and family gatherings.

Starting the morning after the storm devastated her community of Union Beach, N.J., Jeanette Van Houten and her niece have collected over a thousand photos and some photo albums. She is making it her mission to scan and post to Facebook as many as possible, including those turned into the fire department, police station and borough hall.

In addition, she was handed a drawerful of over a thousand family photos that must have been wrenched from a dresser.

About 60 photos have been claimed so far, and some professionals have offered to restore damaged photos free.

“These photos were passed down through families and they survived Sandy, even if the structures they were in didn’t,” Ms. Van Houten said. “They tell our story.”

With the Facebook page, Ms. Van Houten uses newer technology to help people reconnect with their old-fashioned snapshots. And seeing the photographs of mundane scenes and milestones on Facebook, along with the grateful comments from people who got back a bit of their lives, reminded me of both the fragility and strength of photos and their continuing importance in our lives. Judith Dupré, author of “Monuments: America’s History in Art and Memory” (Random House, 2007), and other books, teaches a class at her local library in Mamaroneck, N.Y., called “Stories from My Life,” for older residents. They use photos and stories to write about their lives.

“They bring in a basketful of photos,” Ms. Dupré said. “Each one of these photos contains a story — they’re like a key that opens the door to a life.”

And a printed photo “is a different species than a digital photo,” she said. “I don’t think anyone’s figured out the place of digital photos in terms of memory keeping.”

When an elderly aunt of hers died and left behind lots of photographs, Ms. Dupré said the family took them to the memorial service.

“We had a table and people could select and take what they wanted,” she said. “It was a very moving part of the memorial.”

Of course, even prints can lose their meaning and poignancy through the generations.

And in some cases, as with Hurricane Sandy, photos may be safer in cyberspace than in an album on a bookshelf — as long as you remember to upload them to a site like Flickr, Shutterfly, Snapfish or countless other photo sites available. (And make sure you know how long a site will keep your photos. Some, for example, require you to show some activity at least once a year.) That way, if you lose your hard drive, you don’t lose your photos.

But Ms. Dupré said she worried that photos that existed only online somewhere might die with the photographer.

“I don’t even know what my parents have in terms of digital photography,” she said. She said she put the password to her photos safely away with her will and other documents, so her children can access them.

Now I’m not trying to say that the old-fashioned way is the only way. Photography has constantly evolved. The Brownie camera, first sold by Kodak for $1 in 1900, radicalized photography by making it available to just about everyone.

But, and I know this largely a generational thing, I can’t help but wonder about the ubiquity of the cellphone photo. As Ms. Dupré said, “The infinite number of digital photos that can be taken has devalued the single image and made one-of-a-kind prints that much more precious.”

E-mail: shortcuts@nytimes.com

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Israel Sticks to Tough Approach in Conflict With Hamas

TEL AVIV — With rockets landing on the outskirts of Tel Aviv and Jerusalem on Friday and the Egyptian prime minister making a solidarity visit to Gaza, the accelerating conflict between Israel and Hamas — reminiscent in many ways of so many previous battles — has the makings of a new kind of Israeli-Palestinian face-off.

The combination of longer-range and far deadlier rockets in the hands of more radicalized Palestinians, the arrival in Gaza and Sinai from North Africa of other militants pressuring Hamas to fight more, and the growing tide of anti-Israel fury in a region where authoritarian rulers have been replaced by Islamists means that Israel is engaging in this conflict with a different set of challenges.

The Middle East of 2012 is not what it was in late 2008, the last time Israel mounted a military invasion to reduce the rocket threat from Gaza. Many analysts and diplomats outside Israel say the country today needs a different approach to Hamas and the Palestinians based more on acknowledging historic grievances and shifting alliances.

“As long as the crime of dispossession and refugeehood that was committed against the Palestinian people in 1947-48 is not redressed through a peaceful and just negotiation that satisfies the legitimate rights of both sides, we will continue to see enhancements in both the determination and the capabilities of Palestinian fighters — as has been the case since the 1930s, in fact,” Rami G. Khouri, a professor at the American University of Beirut, wrote in an online column. “Only stupid or ideologically maniacal Zionists fail to come to terms with this fact.”

But the government in Israel and the vast majority of its people have drawn a very different conclusion. Their dangerous neighborhood is growing still more dangerous, they agree. That means not concessions, but being tougher in pursuit of deterrence, and abandoning illusions that a Jewish state will ever be broadly accepted here.

“There is a theory, which I believe, that Hamas doesn’t want a peaceful solution and only wants to keep the conflict going forever until somehow in their dream they will have all of Israel,” Eitan Ben Eliyahu, a former leader of the Israeli Air Force, said in a telephone briefing. “There is a good chance we will go into Gaza on the ground again.”

What is striking in listening to the Israelis discuss their predicament is how similar the debate sounds to so many previous ones, despite the changed geopolitical circumstances. In most minds here, the changes do not demand a new strategy, simply a redoubled old one.

The operative metaphor is often described as “cutting the grass,” meaning a task that must be performed regularly and has no end. There is no solution to security challenges, officials here say, only delays and deterrence. That is why the idea of one day attacking Iranian nuclear facilities, even though such an attack would set the nuclear program back only two years, is widely discussed as a reasonable option. That is why frequent raids in the West Bank and surveillance flights over Lebanon never stop.

And that is why this week’s operation in Gaza is widely viewed as having been inevitable, another painful but necessary maintenance operation that, officials here say, will doubtless not be the last.

There are also those who believe that the regional upheavals are improving Israel’s ability to carry out deterrence. One retired general who remains close to the military and who spoke on the condition of anonymity said that with Syria torn apart by civil war, Hezbollah in Lebanon discredited because of its support for the Syrian government, and Egypt so weakened economically, Israel should not worry about anything but protecting its civilians.

“Should we let our civilians be bombed because the Arab world is in trouble?” he asked.

So much was happening elsewhere in the region — the Egyptian and Libyan revolutions, the Syrian civil war, dramatic changes in Yemen and elections in Tunisia — that a few rockets a day that sent tens of thousands of Israeli civilians into bomb shelters drew little attention. But in the Israeli view, the necessity of a Gaza operation has been growing steadily throughout the Arab Spring turmoil.

In 2009, after the Israeli invasion pushed Hamas back and killed about 1,400 people in Gaza, 200 rockets hit Israel. The same was true in 2010. But last year the number rose to 600, and before this week the number this year was 700, according to the Israeli military. The problem went beyond rockets to mines planted near the border aimed at Israeli military jeeps and the digging of explosive-filled tunnels.

“In 2008 we managed to minimize rocket fire from Gaza significantly,” said Lt. Col. Avital Leibovich, a military spokeswoman. “We started that year with 100 rockets a week and ended it with two a week. We were able to give people in our south two to three years. But the grass has grown, and other things have as well. Different jihadist ideologies have found their way into Gaza, including quite a few terrorist organizations. More weapons have come in, including the Fajr-5, which is Iranian made and can hit Tel Aviv. That puts nearly our entire population in range. So we reached a point where we cannot act with restraint any longer.”

Gazans see events in a very different light. The problem, they say, comes from Israel: Israeli drones fill the Gazan skies, Israeli gunboats strafe their waters, Palestinian militants are shot at from the air, and the Gaza border areas are declared off limits by Israel with the risk of death from Israeli gunfire.

But there is little dissent in Israel about the Gaza policy. This week leaders of the leftist opposition praised the assassination of Ahmed al-Jabari, the Hamas military commander, on Wednesday. He is viewed here as the equivalent of Osama bin Laden. The operation could go on for many days before there is any real dissent.

The question here, nonetheless, is whether the changed regional circumstances will make it harder to “cut the grass” in Gaza this time and get out. A former top official who was actively involved in the last Gaza war and who spoke on the condition of anonymity said it looked to him as if Hamas would not back down as easily this time.

“They will not stop until enough Israelis are killed or injured to create a sense of equality or balance,” he said. “If a rocket falls in the middle of Tel Aviv, that will be a major success. But this government will go back at them hard. I don’t see this ending in the next day or two.”

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Automated Bidding Systems Test Old Ways of Selling Ads

Publishers and broadcasters have long tried to offer advertisers the right audience for their products. Want to sell pick-ups to people who like sports? Buy ads at halftime during a football game. Selling luggage or airline tickets? Buy ads in the travel section of a newspaper or Web site.

In digital advertising, that formula is being increasingly tested by fast-paced, algorithmic bidding systems that target individual consumers rather than the aggregate audience publishers serve up. In the world of “programmatic buying” technologies, context matters less than tracking those consumers wherever they go. And that kind of buying is the reason that shoe ad follows you whether you’re on Weather.com or on a local news blog.

That shift is punishing traditional online publishers, like newspaper, broadcast and magazine sites, who are receiving a much lower percentage of ad dollars as marketers use programmatic buying across a much broader canvas. Some sites, like CNN.com, refuse to even accept advertising through programmatic buying because they do not want to cede control over what ads will appear.

“It’s allowing advertisers to assign value to media rather than publishers,” said Ben Winkler, the chief digital officer at OMD, an agency in the Omnicom Media Group. Publishers, he said, “can’t control the price, but they can control the quality of the content and the audience on that site.”

About 10 percent of the display ads that consumers see online have been sold through programmatic bidding channels, according to Walter Knapp, the executive vice president of platform revenue and operations at Federated Media, one of the world’s largest digital advertising networks.

Advertisers like Nike, Comcast, Progressive and Procter & Gamble are now using the programmatic buying, and luxury advertisers are starting to follow. According to data from Forrester Research, all ads traded on exchanges, as programmatic ads are, increased more than 17.5 percent to about 629 billion impressions (the number of times an ad appears) in 2012, from 535 billion in 2011.

That growth is affecting publishers of all stripes, but few are willing to discuss their internal numbers. “For a publisher to admit they’ve been hurt is tough for the big guys,” said John Ebbert, the executive editor and publisher of the Web site AdExchanger.

When The New York Times Company announced its earnings last month, the company posted a profit, but said that digital advertising fell 2.2 percent. Jim Follo, the company’s senior vice president and chief financial officer, attributed the dip, in part, on a “shift toward ad exchanges, real-time bidding and other programmatic buying channels that allow advertisers to buy audience at scale.”

Programmatic buying began as a way for advertisers to place lower-cost ads for products like teeth-whitening products and belly fat pills that filled up the back pages of Web sites. But the practice has gained in sophistication and breadth, with major advertisers and many of the world’s largest ad agencies creating private exchanges to automate the buying and selling of ads.

Programmatic buying includes a number of different technologies and strategies, but it essentially allows advertisers to bid, often in real time, on ad space largely based on the value they have assigned to the consumer on the other side of the screen. Say, for example, that Nike wants to sell running gear to a particular consumer who has a high likelihood of buying shoes based on the data it has collected, including the type of Web sites that consumer typically visits. Because the ad-buying is done through computer trading, the price for that space can change rapidly.

“Accessing media is a commodity now,” said Sheldon Gilbert, the founder and chief executive of Proclivity Media, a company that specializes in digital advertising technologies. “Instead of having to commit four months in advance, you can now bid and buy an individual impression in real time.”

In the short run, the growth in programmatic buying has forced overall ad prices to fall. A media buyer who would have once spent $50,000 worth of advertising on a publisher’s site, at, say, an $8 cost-per-thousand, can now buy ad impressions on any Web site on which they happen to find their intended audience and pay less per ad, Mr. Ebbert said.

“There is no scarcity of premium online,” said Dan Salmon, an equity research analyst at BMO Capital Markets. “There’s only one Super Bowl, but there are lots of different places to buy banner ads online.”

While the “halo effect” of buying an ad against premium content has not disappeared entirely — many advertisers still want front-page placement on popular Web sites — the shift is prompting publishers to rethink how they sell their ads.

Clark Fredricksen, the vice president for communications at eMarketer, a data company, said that publishers were “going to have to double down to prove the value of their inventory as they compete with other, cheaper inventory.”

And some publishers are jumping into the game themselves. During the most recent AOL earnings call, Tim Armstrong, the company’s chairman and chief executive, said it was bullish on programmatic buying, despite being a publisher itself with properties that include TechCrunch and The Huffington Post. The company trades its ads through its own ad network, Ad.com, and others like it.

“We will continue to invest in people and technology to capture the programmatic business of advertising,” Mr. Armstrong said.

Like AOL, Weather.com is also aggressively moving into programmatic bidding. “Instead of thinking of us a publisher, think of us as a marketing engine,” said Curt Hecht, the chief global revenue officer for the Weather Company.

Neal Mohan, the vice president for product management at Google, which sells advertising though its DoubleClick network, says that in the long run, publishers could see higher returns from programmatic advertising. In the last year, the number of advertisers and publishers using the DoubleClick platform has doubled, Mr. Mohan said, while the rates for those using the platform have increased 11 percent. But that means publishers will have to play by different rules.

“Context still matters and so does placement,” Mr. Ebbert said. “But it’s only one element.”

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For Alzheimer’s, Detection Advances Outpace Treatment Options

Joshua Lott for The New York Times

Awilda Jimenez got a scan for Alzheimer’s after she started forgetting things. It was positive.

When Awilda Jimenez started forgetting things last year, her husband, Edwin, felt a shiver of dread. Her mother had developed Alzheimer’s in her 50s. Could his wife, 61, have it, too?

He learned there was a new brain scan to diagnose the disease and nervously agreed to get her one, secretly hoping it would lay his fears to rest. In June, his wife became what her doctor says is the first private patient in Arizona to have the test.

“The scan was floridly positive,” said her doctor, Adam S. Fleisher, director of brain imaging at the Banner Alzheimer’s Institute in Phoenix.

The Jimenezes have struggled ever since to deal with this devastating news. They are confronting a problem of the new era of Alzheimer’s research: The ability to detect the disease has leapt far ahead of treatments. There are none that can stop or even significantly slow the inexorable progression to dementia and death.

Families like the Jimenezes, with no good options, can only ask: Should they live their lives differently, get their affairs in order, join a clinical trial of an experimental drug?

“I was hoping the scan would be negative,” Mr. Jimenez said. “When I found out it was positive, my heart sank.”

The new brain scan technology, which went on the market in June, is spreading fast. There are already more than 300 hospitals and imaging centers, located in most major metropolitan areas, that are ready to perform the scans, according to Eli Lilly, which sells the tracer used to mark plaque for the scan.

The scans show plaques in the brain — barnaclelike clumps of protein, beta amyloid — that, together with dementia, are the defining feature of Alzheimer’s disease. Those who have dementia but do not have excessive plaques do not have Alzheimer’s. It is no longer necessary to wait until the person dies and has an autopsy to learn if the brain was studded with plaques.

Many insurers, including Medicare, will not yet pay for the new scans, which cost several thousand dollars. And getting one comes with serious risks. While federal law prevents insurers and employers from discriminating based on genetic tests, it does not apply to scans. People with brain plaques can be denied long-term care insurance.

The Food and Drug Administration, worried about interpretations of the scans, has required something new: Doctors must take a test showing they can read them accurately before they begin doing them. So far, 700 doctors have qualified, according to Eli Lilly. Other kinds of diagnostic scans have no such requirement.

In another unusual feature, the F.D.A. requires that radiologists not be told anything about the patient. They are generally trained to incorporate clinical information into their interpretation of other types of scans, said Dr. R. Dwaine Rieves, director of the drug agency’s Division of Medical Imaging Products.

But in this case, clinical information may lead radiologists to inadvertently shade their reports to coincide with what doctors suspect is the underlying disease. With Alzheimer’s, Dr. Rieves said, “clinical impressions have been misleading.”

“This is a big change in the world of image interpretation,” he said.

Like some other Alzheimer’s experts, Dr. Fleisher used the amyloid scan for several years as part of a research study that led to its F.D.A. approval. Subjects were not told what the scans showed. Now, with the scan on the market, the rules have changed.

Dr. Fleisher’s first patient was Mrs. Jimenez. Her husband, the family breadwinner, had lost his job as a computer consultant when the couple moved from New York to Arizona to take care of Mrs. Jimenez’s mother. Paying several thousand dollars for a scan was out of the question. But Dr. Fleisher found a radiologist, Dr. Mantej Singh Sra of Sun Radiology, who was so eager to get into the business that he agreed to do Mrs. Jimenez’s scan free. His plan was to be the first in Arizona to do a scan, and advertise it.

After Dr. Sra did the scan, the Jimenezes returned to Dr. Fleisher to learn the result.

Dr. Fleisher, sad to see so much plaque in Mrs. Jimenez’s brain, referred her to a psychiatrist to help with anxiety and suggested she enter clinical trials of experimental drugs.

But Mr. Jimenez did not like that idea. He worried about unexpected side effects.

“Tempting as it is, where do you draw the line?” he asks. “At what point do you take a risk with a loved one?”

At Mount Sinai Medical Center in New York, Dr. Samuel E. Gandy found that his patients — mostly affluent — were unfazed by the medical center’s $3,750 price for the scan. He has been ordering at least one a week for people with symptoms ambiguous enough to suggest the possibility of brain plaques.

Most of his patients want their names kept confidential, fearing an inability to get long-term care insurance, or just wanting privacy.

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For Alzheimer’s, Detection Advances Outpace Treatment Options

Joshua Lott for The New York Times

Awilda Jimenez got a scan for Alzheimer’s after she started forgetting things. It was positive.

When Awilda Jimenez started forgetting things last year, her husband, Edwin, felt a shiver of dread. Her mother had developed Alzheimer’s in her 50s. Could his wife, 61, have it, too?

He learned there was a new brain scan to diagnose the disease and nervously agreed to get her one, secretly hoping it would lay his fears to rest. In June, his wife became what her doctor says is the first private patient in Arizona to have the test.

“The scan was floridly positive,” said her doctor, Adam S. Fleisher, director of brain imaging at the Banner Alzheimer’s Institute in Phoenix.

The Jimenezes have struggled ever since to deal with this devastating news. They are confronting a problem of the new era of Alzheimer’s research: The ability to detect the disease has leapt far ahead of treatments. There are none that can stop or even significantly slow the inexorable progression to dementia and death.

Families like the Jimenezes, with no good options, can only ask: Should they live their lives differently, get their affairs in order, join a clinical trial of an experimental drug?

“I was hoping the scan would be negative,” Mr. Jimenez said. “When I found out it was positive, my heart sank.”

The new brain scan technology, which went on the market in June, is spreading fast. There are already more than 300 hospitals and imaging centers, located in most major metropolitan areas, that are ready to perform the scans, according to Eli Lilly, which sells the tracer used to mark plaque for the scan.

The scans show plaques in the brain — barnaclelike clumps of protein, beta amyloid — that, together with dementia, are the defining feature of Alzheimer’s disease. Those who have dementia but do not have excessive plaques do not have Alzheimer’s. It is no longer necessary to wait until the person dies and has an autopsy to learn if the brain was studded with plaques.

Many insurers, including Medicare, will not yet pay for the new scans, which cost several thousand dollars. And getting one comes with serious risks. While federal law prevents insurers and employers from discriminating based on genetic tests, it does not apply to scans. People with brain plaques can be denied long-term care insurance.

The Food and Drug Administration, worried about interpretations of the scans, has required something new: Doctors must take a test showing they can read them accurately before they begin doing them. So far, 700 doctors have qualified, according to Eli Lilly. Other kinds of diagnostic scans have no such requirement.

In another unusual feature, the F.D.A. requires that radiologists not be told anything about the patient. They are generally trained to incorporate clinical information into their interpretation of other types of scans, said Dr. R. Dwaine Rieves, director of the drug agency’s Division of Medical Imaging Products.

But in this case, clinical information may lead radiologists to inadvertently shade their reports to coincide with what doctors suspect is the underlying disease. With Alzheimer’s, Dr. Rieves said, “clinical impressions have been misleading.”

“This is a big change in the world of image interpretation,” he said.

Like some other Alzheimer’s experts, Dr. Fleisher used the amyloid scan for several years as part of a research study that led to its F.D.A. approval. Subjects were not told what the scans showed. Now, with the scan on the market, the rules have changed.

Dr. Fleisher’s first patient was Mrs. Jimenez. Her husband, the family breadwinner, had lost his job as a computer consultant when the couple moved from New York to Arizona to take care of Mrs. Jimenez’s mother. Paying several thousand dollars for a scan was out of the question. But Dr. Fleisher found a radiologist, Dr. Mantej Singh Sra of Sun Radiology, who was so eager to get into the business that he agreed to do Mrs. Jimenez’s scan free. His plan was to be the first in Arizona to do a scan, and advertise it.

After Dr. Sra did the scan, the Jimenezes returned to Dr. Fleisher to learn the result.

Dr. Fleisher, sad to see so much plaque in Mrs. Jimenez’s brain, referred her to a psychiatrist to help with anxiety and suggested she enter clinical trials of experimental drugs.

But Mr. Jimenez did not like that idea. He worried about unexpected side effects.

“Tempting as it is, where do you draw the line?” he asks. “At what point do you take a risk with a loved one?”

At Mount Sinai Medical Center in New York, Dr. Samuel E. Gandy found that his patients — mostly affluent — were unfazed by the medical center’s $3,750 price for the scan. He has been ordering at least one a week for people with symptoms ambiguous enough to suggest the possibility of brain plaques.

Most of his patients want their names kept confidential, fearing an inability to get long-term care insurance, or just wanting privacy.

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Gadgetwise Blog: The Lytro Camera Adds a New Perspective

The Lytro camera made a splash with its ability to refocus photos after they were taken. Now the company is adding a new trick — allowing the camera to shift your viewing angle slightly on your finished photo.

The new feature, called “Perspective Shift,” is a software upgrade that will be released to the public Dec. 4. It will be included with new cameras, and will be a free upgrade for older cameras.

Lytro is able to add Perspective Shift because it doesn’t work like a traditional camera. Instead of capturing light as data, the way digital cameras do, it captures data about the light. It reads the direction of the light, so it knows what light rays are traveling toward your subject and what light rays are bouncing off your subject for you to see.

Using that information, it constructs a image. But it can use that data to construct that image in many different ways, which is how it manages to change focus. It can use the data about the light to construct the photo as it would be if you were focused on the foreground, or  to construct the same photo as if you were focused on the background.

This also gives it the new capability to shift perspective. From the data about the light, it can construct the photo as if you were standing a little bit to one side or the other.

When you use the software that lets you interact with your photos, you can roll your cursor around the picture and see the view shift as you do.

While it’s an interesting novelty, the immediate value isn’t apparent – the perspective shift is fairly subtle. But it may have much greater value down the road, because the shift is enough to build 3-D images from a single photo. It’s a capability that the Lytro says is on the way.

The company has also added “Living Filters,” which are photo effects like those you’re used to seeing on phone camera apps like Instagram. The difference here is you can move the filters around and apply them selectively.

You can see a demonstration of both Perspective Shift and Living Filters on the Lytro Web site gallery.

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Israel Prepares Possible Ground Offensive in Gaza

Rina Castelnuovo for The New York Times

Israeli soldiers near the border with Gaza on Friday. More Photos »

JERUSALEM — After a morning of heavy rocket fire from Gaza into Israel, the Israeli military seemed to be edging closer to a ground invasion of Gaza on Friday, saying forces were “on standby” and “ready to enter should it be decided that a ground operation is necessary.”

In a statement, the Israeli military said paratrooper and infantry brigades had completed final preparations for a potential ground operation, which would be the first since the winter of 2008-09, when Israel drew broad international reproach for an invasion that claimed 1,400 Palestinian lives for the loss of 13 Israelis.

The statement came after scores of rockets were fired into Israel, striking major cities of the south, causing widespread panic and damage and shattering plans for a temporary cease-fire during a remarkable visit to Gaza by the Egyptian prime minister that showed the shifting dynamics of Middle East politics since the turmoil of the Arab Spring uprisings.

Word of the potential invasion emerged shortly before a rocket from Gaza struck near Tel Aviv. It was the second attempt to strike at the city in two days. Hamas said it had fired a single “homemade” projectile toward Tel Aviv.

An Israeli police spokesman, Micky Rosenfeld, said the rocket that was fired at Tel Aviv probably landed in the sea, and that it was one of about 120 rockets fired into Israel by dusk on Friday. Israeli officials say that the only rockets in Gaza with a range that can reach Tel Aviv are the Iranian-made Fajr-5 projectiles that Israel has been targeting in its hundreds of airstrikes over the last two days.

That these rockets were still being fired seemed to weigh heavily in Israeli military calculations about a ground invasion. After a meeting with President Shimon Peres, Prime Minister Benjamin Netanyahu said the Israeli army was “continuing to hit Hamas hard and is ready to expand the operation into Gaza,” according to a statement from his office.

Mr. Netanyahu said the aim was “to take out the terrorist infrastructure in Gaza while doing everything possible not to harm civilians.”

The rapidly escalating confrontation between Hamas and Israel followed an Israeli airstrike on Wednesday that killed the top commander of Hamas, and the tit-for-tat violence is widely seen as a potential catalyst for broader hostilities at a time of spreading turmoil in Syria and elsewhere in the region.

The Israeli military said Col. Amir Baram, commander of the Israel Defense Forces’ paratroopers brigade, had addressed his forces during a preparatory briefing in the field, saying: “We are already 48 hours into an operation that we knew would have to happen. We have spoken about it during training, exercises and conferences. There is no doubt that we have to operate. This is why we enlisted, and why we have trained.”

Witnesses on the Gaza-Israel border said Israeli tanks had massed in several places.

Early on Friday, the Israeli military said it had called up 16,000 army reservists after Defense Minister Ehud Barak authorized the call-up of 30,000 reservists, if needed, to move against what Israel considers an unacceptable security threat from smuggled rockets amassed by Hamas, which does not recognize Israel’s right to exist.

It was not initially clear whether the show of Israeli force on the ground was meant as more of an intimidation tactic to further pressure Hamas leaders, who had all been forced into hiding on Wednesday after the group’s military chief, Ahmed al-Jabari, was killed in a pinpoint aerial bombing. But Israel’s preparations seemed to pick up on Friday after the attempts to land rockets in Tel Aviv added new urgency while Hamas itself seemed emboldened by Egypt’s support.

“The time in which the Israeli occupation does whatever it wants in Gaza is gone,” said Ismail Haniya, the Hamas prime minister.

Initially, the Egyptian initiative was portrayed as a potential harbinger of reduced hostilities, and, as Prime Minister Hesham Qandil of Egypt prepared to travel to Gaza, Israel agreed to a temporary conditional cease-fire for the visit. But the truce never took root.

Israel Radio said Palestinian militants had fired 25 rockets into southern Israel, one of them striking a house. There were no immediate reports of casualties.

What sounded like airstrikes by Israeli F-16s were also audible in Gaza City. The Israeli military said no such strikes had taken place, but the Hamas Health Ministry reported that two people, including a child, were killed in the north of Gaza City while the Egyptian delegation was on the ground.

The Palestinian death toll rose to 23 on Friday. The number included a man apparently executed by Hamas for what it said was collaboration with Israel in the deaths of 15 Palestinian leaders. Three Israelis were killed Thursday in a rocket attack in Kiryat Malachi, a small town in southern Israel, when a rocket fired from Gaza struck their apartment building.

Isabel Kershner reported from Jerusalem, Jodi Rudoren from Gaza City, and Alan Cowell from Paris. Reporting was contributed by Fares Akram from Gaza, Rick Gladstone from New York, Rina Castelnuovo from the Gaza-Israel border, Mayy El Sheikh and David D. Kirkpatrick from Cairo, and Gabby Sobelman from Jerusalem.

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Greece Looks at Offering Creditors a Buyback to Lower Its Debt

LONDON — As Greece’s creditors bicker over the terms of its bailout, the government is examining a more radical approach that could reduce the country’s escalating debt pile in one fell swoop.

Milos Bicanski/Getty Images

An anti-austerity protest on Wednesday in Athens. The government this month narrowly secured parliamentary approval for yet another round of spending cuts and tax increases.

Fotis Plegas G./European Pressphoto Agency

Charles Dallara of the Institute of International Finance argues that the real issue is Greece’s inability to revive its economy.

Essentially, Greece would propose that its private sector bondholders sell back their sovereign debt holdings for a small profit, but at a price favorable to Greece. The move takes a page from the playbook Greece used earlier this year in which the government pressured banks and other private holders to take a loss on their sovereign bonds so Greece could ease its debt load. This time, they would not be forced to take a haircut, but some would most likely balk at being forced to accept a new deal.

The aim is to further reduce an ever-increasing sovereign debt burden that is fast approaching 200 percent of gross domestic product, far beyond Europe’s ideal of 60 percent or less.

Many different strategies about how to address Greece’s debt load are being discussed by its creditors, with the buyback option being just one of several. The government this month narrowly secured parliamentary approval for yet another round of spending cuts and tax increases, putting Greece on the verge of receiving 31 billion euros, or $39 billion, in desperately needed bailout loans. The euro zone is also weighing measures — like extending loan maturities and paring interest rates — that would further ease the country’s financial burden.

While the most pressing need is securing the 31 billion euros Greece needs to survive, arriving at a long-term solution for its bloated sovereign debt is also seen as crucial, given that the economy continues to shrink. An estimate released Wednesday showed Greece’s economy contracted by 7 percent in the third quarter — which makes the debt relative to economic output all the more onerous.

 To that end, a small circle of lawyers and bankers are suggesting that Greece offer to buy back its deeply discounted debt at a price of 27 to 33 euro cents, compared to the 25-cent level where it currently trades. If investors hold out for a higher price, the government could invoke collective action clauses (C.A.C.’s) in the bond contracts that, in theory, would prevent a bidding war, thus allowing the country to retire as much as 40 billion euros of its 340 billion euros in debt.

For example, the 62 billion euros’ worth of new bonds that Greece issued as part of its landmark debt restructuring deal reached with private bondholders in March are now valued at about 15 billion euros, or $19 billion. If Greece were to borrow the money to buy back this debt, it could retire 30 billion to 40 billion euros’ worth of its obligations, depending on the ultimate price it pays.

While borrowing such an amount would be a challenge, Germany — the biggest euro zone economy and thus the biggest contributor to the Greek bailout — could take the view that this would be a better way to reduce Greek debt than to ask taxpayers to swallow a loss via a write-down of public sector bailout loans.

Unlike the last time around, when the protracted wrangling between the Greek government and private bondholders centered on banks, hedge funds and other investors’ accepting a reduction in the bonds’ value, they will not have to suffer a large loss on their bond holdings. Depending on the price, however, they may have to forgo some further upside if the bonds continue to rally after the buyback.

If successful, the debt buyback could significantly reduce Greece’s debt and afford the country a realistic chance of meeting the target of a debt ratio of 120 percent of G.D.P. by 2020 that the International Monetary Fund has set as a condition for it to lend more money. European leaders have said that this benchmark is too stringent and needs to be relaxed.

Of course, the idea has infuriated the many hedge funds that in past months have scooped up more than 22 billion euros’ worth of Greek bonds at rock-bottom prices. With many sitting on big profits after the recent market rally, they are in no mood to sell out cheaply, especially if Greece resorts to wielding a legal cudgel to complete the deal.

“It’s really the dumbest thing that Greece can do right now,” said Hans Humes of Greylock Capital, who has been one of the more aggressive investors in terms of accumulating discounted Greek bonds.

Collective action clauses are legal riders in bond contracts that can make it easier for a debtor country to restructure its loans by forcing holdouts to accept the country’s proposal for a bond swap if a certain majority of creditors agree to it. They were used to great effect during the 100 billion euro restructuring of Greece’s private sector debt earlier this year.

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Hospital Death in Ireland Renews Fight Over Abortion

DUBLIN — The death of a woman who was reportedly denied a potentially lifesaving abortion even while she was having a miscarriage has revived debate over Ireland’s almost total ban on abortions.

The woman, Savita Halappanavar, 31, a dentist who lived near Galway, was 17 weeks pregnant when she sought treatment at University Hospital Galway on Oct. 21, complaining of severe back pain.

Dr. Halappanavar was informed by senior hospital physicians that she was having a miscarriage and that her fetus had no chance of survival. However, despite repeated pleas for an abortion, she was told that it would be illegal while the fetus’s heart was still beating, her husband, Praveen Halappanavar, said.

It was not until Oct. 24 that the heartbeat ceased and the remains of the fetus were surgically removed. But Dr. Halappanavar contracted a bacterial blood disease, septicemia. She was admitted to intensive care but never recovered, dying on Oct. 28.

Mr. Halappanavar, in an interview with The Irish Times from his home in India, said his wife was told after one request, “This is a Catholic country.”

Two investigations into the case have been announced, and politicians have been quick to express their condolences and to call for legal clarity. Kathleen Lynch, a junior health minister, said medical professionals needed guidelines to deal with such circumstances.

In a statement, the hospital said it would cooperate fully with any inquest but that it had not started its own review because it wanted to consult the woman’s family first.

Mr. Halappanavar told the newspaper that he still could not believe his wife was dead. “I was with her those four days in intensive care,” he said. “They kept telling me: ‘She’s young. She’ll get over it.’ But things never changed; they only got worse. She was so full of life. She loved kids.

“It was all in their hands, and they just let her go. How can you let a young woman go to save a baby who will die anyway?”

But Mr. Halappanavar said he saw no use in being angry. “I’ve lost her,” he said. “I am talking about this because it shouldn’t happen to anyone else.”

Medical professionals were less forgiving. During a miscarriage, the cervix is opened, exposing the woman to infection, and the longer the miscarriage persists, the greater the risk, said a prominent medical commentator here, Dr. Muiris Houston. While Dr. Halappanavar’s death was “on the rare end of the spectrum,” and the facts surrounding the case are not all known, Dr. Houston said, she “undoubtedly needed to go to theater,” meaning to surgery.

“If she had gone to theater earlier she might still have died, but perhaps not,” he said. “Medicine is now increasingly driven by guidelines, and the question must be, ‘Did the hospital have protocols in place when a woman presented with such a condition?’ ”

The legal issues are, if anything, more clouded. In 1992, the Irish Supreme Court ruled that abortion was permissible in cases where there was a “real and substantial risk” to the life of a pregnant woman — including the possibility of suicide. But 20 years later, the Irish government has still not passed a law to this effect.

In 2010, the European Court of Human Rights found that Ireland was in violation of the European Convention on Human Rights by failing to provide an accessible and effective procedure to ascertain whether a woman qualified for a legal abortion.

In response, the current coalition government commissioned a report from an expert group on the issue. It was initially expected in July, but was then postponed until September — a deadline also missed. Given the divisiveness of the abortion issue in Ireland, which has prompted two bitterly fought referendums, successive governments have avoided passing any legislation.

The report was eventually delivered Tuesday night, hours before news broke of Dr. Halappanavar’s death. The government warned people not to link the two, but inevitably the death has led to calls for urgent reform.

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