Well: Turning to the Web for a Medical Diagnosis

Thirty-five percent of American adults said they have used the Internet to diagnose a medical condition for themselves or someone else, according to a new Pew Research Center study. Women are more likely than men to turn to the Internet for diagnoses. Other groups more likely to do so are younger people, white adults, people with college degrees and those who live in households with income above $75,000.

The study, released by Pew’s Internet and American Life Project on Tuesday, points out that Americans have always tried to answer their health questions at home, but that the Internet has expanded the options for research. Previous surveys have asked questions about online diagnoses, but the Pew study was the first to focus on the topic with a nationally representative sample, said Susannah Fox, an associate director at Pew Internet. Surveyors interviewed 3,014 American adults by telephone, from August to September 2012.

Of the one in three Americans who used the Internet for a diagnosis, about a third said they did not go to a doctor to get a professional medical opinion, while 41 percent said a doctor confirmed their diagnosis. Eighteen percent said a doctor did not agree with their diagnosis. As far as where people start when researching health conditions online, 77 percent said they started at a search engine like Google, Bing or Yahoo, while 13 percent said they began at a site that specializes in health information.

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Well: Turning to the Web for a Medical Diagnosis

Thirty-five percent of American adults said they have used the Internet to diagnose a medical condition for themselves or someone else, according to a new Pew Research Center study. Women are more likely than men to turn to the Internet for diagnoses. Other groups more likely to do so are younger people, white adults, people with college degrees and those who live in households with income above $75,000.

The study, released by Pew’s Internet and American Life Project on Tuesday, points out that Americans have always tried to answer their health questions at home, but that the Internet has expanded the options for research. Previous surveys have asked questions about online diagnoses, but the Pew study was the first to focus on the topic with a nationally representative sample, said Susannah Fox, an associate director at Pew Internet. Surveyors interviewed 3,014 American adults by telephone, from August to September 2012.

Of the one in three Americans who used the Internet for a diagnosis, about a third said they did not go to a doctor to get a professional medical opinion, while 41 percent said a doctor confirmed their diagnosis. Eighteen percent said a doctor did not agree with their diagnosis. As far as where people start when researching health conditions online, 77 percent said they started at a search engine like Google, Bing or Yahoo, while 13 percent said they began at a site that specializes in health information.

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Leon Panetta Says U.S. Has Pledged to Help France in Mali

LISBON — In a move that could draw the United States into another conflict in North Africa, the Obama administration has pledged to help the French in their fight against Islamist militants in Mali, Defense Secretary Leon E. Panetta said Monday. He said the assistance could include air and other logistical support.

Jacquelyn Martin/Associated Press

Defense Secretary Leon E. Panetta boards a plane bound for Portugal on Monday.

The United States was already sharing intelligence with the French when their warplanes struck camps, depots and other militant positions deep inside Islamist-held territory in northern Mali on Sunday. Defense officials said that no decisions had been made about whether the United States would also offer help with midflight refueling planes and air transport, but that those options were under review.

Defense officials would not rule out the possibility that American military transport planes might land in Mali, where the United States has been conducting an ambitious counterterrorism program for years. The officials would not discuss whether the United States has deployed drone aircraft, either armed or unarmed, over Mali.

Mr. Panetta, who spoke to reporters on his plane en route to Portugal for a weeklong trip in Europe, said that the chaos in Mali was of deep concern to the administration, and he praised the French for their actions. He also said “what we have promised them is that we would work with them, to cooperate with them, to provide whatever assistance we can to try to help them in that effort.”

Mr. Panetta said that the Obama administration was deeply worried about the two extremist groups that hold large swaths of territory in northern Mali, Ansar Dine and Al Qaeda in the Islamic Maghreb, or AQIM. “We’re concerned that any time Al Qaeda establishes a base of operations, while they might not have any immediate plans for attacks in the United States and in Europe, that ultimately that still remains their objective,” he said.

For that reason, he said, “we have to take steps now to make sure that AQIM does not get that kind of traction.”

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Drivers With Hands Full Get a Backup: The Car

Annie Tritt for The New York Times

Jesse Levinson of Stanford develops safety and self-driving systems like one on this Volkswagen Passat that detects obstacles.

PALO ALTO, Calif. — Driving around a college campus can be treacherous. Bikes and scooters zip out of nowhere, distracted students wander into traffic, and stopped cars and speed bumps suddenly appear. It takes a vigilant driver to avoid catastrophe.

Jesse Levinson does not much worry about this when he drives his prototype Volkswagen Passet around the Stanford University campus here. A computer vision system he helped design keeps an unblinking eye out for pedestrians and cyclists, and automatically slows and stops the car when they enter his path.

Someday soon, few drivers will have to worry about car crashes and collisions, whether on congested roads or on empty highways, technology companies and car manufacturers are betting. But even now, drivers are benefiting from a suite of safety systems, and many more are in development to transform driving from a manual task to something more akin to that of a conductor overseeing an orchestra.

An array of optical and radar sensors now monitor the surroundings of a growing number of cars traveling the nation’s highways, and in some cases even track the driver’s physical state. Pedestrian detection systems, like the one that Dr. Levinson, a research scientist at Stanford’s Center for Automotive Research, has helped design, are already available in luxury cars and are being built into some midrange models.

The systems offer auditory, visual and mechanical warnings if a collision is imminent — and increasingly, if needed, take evasive actions automatically. By the middle of this decade, under certain conditions, they will take over the task of driving completely at both high and low speeds.

But the new systems are poised to refashion the nature of driving fundamentally long before completely autonomous vehicles arrive.

“This is really a bridge,” said Ragunathan Rajkumar, a computer science professor who is leading a Carnegie Mellon University automated driving research project partly financed by General Motors. “The driver is still in control. But if the driver is not doing the right thing, the technology takes over.”

By Carnegie Mellon University

Carnegie Mellon's Autonomous Cadillac SRX can drive itself on public roads, detect and stop for pedestrians, and communicate with traffic signals--among other things--all while looking very normal.

Although drivers — at least for now — remain responsible for their vehicles, a host of related legal and insurance issues have already arisen, and researchers are opening a new line of study about how humans interact with the automatic systems.

What the changes will mean to the century-old American romance with the car remains to be seen. But the safety systems, the result of rapid advances in computer algorithms and the drastically falling cost of sensors, are a practical reaction to the modern reality of drivers who would rather talk on the phone and send text messages than concentrate on the road ahead and drive.

Four manufacturers — Volvo, BMW, Audi and Mercedes — have announced that as soon as this year they will begin offering models that will come with sensors and software to allow the car to drive itself in heavy traffic at speeds up to 37 miles per hour. The systems, known as Traffic Jam Assist, will follow the car ahead and automatically slow down and speed up as needed, handling both braking and steering.

At faster speeds, Cadillac’s Super Cruise system is intended to automate freeway driving by keeping the car within a lane and adjusting speed to other traffic. The company has not said when it will add the system to its cars.

Already actions like steering, braking and accelerating are increasingly handled by computer software rather than the driver.

“People don’t realize that when you step on antilock brakes it’s simply a suggestion for the car to stop,” said Clifford Nass, a director at the Center for Automotive Research at Stanford. How and when the car stops is left to the system.

The automobile industry has been motivated to innovate by growing evidence that existing technologies like the antilocking braking systems and electronic stability control have saved tens of thousands of lives.

In November, the National Transportation Safety Board recommended that all new cars be equipped with collision avoidance technologies, including adaptive cruise control and automatic braking. Two states — California and Nevada — have passed laws making it legal to operate self-driving cars as long as a human being is inside, able to take over.

The National Highway Traffic Safety Administration recently reported that one system, electronic stability control, or E.S.C., which digitally detects the loss of traction and compensates automatically, saved 2,202 lives from 2008 to 2010. Federal safety regulations began phasing in electronic stability control on small trucks and passenger vehicles in 2007.

This article has been revised to reflect the following correction:

Correction: January 12, 2013

An earlier version of this article misstated the federal agency that recommended that all new cars be equipped with collision avoidance technologies. It was the National Transportation Safety Board, not the National Highway Traffic Safety Administration.

This article has been revised to reflect the following correction:

Correction: January 14, 2013

An earlier version of this article, and a photo caption, misidentified the model of car that researchers at Stanford are working with. It is a Volkswagen Passat, not a Touareg. The article also referred incorrectly to one of the researchers on second reference. Jesse Levinson has a PhD, and should have been referred to as Dr. Levinson, not Mr. Levinson.

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Wheels Blog: The Seventh-Generation Corvette Is Unveiled in Detroit

DETROIT — The Stingray is back, in name and in spirit.

At an invitation-only gathering hours before the North American International Auto Show was scheduled to open for press previews, General Motors introduced the 2014 Corvette, the seventh generation of Chevrolet’s hallmark sports car.

Underscoring the importance of this vehicle was Chevrolet’s revival of the long-dormant Stingray badge, a name it first used on a 1959 racecar built by G.M.’s design chief, Bill Mitchell. The hope for that original Stingray racecar was to beat Europe’s best, and G.M. still seems to be thinking along those lines.

According to G.M.’s president for North America, Mark Reuss, the latest Stingray is a potential worldbeater.

“Like the ’63 Sting Ray, the best Corvettes embodied performance leadership, delivering cutting-edge technologies, breathtaking design and awe-inspiring driving experiences,” Mr. Reuss said. “The all-new Corvette goes farther than ever, thanks to today’s advancements in design technology and engineering.”

The release of a new Corvette is always highly anticipated by auto enthusiasts; speculation about “C7″ — shorthand for the seventh generation — has run high. Would it get a twin-cam turbocharged powertrain? Would Chevy switch to an exotic midengine chassis?

In actuality, the 2014 model will again have a pushrod V-8 engine in its nose, driving the rear wheels. That conservative approach might be seen as a timid compromise from a company that has just begun to get back on solid financial footing. But the front-engine, rear-drive layout has long defined the Corvette, and this car, like its C6 predecessor, may well show its taillights to cars with specs that more closely conform to what is considered state of the art.

While automakers are quick to toss around the words “all new” to describe their latest offerings, however warmed over they might be, in this case the term is justified — the 2014 Corvette shares only two parts with its predecessor.

The C7 Corvette’s styling is in keeping with the brand’s persona, yet it projects a more aggressive image than previous generations. The clean front fascia is devoid of parking lights, and is energized by a sharp edge where it meets the hood, which is itself defined by a prominent bulge and more hard edges. The curve of the front fenders peaks at yet another edge that blends seamlessly into the body side at the A-pillar. The body’s flanks are defined by character lines that race back from vents behind the front wheel, not unlike those of previous Corvettes, but here those lines are more sharply drawn, with the upper line sweeping up and back to define the shape of the rear quarter panel. The lower character line projects from the body, forming a wing of sorts that flows out of the front fender and terminates at the rear of the door. The coupe’s roofline arcs smoothly to meet the rear spoiler, rather than terminating at the rear window, as in the C6. The individual rear taillights that have long been a part of Corvette design are now paired in a deep recess on each side. Four large exhaust pipes exit center-stage, rear.

The sheet-molded fiberglass body, with carbon-fiber hood and roof panels and carbon-nano composite underbody panels, is 37 pounds lighter than the C6’s body. It rides on a new aluminum frame that is 57 percent stiffer and 99 pounds lighter than the current model’s. The wheelbase is about one inch longer than that of the C6, and the track is almost an inch wider — changes said to provide a more stable feel at high speed.

Inside the cockpit, considerable effort was lavished on upgrading what has generally been considered a blighted zone. Optional carbon fiber trim and real aluminum combine with plastic in a wraparound configuration. The steering wheel, with a 14.1 inch diameter, is smaller than that of the previous model, and two seat choices are offered, with the competition sport version providing more side bolstering to hold occupants in place in spirited maneuvers. Indicative of the car’s purpose is the inclusion of a console-mounted steel grab bar for the passenger.

Under the hood, Chevrolet’s 6.2-liter small block V-8 — now in its fifth-generation design — produces an estimated 450 horsepower and 450 pound-feet of torque. At low speed, torque output exceeds that of the previous 6.2-liter engine by 50 pound-feet. The engine shares few parts with prior Corvette V-8s and is fitted with direct fuel injection that, in combination with other refinements, enables a high compression ratio of 11.5:1. Active Fuel Management, G.M.’s system for deactivating cylinders when they are not needed, lets the car cruise on four cylinders in some driving modes. Final fuel-economy numbers are not yet available.

Two transaxles will be offered: a 6-speed automatic with paddle-shift mode or a 7-speed manual with rev-matching capability — an electronic version of the heel-and-toe shifting techniques that competition drivers employ to enable smooth gear changes when negotiating twisty bits.

The Corvette driver will be able to select from among five driving modes: weather, Eco, Tour, Sport and Track; the default setting will be Tour. Changing modes alters 12 vehicle attributes, including throttle response, shift points, engagement of the limited-slip differential engagement, shock damping and more. Four-piston Brembo brakes provide stopping power, and electric power steering sets the course.

An optional Z51 performance package adds an electronic limited-slip differential that can continuously vary torque split between the rear wheels, dry-sump oiling, upgraded shock absorbers, a revised version of the automaker’s Magnetic Ride Control suspension-regulating system, close-ratio gears for the manual transmission, larger brake rotors and aerodynamic refinements that incorporate air-flow management for cooling of heat-stressed components.

Like its predecessor, the 2014 Corvette Stingray will be built at a G.M. plant in Bowling Green, Ky. The car is expected to arrive at dealerships in the third quarter of this year.

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Susan Nolen-Hoeksema, Psychologist Who Studied Depression in Women, Dies at 53

Susan Nolen-Hoeksema, a psychologist and writer whose work helped explain why women are twice as prone to depression as men and why such low moods can be so hard to shake, died on Jan. 2 in New Haven. She was 53.

Andrew Sacks

Susan Nolen-Hoeksema at the University of Michigan in 2003. Dr. Nolen-Hoeksema's research showed that women were more prone to ruminate, or dwell on the sources of problems rather than solutions, more than men.

Her death followed heart surgery to correct a congenitally weak valve, said her husband, Richard Nolen-Hoeksema.

Dr. Nolen-Hoeksema, a professor at Yale University, began studying depression in the 1980s, a time of great excitement in psychiatry and psychology. New drugs like Prozac were entering the market; novel talking therapies were proving effective, too, particularly cognitive behavior therapy, in which people learn to defuse upsetting thoughts by questioning their basis.

Her studies, first in children and later in adults, exposed one of the most deceptively upsetting of these patterns: rumination, the natural instinct to dwell on the sources of problems rather than their possible solutions. Women were more prone to ruminate than men, the studies found, and in a landmark 1987 paper she argued that this difference accounted for the two-to-one ratio of depressed women to depressed men.

She later linked rumination to a variety of mood and behavior problems, including anxiety, eating disorders and substance abuse.

“The way I think she’d put it is that, when bad things happen, women brood — they’re cerebral, which can feed into the depression,” said Martin Seligman, a professor of psychology at the University of Pennsylvania, who oversaw her doctoral work. “Men are more inclined to act, to do something, plan, beat someone up, play basketball.”

Dr. Seligman added, “She was the leading figure in sex differences in depression of her generation.”

Dr. Nolen-Hoeksema wrote several books about her research for general readers, including “Women Who Think Too Much: How to Break Free of Overthinking and Reclaim Your Life.” These books described why rumination could be so corrosive — it is deeply distracting; it tends to highlight negative memories — and how such thoughts could be alleviated.

Susan Kay Nolen was born on May 22, 1959, in Springfield, Ill., to John and Catherine Nolen. Her father ran a construction business, where her mother was the office manager; Susan was the eldest of three children.

She entered Illinois State University before transferring to Yale. She graduated summa cum laude in 1982 with a degree in psychology.

After earning a Ph.D. in psychology at the University of Pennsylvania, she joined the faculty at Stanford. She later moved to the University of Michigan, before returning to Yale in 2004.

Along the way she published scores of studies and a popular textbook. In 2003 she became the editor of the Annual Review of Clinical Psychology, an influential journal.

Dr. Nolen-Hoeksema moved smoothly between academic work and articles and books for the general reader.

“I think part of what allowed her to move so easily between those two worlds was that she was an extremely clear thinker, and an extremely clear writer,” said Marcia K. Johnson, a psychology professor and colleague at Yale.

Dr. Nolen-Hoeksema lived in Bethany, Conn. In addition to her husband, a science writer, she is survived by a son, Michael; her brothers, Jeff and Steve; and her father, John.

“Over the past four decades women have experienced unprecedented growth in independence and opportunities,” Dr. Nolen-Hoeksema wrote in 2003, adding, “We have many reasons to be happy and confident.”

“Yet when there is any pause in our daily activities,” she continued, “many of us are flooded with worries, thoughts and emotions that swirl out of control, sucking our emotions and energy down, down, down. We are suffering from an epidemic of overthinking.”

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Susan Nolen-Hoeksema, Psychologist Who Studied Depression in Women, Dies at 53

Susan Nolen-Hoeksema, a psychologist and writer whose work helped explain why women are twice as prone to depression as men and why such low moods can be so hard to shake, died on Jan. 2 in New Haven. She was 53.

Andrew Sacks

Susan Nolen-Hoeksema at the University of Michigan in 2003. Dr. Nolen-Hoeksema's research showed that women were more prone to ruminate, or dwell on the sources of problems rather than solutions, more than men.

Her death followed heart surgery to correct a congenitally weak valve, said her husband, Richard Nolen-Hoeksema.

Dr. Nolen-Hoeksema, a professor at Yale University, began studying depression in the 1980s, a time of great excitement in psychiatry and psychology. New drugs like Prozac were entering the market; novel talking therapies were proving effective, too, particularly cognitive behavior therapy, in which people learn to defuse upsetting thoughts by questioning their basis.

Her studies, first in children and later in adults, exposed one of the most deceptively upsetting of these patterns: rumination, the natural instinct to dwell on the sources of problems rather than their possible solutions. Women were more prone to ruminate than men, the studies found, and in a landmark 1987 paper she argued that this difference accounted for the two-to-one ratio of depressed women to depressed men.

She later linked rumination to a variety of mood and behavior problems, including anxiety, eating disorders and substance abuse.

“The way I think she’d put it is that, when bad things happen, women brood — they’re cerebral, which can feed into the depression,” said Martin Seligman, a professor of psychology at the University of Pennsylvania, who oversaw her doctoral work. “Men are more inclined to act, to do something, plan, beat someone up, play basketball.”

Dr. Seligman added, “She was the leading figure in sex differences in depression of her generation.”

Dr. Nolen-Hoeksema wrote several books about her research for general readers, including “Women Who Think Too Much: How to Break Free of Overthinking and Reclaim Your Life.” These books described why rumination could be so corrosive — it is deeply distracting; it tends to highlight negative memories — and how such thoughts could be alleviated.

Susan Kay Nolen was born on May 22, 1959, in Springfield, Ill., to John and Catherine Nolen. Her father ran a construction business, where her mother was the office manager; Susan was the eldest of three children.

She entered Illinois State University before transferring to Yale. She graduated summa cum laude in 1982 with a degree in psychology.

After earning a Ph.D. in psychology at the University of Pennsylvania, she joined the faculty at Stanford. She later moved to the University of Michigan, before returning to Yale in 2004.

Along the way she published scores of studies and a popular textbook. In 2003 she became the editor of the Annual Review of Clinical Psychology, an influential journal.

Dr. Nolen-Hoeksema moved smoothly between academic work and articles and books for the general reader.

“I think part of what allowed her to move so easily between those two worlds was that she was an extremely clear thinker, and an extremely clear writer,” said Marcia K. Johnson, a psychology professor and colleague at Yale.

Dr. Nolen-Hoeksema lived in Bethany, Conn. In addition to her husband, a science writer, she is survived by a son, Michael; her brothers, Jeff and Steve; and her father, John.

“Over the past four decades women have experienced unprecedented growth in independence and opportunities,” Dr. Nolen-Hoeksema wrote in 2003, adding, “We have many reasons to be happy and confident.”

“Yet when there is any pause in our daily activities,” she continued, “many of us are flooded with worries, thoughts and emotions that swirl out of control, sucking our emotions and energy down, down, down. We are suffering from an epidemic of overthinking.”

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India Ink: Woman Raped by Seven Men in Punjab, India, Police Say

NEW DELHI — Police said Sunday that a  29-year-old woman had been raped by a bus driver, a bus conductor and five other men in the north Indian state of Punjab, in an incident that recalls the recent attack in Delhi that has caused widespread outrage.

The woman boarded a bus on Friday bound for Gurdaspur, to visit her in-laws, the police chief of Gurdaspur, Raj Jit Singh, said in a telephone interview. When she got off the bus, the driver offered her a ride on his motorcycle, perhaps to her in-laws village, the police said. Instead, he took her to a nearby village where he and six other men, including the bus conductor, raped her repeatedly through the night.

The next morning, the driver dropped her at her in-laws home, where the woman told her family members of the incident, and then reported it to the police, Mr. Singh said.

Six men, including the bus driver and conductor, have been arrested, he said. All of the men are their twenties.

Gurmesh Singh, the deputy superintendent of police for the  region, said it was unclear how or why the bus driver persuaded the woman to go with him on his motorcycle. She was in a state of distress during the bus ride, Mr. Singh said, and originally refused to get off of the bus when it reached its final destination.

The Press Trust of India reported that the bus driver did not stop at her stop when requested.

The gang-rape of a woman on a moving bus in New Delhi on Dec. 16, and her subsequent death from injuries sustained during the rape, has sparked widespread protests and calls for increased policing and tougher laws against sexual assault in India.

The case against five of the men arrested in that rape is being heard this month in a special fast-track court created just for incidents of sexual assault.

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Aaron Swartz, Internet Activist, Dies at 26

Aaron Swartz, a wizardly programmer who as a teenager helped develop code that delivered ever-changing Web content to users and who later became a steadfast crusader to make that information freely available, was found dead on Friday in his New York apartment.

An uncle, Michael Wolf, said that Mr. Swartz, 26, had apparently hanged himself, and that a friend of Mr. Swartz’s had discovered the body.

At 14, Mr. Swartz helped create RSS, the nearly ubiquitous tool that allows users to subscribe to online information. He later became an Internet folk hero, pushing to make many Web files free and open to the public. But in July 2011, he was indicted on federal charges of gaining illegal access to JSTOR, a subscription-only service for distributing scientific and literary journals, and downloading 4.8 million articles and documents, nearly the entire library.

Charges in the case, including wire fraud and computer fraud, were pending at the time of Mr. Swartz’s death, carrying potential penalties of up to 35 years in prison and $1 million in fines.

“Aaron built surprising new things that changed the flow of information around the world,” said Susan Crawford, a professor at the Cardozo School of Law in New York who served in the Obama administration as a technology adviser. She called Mr. Swartz “a complicated prodigy” and said “graybeards approached him with awe.”

Mr. Wolf said he would remember his nephew, who had written in the past about battling depression and suicidal thoughts, as a young man who “looked at the world, and had a certain logic in his brain, and the world didn’t necessarily fit in with that logic, and that was sometimes difficult.”

The Tech, a newspaper of the Massachusetts Institute of Technology, reported Mr. Swartz’s death early Saturday.

Mr. Swartz led an often itinerant life that included dropping out of Stanford, forming companies and organizations, and becoming a fellow at Harvard University’s Edmond J. Safra Center for Ethics.

He formed a company that merged with Reddit, the popular news and information site. He also co-founded Demand Progress, a group that promotes online campaigns on social justice issues — including a successful effort, with other groups, to oppose a Hollywood-backed Internet piracy bill.

But he also found trouble when he took part in efforts to release information to the public that he felt should be freely available. In 2008, he took on PACER, or Public Access to Court Electronic Records, the repository for federal judicial documents.

The database charges 10 cents a page for documents; activists like Carl Malamud, the founder of public.resource.org, have long argued that such documents should be free because they are produced at public expense. Joining Mr. Malamud’s efforts to make the documents public by posting legally obtained files to the Internet for free access, Mr. Swartz wrote an elegant little program to download 20 million pages of documents from free library accounts, or roughly 20 percent of the enormous database.

The government shut down the free library program, and Mr. Malamud feared that legal trouble might follow even though he felt they had violated no laws. As he recalled in a newspaper account, “I immediately saw the potential for overreaction by the courts.” He recalled telling Mr. Swartz: “You need to talk to a lawyer. I need to talk to a lawyer.”

Mr. Swartz recalled in a 2009 interview, “I had this vision of the feds crashing down the door, taking everything away.” He said he locked the deadbolt on his door, lay down on the bed for a while and then called his mother.

The federal government investigated but did not prosecute.

In 2011, however, Mr. Swartz went beyond that, according to a federal indictment. In an effort to provide free public access to JSTOR, he broke into computer networks at M.I.T. by means that included gaining entry to a utility closet on campus and leaving a laptop that signed into the university network under a false account, federal officials said.

Mr. Swartz turned over his hard drives with 4.8 million documents, and JSTOR declined to pursue the case. But Carmen M. Ortiz, a United States attorney, pressed on, saying that “stealing is stealing, whether you use a computer command or a crowbar, and whether you take documents, data or dollars.”

Founded in 1995, JSTOR, or Journal Storage, is nonprofit, but institutions can pay tens of thousands of dollars for a subscription that bundles scholarly publications online. JSTOR says it needs the money to collect and to distribute the material and, in some cases, subsidize institutions that cannot afford it. On Wednesday, JSTOR announced that it would open its archives for 1,200 journals to free reading by the public on a limited basis.

Mr. Malamud said that while he did not approve of Mr. Swartz’s actions at M.I.T., “access to knowledge and access to justice have become all about access to money, and Aaron tried to change that. That should never have been considered a criminal activity.”

Mr. Swartz did not talk much about his impending trial, Quinn Norton, a close friend, said on Saturday, but when he did, it was clear that “it pushed him to exhaustion. It pushed him beyond.”

Recent years had been hard for Mr. Swartz, Ms. Norton said, and she characterized him “in turns tough and delicate.” He had “struggled with chronic, painful illness as well as depression,” she said, without specifying the illness, but he was still hopeful “at least about the world.”

Cory Doctorow, a science fiction author and online activist, posted a tribute to Mr. Swartz on BoingBoing.net, a blog he co-edits. In an e-mail, he called Mr. Swartz “uncompromising, principled, smart, flawed, loving, caring, and brilliant.”

 “The world was a better place with him in it,” he said.

Mr. Swartz, he noted, had a habit of turning on those closest to him: “Aaron held the world, his friends, and his mentors to an impossibly high standard — the same standard he set for himself.” Mr. Doctorow added, however, “It’s a testament to his friendship that no one ever seemed to hold it against him (except, maybe, himself).”

In a talk in 2007, Mr. Swartz described having had suicidal thoughts during a low period in his career. He also wrote about his struggle with depression, distinguishing it from sadness.

“Go outside and get some fresh air or cuddle with a loved one and you don’t feel any better, only more upset at being unable to feel the joy that everyone else seems to feel. Everything gets colored by the sadness.”

When the condition gets worse, he wrote, “you feel as if streaks of pain are running through your head, you thrash your body, you search for some escape but find none. And this is one of the more moderate forms.”

Ravi Somaiya contributed reporting.

This article has been revised to reflect the following correction:

Correction: January 12, 2013

An earlier version of this article incorrectly identified the police who arrested Mr. Swartz, and when they did so. The police were from Cambridge, Mass., not the Massachusetts Institute of Technology campus force, and the arrest occurred two years before Mr. Swartz’s suicide, but not two years to the day.

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Treasury Will Not Mint $1 Trillion Coin to Raise Debt Ceiling

WASHINGTON — The Treasury Department said Saturday that it will not mint a trillion-dollar platinum coin to head off an imminent battle with Congress over raising the government’s borrowing limit.

“Neither the Treasury Department nor the Federal Reserve believes that the law can or should be used to facilitate the production of platinum coins for the purpose of avoiding an increase in the debt limit,” Anthony Coley, a Treasury spokesman, said in a written statement.

The Obama administration has indicated that the only way for the country to avoid a cash-management crisis as soon as next month is for Congress to raise the “debt ceiling,” which is the statutory limit on government borrowing. The cap is $16.4 trillion.

“There are only two options to deal with the debt limit: Congress can pay its bills, or it can fail to act and put the nation into default,” Jay Carney, the White House press secretary, said in a statement. “Congress needs to do its job.”

In recent weeks, some Republicans have indicated that they would not agree to raise the debt limit unless Democrats agreed to make cuts to entitlement programs like Social Security.

The White House has said it would not negotiate spending cuts in exchange for Congressional authority to borrow more, and it has insisted that Congress raise the ceiling as a matter of course, to cover expenses already authorized by Congress. In broader fiscal negotiations, it has said it would not agree to spending cuts without commensurate tax increases.

The idea of minting a trillion-dollar coin drew wide if puzzling attention recently after some bloggers and economic commentators had suggested it as an alternative to involving Congress.

By virtue of an obscure law meant to apply to commemorative coins, the Treasury secretary could order the production of a high-denomination platinum coin and deposit it at the Federal Reserve, where it would count as a government asset and give the country more breathing room under its debt ceiling. Once Congress raised the debt ceiling, the Treasury secretary could then order the coin destroyed.

Mr. Carney, the press secretary, fielded questions about the theoretical tactic at a news conference last week. But the idea is now formally off the table.

The White House has also rejected the idea that it could mount a challenge to the debt ceiling itself, on the strength of the Fourteenth Amendment to the Constitution, which holds that the “validity of the public debt” of the United States “shall not be questioned.”

The Washington Post earlier published a report that the Obama administration had rejected the platinum-coin idea.

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