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students who read a passage, then took a test asking them to recall what they had read, retained about 50 percent more of the information a week later than students who used two other methods.

the illusion that they know material better than they do.

“I think that learning is all about retrieving, all about reconstructing our knowledge,” said the lead author, Jeffrey Karpicke, an assistant professor of psychology at Purdue University. “I think that we’re tapping into something fundamental about how the mind works when we talk about retrieval.”

Stanford University on artificial intelligence, to be taught this fall by two leading experts from Silicon Valley, has attracted more than 58,000 students around the globe — a class nearly four times the size of Stanford’s entire student body.

For example, the Khan Academy, which focuses on high school and middle school, intentionally turns the relationship of the classroom and homework upside down. Students watch lectures at home, then work on problem sets in class, where the teacher can assist them one on one.

Dr. Widom said that having Stanford courses freely available could both assist and compete with other colleges and universities.

a student reprimanded for copying from Wikipedia in a paper on the Great Depression said he thought its entries — unsigned and collectively written — did not need to be credited since they counted, essentially, as common knowledge.

“It’s a cheap education, not because it benefits the students,” said Karen Aronowitz, president of the teachers’ union in Miami, where 7,000 high school students were assigned to study online in computer labs this year because there were not enough teachers to comply with state class-size caps. “This is being proposed for even your youngest students,” Ms. Aronowitz said. “Because it’s good for the kids? No. This is all about cheap.”

But administrators insisted that their chief motive was to enhance student learning, not save money in a year when the 108,000-student district is braced for cuts of $100 million and hundreds of jobs. “What the online environment does is continue to provide rich offerings and delivery systems to our students with these resource challenges,” said Irving Hamer, the deputy superintendent.

Teachers’ unions and others say much of the push for online courses, like vouchers and charter schools, is intended to channel taxpayers’ money into the private sector. “What they want is to substitute technology for teachers,” said Alex Molnar, professor of education policy at Arizona State University. In Idaho, Gov. C. L. Otter and the elected superintendent of public instruction, Tom Luna, both Republicans, promoted giving students laptops and requiring online courses. The State Legislature, pressed by critics who said the online mandate would cost teachers jobs, rejected it, but Mr. Luna said in an interview that he would propose it this summer through the State Board of Education, which supports him. “I have no doubt we’ll get a robust rule through them,” he said. Four online courses is “going to be the starting number.”

At SUNY, which has 468,000 students at 64 campuses, the Coursera partnership is tied to Chancellor Nancy L. Zimpher’s announcement this year of Open SUNY, an online effort to enroll 100,000 new students and make it possible for a quarter of them to earn a degree in three years.

“We hope this will help public universities do more with the less they’re getting in state support,” Dr. Koller said.

In the 21st century, high-speed Internet access is almost as essential as electricity. That libraries serve as the provider for millions of Americans isn't something to celebrate. It's a sign that we're in trouble. We're depriving people of basic information access that is central to every policy we care about – including health, education and national security – even though every American should be able to communicate reliably and access information at any time.

In rural America, only 60 percent of households use broadband Internet service, according to a report released Thursday by the Department of Commerce. That is 10 percent less than urban households. Over all, 28 percent of Americans do not use the Internet at all.

It took her three days to try to arrange a meeting with the governor 150 miles away in Montgomery because such inquiries cannot be made over the phone and she had to drive 45 minutes to her daughter’s house to use e-mail.

FACE-TO-FACE conversation unfolds slowly. It teaches patience. W

We are tempted to think that our little “sips” of online connection add up to a big gulp of real conversation. But they don’t. E-mail, Twitter, Facebook, all of these have their places — in politics, commerce, romance

registered 680,000 students in 43 courses

massive open online courses, or MOOCs, that are expected to draw millions of students and adult learners globally.

free online artificial intelligence course attracted 160,000 students from 190 countries.

Perhaps there’s a nicer way to put it. “The baby boomers seem to see technology as information and communication,” said Prof. Michael Bugeja, director of the journalism school at Iowa State University and the author of “Interpersonal Divide: The Search for Community in a Technological Age.” “Their offspring and the emerging generation seem to see the same devices as entertainment and socializing.”

The fact is, we’re not here to entertain. We’re here to stimulate the life of the mind.”

Mr. Reshef sees his project as a way to use the Internet to bring higher education to poor students around the world.

The university is not accredited, and it offers programs only in business administration and computer science. But in June, it got two votes of confidence: New York University announced a partnership under which unusually promising but needy University of the People students might be able to enroll at N.Y.U.’s Abu Dhabi campus and receive financial aid, and Hewlett-Packard announced an internship program, saying it believed strongly “in the work UoPeople is doing to democratize higher education.”

Last week 34 mathematicians issued a statement denouncing “a system in which commercial publishers make profits based on the free labor of mathematicians and subscription fees from their institutions’ libraries, for a service that has become largely unnecessary.”

For 2010, Elsevier reported a 36 percent profit on revenues of $3.2 billion

Mr. Thrun sent the 23,000 students who completed the Artificial Intelligence course a PDF file (suitable for framing) by e-mail showing their percentile score, but not the Stanford name; 248 students, none from Stanford, earned grades of 100 percent.

“Take yourself out of autopilot,” she said. And eventually expand that “being in the moment” to other parts of your life.