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Or maybe the page has been moved and something else is where it used to be. This is known as “content drift,”

For the law and for the courts, link rot and content drift, which are collectively known as “reference rot,” have been disastrous.

According to a 2014 study conducted at Harvard Law School, “more than 70% of the URLs within the Harvard Law Review and other journals, and 50% of the URLs within United States Supreme Court opinions, do not link to the originally cited information.”

one in five links provided in the notes suffers from reference rot

1961, in Cambridge, J. C. R. Licklider, a scientist at the technology firm Bolt, Beranek and Newman, began a two-year study on the future of the library, funded by the Ford Foundation and aided by a team of researchers that included Marvin Minsky, at M.I.T.

Licklider envisioned a library in which computers would replace books and form a “network in which every element of the fund of knowledge is connected to every other element.”

Licklider’s two-hundred-page Ford Foundation report, “Libraries of the Future,” was published in 1965.

Kahle enrolled at M.I.T. in 1978. He studied computer science and engineering with Minsky.

Vint Cerf, who worked on ARPAnet in the seventies, and now holds the title of Chief Internet Evangelist at Google, has started talking about what he sees as a need for “digital vellum”: long-term storage. “I worry that the twenty-first century will become an informational black hole,” Cerf e-mailed me. But Kahle has been worried about this problem all along.

The Internet Archive is also stocked with Web pages that are chosen by librarians, specialists like Anatol Shmelev, collecting in subject areas, through a service called Archive It, at archive-it.org, which also allows individuals and institutions to build their own archives.

Illien told me that, when faced with Kahle’s proposal, “national libraries decided they could not rely on a third party,” even a nonprofit, “for such a fundamental heritage and preservation mission.”

screenshots from Web archives have held up in court, repeatedly.

Perma.cc has already been adopted by law reviews and state courts; it’s only a matter of time before it’s universally adopted as the standard in legal, scientific, and scholarly citation.

It’s not possible to go back in time and rewrite the HTTP protocol, but Van de Sompel’s work involves adding to it. He and Michael Nelson are part of the team behind Memento, a protocol that you can use on Google Chrome as a Web extension, so that you can navigate from site to site, and from time to time. He told me, “Memento allows you to say, ‘I don’t want to see this link where it points me to today; I want to see it around the time that this page was written, for example.’ ”

Among other things, I now research and write just about every column using an iPad (I still compose many first drafts by speaking into my headphones, but I’m an odd duck).

Jobs declared the iPad to be the future of computing. “PCs are going to be like trucks,”

Like a phone, in most scenarios I find the iPad to be faster, more portable and easier to use and maintain than any traditional P.C. I’ve ever owned.

The iPad still can’t do everything a laptop can, and I still have to log in to a “real” computer sometimes.

the iPad doesn’t work with antiquated work flows that are built for PCs

Twenty children are asked a “big question” such as “Why do we learn history?”, “Is the universe infinite?”, “Should children ever go to prison?” or “How do bees make honey?” They are then left to find the answers using five computers. The ratio of four children to one computer is deliberate: Mitra insists that the children must collaborate. “There should be chaos, noise, discussion and running about,” he says.

. Year 4 children (aged eight to nine) were given questions from GCSE physics and biology papers. After using their Sole computers for 45 minutes, their average test scores on three sets of questions were 25%, 26% and 13%. Three months later – the school having taught nothing on these subjects in the interim – they were tested again, individually and without warning. The scores rose to 57%, 80% and 16% respectively, suggesting the children continued researching the questions in their own time.

he says the main benefit of his methods is that children’s self-confidence increases so that they challenge adult perceptions.

the propositions that children can benefit from collaborative learning and that banning internet use from exams will get trickier, to the point where it may prove futile. It’s worth remembering that new technologies nearly always deliver less than we expect at first and far more than we expect later on, often in unexpected ways.

given leadership positions while remaining in the classroom for their entire careers.

If we continue to treat our teachers like children, what will become of our children?

I quit teaching because I was tired of feeling powerless. Tired of watching would-be professionals treated as children, infantilized into silence. Tired of the machine that turns art into artifice for the sake of test scores. Tired of being belittled, disrespected and looked down upon by lawyers, politicians, and decision-makers who see teaching as the province of provincials, the work of housewives that can be done by anyone.

Other friends try to go on long walks every Sunday, or to “forget” their cellphones at home. A series of tests in recent years has shown, Mr. Carr points out, that after spending time in quiet rural settings, subjects “exhibit greater attentiveness, stronger memory and generally improved cognition. Their brains become both calmer and sharper.”

I noticed that all their talk was of sailing — or riding or bridge: anything that would allow them to get out of radio contact for a few hours.

empathy, as well as deep thought, depends (as neuroscientists like Antonio Damasio have found) on neural processes that are “inherently slow.” The very ones our high-speed lives have little time for.

I’ve yet to use a cellphone and I’ve never Tweeted or entered Facebook. I try not to go online till my day’s writing is finished, and I moved from Manhattan to rural Japan in part so I could more easily survive for long stretches entirely on foot, and every trip to the movies would be an event.

Nothing makes me feel better — calmer, clearer and happier — than being in one place, absorbed in a book, a conversation, a piece of music.

For more than 20 years, therefore, I’ve been going several times a year — often for no longer than three days — to a Benedictine hermitage, 40 minutes down the road, as it happens, from the Post Ranch Inn. I don’t attend services when I’m there, and I’ve never meditated, there or anywhere; I just take walks and read and lose myself in the stillness, recalling that it’s only by stepping briefly away from my wife and bosses and friends that I’ll have anything useful to bring to them.