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“So far we’re seeing basic agreement with our best model of the universe, but we’re also seeing some potentially interesting differences that could indicate that dark energy is evolving with time,”

When the scientists combined their map with other cosmological data, they were surprised to find that it did not quite agree with the otherwise reliable standard model of the universe, which assumes that dark energy is constant and unchanging. A varying dark energy fit the data points better.

“It’s certainly more than a curiosity,” Dr. Palanque-Delabrouille said. “I would call it a hint. Yeah, it’s not yet evidence, but it’s interesting.”

But this version of dark energy is merely the simplest one. “With DESI we now have achieved a precision that allows us to go beyond that simple model,” Dr. Palanque-Delabrouille said, “to see if the density of dark energy is constant over time, or if it has some fluctuations and evolution with time.”

“While combining data sets is tricky, and these are early results from DESI, the possible evidence that dark energy is not constant is the best news I have heard since cosmic acceleration was firmly established 20-plus years ago.”

praised the new survey as “superb data.” The results, she said, “open the potential for a new window into understanding dark energy, the dominant component of the universe, which remains the biggest mystery in cosmology. Pretty exciting.”

what if dark energy were not constant as the cosmological model assumed?

At issue is a parameter called w, which is a measure of the density, or vehemence, of the dark energy. In Einstein’s version of dark energy, this number remains constant, with a value of –1, throughout the life of the universe. Cosmologists have been using this value in their models for the past 25 years.

Dark energy took its place in the standard model of the universe known as L.C.D.M., composed of 70 percent dark energy (Lambda), 25 percent cold dark matter (an assortment of slow-moving exotic particles) and 5 percent atomic matter. So far that model has been bruised but not broken by the new James Webb Space Telescope

As a measure of distance, the researchers used bumps in the cosmic distribution of galaxies, known as baryon acoustic oscillations. These bumps were imprinted on the cosmos by sound waves in the hot plasma that filled the universe when it was just 380,000 years old. Back then, the bumps were a half-million light-years across. Now, 13.5 billion years later, the universe has expanded a thousandfold, and the bumps — which are now 500 million light-years across — serve as convenient cosmic measuring sticks.

The DESI scientists divided the past 11 billion years of cosmic history into seven spans of time. (The universe is 13.8 billion years old.) For each, they measured the size of these bumps and how fast the galaxies in them were speeding away from us and from each other.

When the researchers put it all together, they found that the usual assumption — a constant dark energy — didn’t work to describe the expansion of the universe. Galaxies in the three most recent epochs appeared closer than they should have been, suggesting that dark energy could be evolving with time.

Dr. Riess of Johns Hopkins, who had an early look at the DESI results, noted that the “hint,” if validated, could pull the rug out from other cosmological measurements, such as the age or size of the universe. “This result is very interesting and we should take it seriously,” he wrote in his email. “Otherwise why else do we do these experiments?”

They’re joined by the tee-totaling kids of Iceland, the Netherlands and, believe it or not, Italy.

Kids appear to be much more likely to get drunk in former Soviet states, particularly the Baltic states, and in Finland

Hawks in the Bush administration like Vice President Dick Cheney urged Mr. Bush to consider a military strike against the Iranian nuclear facilities before they could produce fuel suitable for a weapon. Several times, the administration reviewed military options and concluded that they would only further inflame a region already at war, and would have uncertain results.

The first stage in the effort was to develop a bit of computer code called a beacon that could be inserted into the computers, which were made by the German company Siemens and an Iranian manufacturer, to map their operations. The idea was to draw the equivalent of an electrical blueprint of the Natanz plant, to understand how the computers control the giant silvery centrifuges that spin at tremendous speeds. The connections were complex, and unless every circuit was understood, efforts to seize control of the centrifuges could fail.

The first attacks were small, and when the centrifuges began spinning out of control in 2008, the Iranians were mystified about the cause, according to intercepts that the United States later picked up.

The unusually tight collaboration with Israel was driven by two imperatives. Israel’s Unit 8200, a part of its military, had technical expertise that rivaled the N.S.A.’s, and the Israelis had deep intelligence about operations at Natanz that would be vital to making the cyberattack a success.

Soon the two countries had developed a complex worm that the Americans called “the bug.” But the bug needed to be tested. So, under enormous secrecy, the United States began building replicas of Iran’s P-1 centrifuges, an aging, unreliable design that Iran purchased from Abdul Qadeer Khan, the Pakistani nuclear chief who had begun selling fuel-making technology on the black market.

“This is the first attack of a major nature in which a cyberattack was used to effect physical destruction,” rather than just slow another computer, or hack into it to steal data.

It took months for the beacons to do their work and report home, complete with maps of the electronic directories of the controllers and what amounted to blueprints of how they were connected to the centrifuges deep underground. Then the N.S.A. and a secret Israeli unit respected by American intelligence officials for its cyberskills set to work developing the enormously complex computer worm that would become the attacker from within.

the code would lurk inside the plant for weeks, recording normal operations; when it attacked, it sent signals to the Natanz control room indicating that everything downstairs was operating normally. “This may have been the most brilliant part of the code,” one American official said.

the Iranians had grown so distrustful of their own instruments that they had assigned people to sit in the plant and radio back what they saw.

Mr. Bush urged him to preserve two classified programs, Olympic Games and the drone program in Pakistan. Mr. Obama took Mr. Bush’s advice.

Mr. Obama authorized the attacks to continue, and every few weeks — certainly after a major attack — he would get updates and authorize the next step. Sometimes it was a strike riskier and bolder than what had been tried previously. “From his first days in office, he was deep into every step in slowing the Iranian program — the diplomacy, the sanctions, every major decision,” a senior administration official said. “And it’s safe to say that whatever other activity might have been under way was no exception to that rule.”

In the summer of 2010, shortly after a new variant of the worm had been sent into Natanz, it became clear that the worm, which was never supposed to leave the Natanz machines, had broken free, like a zoo animal that found the keys to the cage.

An error in the code, they said, had led it to spread to an engineer’s computer when it was hooked up to the centrifuges. When the engineer left Natanz and connected the computer to the Internet, the American- and Israeli-made bug failed to recognize that its environment had changed. It began replicating itself all around the world.

“We think there was a modification done by the Israelis,” one of the briefers told the president, “and we don’t know if we were part of that activity.”

Mr. Obama, according to officials in the room, asked a series of questions, fearful that the code could do damage outside the plant. The answers came back in hedged terms. Mr. Biden fumed. “It’s got to be the Israelis,” he said. “They went too far.”

American cyberattacks are not limited to Iran, but the focus of attention, as one administration official put it, “has been overwhelmingly on one country.” There is no reason to believe that will remain the case for long. Some officials question why the same techniques have not been used more aggressively against North Korea. Others see chances to disrupt Chinese military plans, forces in Syria on the way to suppress the uprising there, and Qaeda operations around the world. “We’ve considered a lot more attacks than we have gone ahead with,” one former intelligence official said.

In fact, no country’s infrastructure is more dependent on computer systems, and thus more vulnerable to attack, than that of the United States. It is only a matter of time, most experts believe, before it becomes the target of the same kind of weapon that the Americans have used, secretly, against Iran.

Such information would allow detection of so-called Mendelian disorders, like cystic fibrosis, Tay-Sachs disease and Marfan syndrome, which are caused by mutations in a single gene.

Intel, founded by Gordon Moore and Robert Noyce, both physicists, began by building memory chips that were twice as fast as old ones. Sun Microsystems introduced a new kind of modular computer system, built by one of its founders, Andy Bechtolsheim. Their “big ideas” were expressed in physical products and grew out of their own technical expertise. In that light, Meraki, which came from Biswas’s work at M.I.T., can be seen as having its origins in the old guard. And it followed what was for decades the highway that connected academia to industry: Grad students researched technology, powerful advisers brokered deals, students dropped out to parlay their technologies into proprietary solutions, everyone reaped the profits. That implicit guarantee of academia’s place in entrepreneurship has since disappeared. Graduate students still drop out, but to start bike-sharing apps and become data scientists. That is, if they even make it to graduate school. The success of self-educated savants like Sean Parker, who founded Napster and became Facebook’s first president with no college education to speak of, set the template. Enstitute, a two-year apprenticeship, embeds high-school graduates in plum tech positions. Thiel Fellowships, financed by the PayPal co-founder and Facebook investor Peter Thiel, give $100,000 to people under 20 to forgo college and work on projects of their choosing.

Much of this precocity — or dilettantism, depending on your point of view — has been enabled by web technologies, by easy-to-use programming frameworks like Ruby on Rails and Node.js and by the explosion of application programming interfaces (A.P.I.s) that supply off-the-shelf solutions to entrepreneurs who used to have to write all their own code for features like a login system or an embedded map. Now anyone can do it, thanks to the Facebook login A.P.I. or the Google Maps A.P.I.

One of the more enterprising examples of these kinds of interfaces is the start-up Stripe, which sells A.P.I.s that enable businesses to process online payments. When Meraki first looked into taking credit cards online, according to Biswas, it was a monthslong project fraught with decisions about security and cryptography. “Now, with Stripe, it takes five minutes,” he said. “When you combine that with the ability to get a server in five minutes, with Rails and Twitter Bootstrap, you see that it has become infinitely easier for four people to get a start-up off the ground.”

The sense that it is no longer necessary to have particularly deep domain knowledge before founding your own start-up is real; that and the willingness of venture capitalists to finance Mark Zuckerberg look-alikes are changing the landscape of tech products. There are more platforms, more websites, more pat solutions to serious problems

There’s a glass-half-full way of looking at this, of course: Tech hasn’t been pedestrianized — it’s been democratized. The doors to start-up-dom have been thrown wide open. At Harvard, enrollment in the introductory computer-science course, CS50, has soared

many of the hottest web start-ups are not novel, at least not in the sense that Apple’s Macintosh or Intel’s 4004 microprocessor were. The arc of tech parallels the arc from manufacturing to services. The Macintosh and the microprocessor were manufactured products. Some of the most celebrated innovations in technology have been manufactured products — the router, the graphics card, the floppy disk

One of Stripe’s founders rowed five seat in the boat I coxed freshman year in college; the other is his older brother. Among the employee profiles posted on its website, I count three of my former teaching fellows, a hiking leader, two crushes. Silicon Valley is an order of magnitude bigger than it was 30 years ago, but still, the start-up world is intimate and clubby, with top talent marshaled at elite universities and behemoths like Facebook and Google.

Part of the answer, I think, lies in the excitement I’ve been hinting at. Another part is prestige. Smart kids want to work for a sexting app because other smart kids want to work for the same sexting app. “Highly concentrated pools of top talent are one of the rarest things you can find,” Biswas told me, “and I think people are really attracted to those environments.

The latter source of frustration is the phenomenon of “the 10X engineer,” an engineer who is 10 times more productive than average. It’s a term that in its cockiness captures much of what’s good, bad and impossible about the valley. At the start-ups I visit, Friday afternoons devolve into bouts of boozing and Nerf-gun wars. Signing bonuses at Facebook are rumored to reach the six digits. In a landscape where a product may morph several times over the course of a funding round, talent — and the ability to attract it — has become one of the few stable metrics.

there is a surprising amount of angst in Silicon Valley. Which is probably inevitable when you put thousands of ambitious, talented young people together and tell them they’re god’s gift to technology. It’s the angst of an early hire at a start-up that only he realizes is failing; the angst of a founder who raises $5 million for his company and then finds out an acquaintance from college raised $10 million; the angst of someone who makes $100,000 at 22 but is still afraid that he may not be able to afford a house like the one he grew up in.

San Francisco, which is steadily stealing the South Bay’s thunder. (“Sometime in the last two years, the epicenter of consumer technology in Silicon Valley has moved from University Ave. to SoMa,” Terrence Rohan, a venture capitalist at Index Ventures, told me

Both the geographic shift north and the increasingly short product cycles are things Jim attributes to the rise of Amazon Web Services (A.W.S.), a collection of servers owned and managed by Amazon that hosts data for nearly every start-up in the latest web ecosystem.Continue reading the main story

now, every start-up is A.W.S. only, so there are no servers to kick, no fabs to be near. You can work anywhere. The idea that all you need is your laptop and Wi-Fi, and you can be doing anything — that’s an A.W.S.-driven invention.”

This same freedom from a physical location or, for that matter, physical products has led to new work structures. There are no longer hectic six-week stretches that culminate in a release day followed by a lull. Every day is release day. You roll out new code continuously, and it’s this cycle that enables companies like Facebook, as its motto goes, to “move fast and break things.”

A few weeks ago, a programmer friend and I were talking about unhappiness, in particular the kind of unhappiness that arises when you are 21 and lavishly educated with the world at your feet. In the valley, it’s generally brought on by one of two causes: coming to the realization either that your start-up is completely trivial or that there are people your own age so knowledgeable and skilled that you may never catch up.

These days, a new college graduate arriving in the valley is merely stepping into his existing network. He will have friends from summer internships, friends from school, friends from the ever-increasing collection of incubators and fellowships.

As tech valuations rise to truly crazy levels, the ramifications, financial and otherwise, of a job at a pre-I.P.O. company like Dropbox or even post-I.P.O. companies like Twitter are frequently life-changing. Getting these job offers depends almost exclusively on the candidate’s performance in a series of technical interviews, where you are asked, in front of frowning hiring managers, to whip up correct and efficient code.

Moreover, a majority of questions seem to be pulled from undergraduate algorithms and data-structures textbooks, which older engineers may have not laid eyes on for years.

our tradition by and large has used religion to hold the nation in judgment and to assert that it should operate under higher moral standards.”

the authors found that Americans were concerned increasingly with individual attainment and far less with forging the collective ties that had traditionally bound communities.

God, the article noted, was ritually invoked on particular state occasions: every presidential Inaugural Address except Washington’s second, Professor Bellah wrote, contained at least one reference to a divine presence.

“The fundamental question we posed,” they wrote, “was how to preserve or create a morally coherent life.”

“Though much is selectively derived from Christianity, this religion is clearly not itself Christianity.”

We are concerned that this individualism may have grown cancerous

Bellah’s last major work, “Religion in Human Evolution,” was a 700-page synthesis of a subject about which he had thought deeply since the 1950s: the origin, development and use of mankind’s myriad varieties of religious experience from the dawn of our species through the first millennium B.C.

“It shows how religion is enacted in history and cannot be grasped outside it.”

Secretary of State John Kerry said at a news conference in the United Arab Emirates that the Obama administration was not in a “race” to strike a deal.

In the past, the agency has questioned whether the Gachin mine, which produces yellowcake uranium for conversion to nuclear fuel, is linked to Iran’s military. The heavy-water plant at Arak could produce plutonium, which can be used in a weapon, and a key concern is that once the plant is operational, it would be all but impossible to destroy it without running the risk of spreading deadly plutonium. Western officials noted that the agreement gave the atomic agency access to the heavy production plant but not the nuclear reactor, which is under construction there.

lack of in-depth information and inspections of the heavy-water plant have been a particular worry to the West. French officials went further and indicated that they wanted construction halted altogether at the facility, and that Iran’s failure to agree to that was one reason the French were reluctant to endorse a broader deal with Iran this weekend.

The agreement on Monday comprised a four-paragraph statement and six bullet points in an annex of issues to be tackled within the next three months.

“Managed access” is a term used by the United Nations agency to denote the ground rules for inspections that permit host countries to protect information they consider to be proprietary or secret, such as military technology, while still allowing inspectors to garner data they require, officials said.

its electorate represents an older version of America, more rural, white and conservative than elsewher

he is a type of leader Appalachia has seen before. Students of history will recognize that Mr. Trump is a Jackson man.

the states where Mr. Trump is strongest are the ones that most consistently favored Jackson during his three runs for the White House.

What Mr. Trump borrows from Jackson is not an issue, but a way of thinking about the world. Mr. Trump promises to fix his supporters’ problems, no matter who else is hurt. He’s a wealthy celebrity always ready for a fight, a superpatriot who says he will make America great again. He vows to attack government corruption and defend the common man. All this could be said of Jackson.

Jackson had a captivating style, and not just because of his wild hair. He did what he wanted, and demanded respect

Like Mr. Trump, Jackson made his fortune in real estate. He bought and sold vast tracts of Southern land in concert with wealthy friends. If desirable land was owned by Indians, Jackson bullied or bribed them into selling it cheap.

And again like Mr. Trump, a former Democrat and independent, Jackson did not worry about consistency. Having joined the nation’s wealthy elite, he ran for president as an opponent of wealthy elites. He defended liberty while operating a personal empire of cotton plantations using hundreds of enslaved black laborers.

Jackson and his Democratic Party enforced a certain idea of America — an America for white people. Jackson was personally cordial to people of other races, but their rights did not concern him.

. Jackson’s old coalition no longer dominates the electorate. Nonwhite voters are growing in numbers, and many white voters have told pollsters they would be embarrassed by Mr. Trump as president.

Among them are variations on a proposal that exploded in Indiana last year, when controversy over a so-called religious freedom law became a flashpoint in the ongoing debate over religious belief and legal equality. The Hoosier State’s measure led to an estimated $60 million in lost revenue, and after weeks of economic and political pressure, Indiana Governor Mike Pence approved revisions to the law clarifying that businesses couldn’t use it to turn away LGBT patrons.

To many supporters, these bills are necessary to protect deeply held religious beliefs and are worth the controversy and lost revenue. To critics, however, the measures seemed aimed at allowing people to treat LGBT citizens differently, based on moral opposition to homosexuality and transgenderism, and serve as a reminder that the lessons of the Indiana fight were fleeting.

The fight in South Dakota echoes earlier clashes over gender identity and bathroom use of transgender people. The sponsor of the South Dakota bathroom measure, state Rep. Fred Deutsch, has argued in committee testimony that it is necessary to protect the “bodily privacy rights” of “biologic boys and girls” and that transgender students should be offered alternate accommodations if they do not wish to use the facilities that correspond to their sex assigned at birth.

The fight has played out at the state level largely because there is no federal law that bans discrimination based on sexual orientation or gender identity. The Equality Act, a federal bill that would create such protections, is unlikely to go anywhere in a Republican-controlled Congress.

Rebecca Dodds, the mother of a transgender son who recently graduated from high school in the state’s famed Black Hills, said compelling students to use a separate facility could force them to out themselves to their peers, which could lead to harassment or violence.

Though the bill does not specify what those accommodations would be, schools that have dealt with conflicts over bathroom use have often instructed transgender students to use staff or nurse facilities, or facilities in buildings separate from their peers. The Department of Justice has issued several rulings and opinions that say such treatment of transgender students amounts to sex discrimination under Title IX, though federal courts are still weighing the issue.

It extends protections for people with three moral beliefs that are laid out in the bill’s text: (1) Marriage is or should only be recognized as the union of one man and one woman (2) Sexual relations are properly reserved to marriage (3) The terms male or man and female or woman refer to distinct and immutable biological sexes that are determined by anatomy and genetics by the time of birth.

While critics worry about such bills being used to turn away LGBT people from housing, jobs or businesses, they also worry it could open the door to a broader insertion of personal morality in the public sphere. A pharmacist might, for instance, refuse to fill a birth control prescription for an unmarried woman or a child care agency might refuse to look after a boy or girl with gay parents, without risk of losing their state licenses.

Speaking in support of the bathroom bill, a representative from South Dakota Citizens for Liberty said the measure offers a good compromise: “It allows for the sensitive accommodation of students who are experiencing personal trials,” Florence Thompson testified at a hearing of the Senate education committee on Feb. 11. “And does so without giving preferential treatment to a tiny segment of the student population at the expense of the privacy rights of the vast majority.”

Meanwhile, the majority of states lack LGBT non-discrimination laws, although a bill in Pennsylvania will likely add sexual orientation and gender identity to the state’s non-discrimination protections.

In Georgia, where lawmakers are considering at least four religious freedom bills, a group of businesses—including Coca-Cola, AT&T and Delta—has formed to promote “inclusive” policies, explicitly mentioning sexual orientation and gender identity as qualities that should be respected.

In South Dakota, dollars and cents may determine whether the bathroom bill passes too, with the ACLU arguing that the passage of such a law would put the state in direct conflict with federal policy—and therefore all but guarantee costly litigation for school districts that are forced to choose to follow one or the other. Failing to comply with guidance from the Department of Education, which has said that students’ gender identities must be respected, could run the risk of costing local districts hundreds of millions in federal funds.

Yet supporters like Deutsch say that the guidance coming from the federal government is the reason such bills are needed, so that South Dakota won’t be pressured into providing facility access for transgender students that is not yet explicitly laid out in federal law.