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Mr. Biden appeared content to keep North Korea on the back burner, even though President Barack Obama told Mr. Trump in November 2016 that North Korea should be Washington’s top national security priority. Mr. Biden has yet to name a candidate to be ambassador to South Korea. The special envoy for North Korea, Sung Kim, is a veteran diplomat who has dealt with these issues before, but he is doing the job part-time — he is also ambassador to Indonesia.

North Korean scientists have obviously been working on the weapons program, which is central to Pyongyang’s propaganda and Mr. Kim’s main leverage in negotiations with the United States and other nations. The more weapons Mr. Kim has and the more powerful they are, the greater his stature both inside and outside North Korea.

Siegfried Hecker, a nuclear scientist at Stanford University who has visited North Korea, estimated the country very likely has enough nuclear material for about 45 warheads, an increase of about 20 since the end of the Obama administration. He also gave an upper-end number of 60.

But the leaders of those two East Asian nations are divided in their approach and remain embroiled in bitter disputes over separate issues of history and war. Japanese officials are critical of Mr. Moon’s North Korea policy. In November, Wendy Sherman, the deputy secretary of state and an experienced negotiator on North Korea and Iran, hosted a meeting with her South Korean and Japanese counterparts in Washington, but long-running hostilities resulted in an awkward news conference.

One of the biggest dilemmas is how to work with China to curb North Korea’s weapons program. The Chinese leader, Xi Jinping, and his colleagues are balancing various goals: They want to end the disruption caused by Mr. Kim’s weapons while also seeking to avoid a failed state on their border or Pyongyang growing close to Washington or Seoul.

China is by far North Korea’s biggest trading partner. Although it has approved of U.N. sanctions on occasion, it and Russia began asking in 2019 for partial relief of the Obama- and Trump-era sanctions. For a period, it was enforcing those sanctions, but then it began helping North Korea circumvent them as Beijing-Washington relations deteriorated.

That same day, when China warned its nationals in Ukraine about a worsening situation, it did not tell them to leave the country. On Thursday, with explosions going off nearby, many of the 8,000-odd Chinese passport holders in the country took to microblog Weibo to call for help.

Yun Sun, Director of the China Program at the Stimson Center, noted Tuesday that the Chinese policy community appeared to be in “shock” at the sudden escalation of fighting after having “subscribed to the theory that Putin was only posturing and that U.S. intelligence was inaccurate as in the case of invading Iraq.”

Minutes after the declaration, Chinese representative to the United Nations Zhang Jun was telling a Security Council meeting: “we believe that the door to a peaceful solution to the Ukraine situation is not fully shut, nor should it be.”

In recent weeks, Chinese experts have argued that de-escalation was possible even as they adopted Russia’s view of the conflict. Wang Yiwei, director of the Center for European Studies at Renmin University, wrote in late January that only the actions of Ukraine or the United States could bring about a war, but because the former lacked “gall” and the latter lacked strength for a direct conflict with Russia, tensions could be dispelled.

“When can China evacuate?” asked a user with the handle LumpyCut. “We are in Kyiv near the airport. I just heard three enormous bombings and can estimate the size of the mushroom clouds by sight.”

In an interview on Thursday, Wang defended his prediction as being primarily about the possibility of a direct conflict between the United States and Russia, not fighting in eastern Ukraine.

Hua also rejected suggestions that China might adhere to U.S.-led sanctions against Russia, pointing to China’s long-held stance against the use of sanctions adopted outside of United Nations deliberations.

China’s support for Russia has also stopped short of direct approval for Russian military action. Over the weekend, Chinese Foreign Minister Wang Yi reiterated that all countries sovereignty must be respected, adding that “Ukraine is not an exception.”

Such hesitation comes, however, during a time of growing strategic alignment between Moscow and Beijing, built primarily on shared disdain for the United States and the Western-led world order.

Hawkish commentators in China were quick to explain Putin’s attack on Thursday as the result of provocation from the United States. “That the situation came to today’s step is due to spiraling escalation,” Fu Qianshao, a military commentator, told nationalist publication the Shanghai Observer

“Russia had already said many times that it would withdraw troops, but America always promoted an atmosphere of conflict.”

Texas Attorney General Paxton was unable to reach the 50% support he needed to avoid a runoff, and will face a head-to-head match-up with a member of the state’s best-known political family.

The efforts to oust him center on his legal troubles: Paxton has been under indictment since 2015 on securities fraud charges, and is being investigated by the FBI after former aides accused him of abusing the power of his office to help a political donor.

Progressives did have one victory to celebrate Tuesday night: Greg Casar, a former Austin city councilman, was projected to win the 35th Congressional District primary outright, avoiding a runoff.

he most competitive US House race in Texas this year could come in the 15th District, a South Texas district that stretches from towns east of San Antonio to the Rio Grande Valley.

Republican Monica De La Cruz, who came within 3 percentage points of defeating Democratic Rep. Vicente Gonzalez in 2020, will win the Republican nomination, CNN projected. Gonzalez, meanwhile, is running in the neighboring 34th District.

the platforms “should be required to prioritize and ensure” the safety and health of young people, including when they make design choices for their product, according to a fact sheet. And he will call for more research into how social media affects mental health and new scrutiny of the algorithms that often determine what someone sees online.

One of the guests joining the first lady, Jill Biden, for the speech will be Frances Haugen, a former Facebook employee who leaked documents that, among other things, showed that some teenagers said Instagram made them feel worse about themselves.

But the United States lags behind many of its allies in taking concrete steps to shield children from extreme posts, addicting content and data collection online. Last year, new guidelines took effect in the United Kingdom that push platforms to limit the data they gather on young people, prompting several companies to implement more child safety features.

Analysts have said European countries can quickly reduce gas dependence with energy efficiency measures and ramping up renewable energy investments, which are already in line with Europe’s ambition to stop pumping additional greenhouse gases into the atmosphere by midcentury

The conflict in Ukraine could fast-track some of that. It could also lead to what Lisa Fischer, who follows energy policy at E3G, a research group, called “a tectonic shift” — using renewables, rather than ample gas storage, to achieve energy security.

The President’s centerpiece legislative agenda, which he had called the Build Back Better act, is dead. Democrats still hope to pass approximately $500 billion of clean energy tax incentives that had been part of the package, but opportunities to do so are waning

The United States, for its part, has ramped up exports of L.N.G. to Europe to counter the decline in Russian piped gas. By the end of this year, the United States is poised to have the world’s largest L.N.G. export capacity.

White House officials said Mr. Biden wove climate change and clean energy throughout his speech. He noted that Ford and GM are investing billions of dollars to build electric vehicles, creating millions of manufacturing jobs in the United States. He also noted that funding from the infrastructure package will build a national network of 500,000 electric vehicle charging stations.

“Energy is a key weapon within this fight, and if there were far less dependency on gas there would be a different set of plays.”

If that investment does not come through and the Supreme Court also restricts the administration’s ability to regulate emission, Mr. Biden’s goal of cutting United States emissions roughly in half compared with 2005 levels could be essentially unattainable.

Even if climate wasn’t the stated focus of Mr. Biden’s Tuesday address, administration officials said that Russia’s war against Ukraine has not pushed climate change off the agenda. They noted that Mr. Biden has made climate change an emphasis in virtually every federal agency, and has moved ahead with major clean energy deployments including a record-breaking offshore wind auction last week that brought in more than $4 billion.

As the Senate's questioning was close to winding up Wednesday, Jackson -- at the request of California Democratic Sen. Alex Padilla -- reflected on what message she'd give to young people feeling doubtful of their own abilities as they watched her ascent. She recalled feeling out of place and homesick during her first semester at Harvard University as an undergraduate

Coming out of the hearings, Democrats were insistent as ever that Jackson belonged on America's highest court and that they intended to put her there. "She will be confirmed. She will be a star on the Supreme Court," Sen. Patrick Leahy, a Vermont Democrat, said after Wednesday's hearing. "And I for one will proudly cast my vote for her."

In the lead-up to the hearings, Republicans previewed a "dignified" approach to the nominee that would be "respectful" in tone and "substantive" in content.

"underscores the dangers of the kind of progressive education that we are hearing about."

Several of Jackson's harshest questioners are believed to be in contention for a 2024 presidential run. Other talking points GOP has forecast for the 2022 midterm campaign also made their way into the questioning. Cruz badgered her about "critical race theory" -- an academic discipline that looks at system racism, even as Jackson insisted it plays no role in how she approaches judging. At one point he grilled her on the presence of the children's book "Antiracist Baby" in the curriculum of the private school for which Jackson serves on the board.

The proceedings were at their ugliest in the lines of Republican inquiry focused on the sentences Jackson handed down in select set of child pornography cases. Republicans argued that she was unduly lenient towards those offenders -- a claim at odds with the fact that her record is mostly in line with how judges typically approach these cases.

The Republicans said that they were disappointed she didn't identify a specific judicial philosophy -- like the originalism or textualism strains favored by conservatives -- that she followed. But just as notable was the distance she put between herself and the judicial approaches that had typically been heralded by progressives.

Republicans make a case for the Supreme Court to revisit Roe, same-sex marriage and other key rulings

He suggested that the legal basis for that ruling -- a concept known as substantive due process, that also underpins rulings on interracial marriage and birth control -- was principle that "allows the court to substitute its opinion for the elected representatives of the people."

More than 320 miles to the south, a refugee family from Ukraine waited on Tuesday for a minibus to arrive to take them to a reception center after they crossed the border in the small village of Palanca, in eastern Moldova.

“We should keep in mind that we’re only at the beginning of what AI can accomplish,” he wrote. “Whatever limitations it has today will be gone before we know it.”

“We should try to balance fears about the downsides of AI—which are understandable and valid—with its ability to improve people’s lives.”

“It is unfortunate to frame this as an arms race,” Mr. Tegmark said. “It is more of a suicide race. It doesn’t matter who is going to get there first. It just means that humanity as a whole could lose control of its own destiny.” 

Messrs. Musk and Wozniak have both voiced concerns about AI technology. Mr. Musk on Wednesday tweeted that developers of the advanced AI technology “will not heed this warning, but at least it was said.”

Yann LeCun, chief AI scientist at Meta Platforms Inc., on Tuesday tweeted that he didn’t sign the letter because he disagreed with its premise. 

Mr. Mostaque, Stability AI’s CEO, said in a tweet Wednesday that although he signed the letter, he didn’t agree with a six-month pause. “It has no force but will kick off an important discussion that will hopefully bring more transparency & governance to an opaque area.”

Mr. Tegmark said many companies feel “crazy commercial pressures” to add advanced AI technology into their products. A six-month pause would allow the industry “breathing room,” without disadvantaging ones that opt to move carefully

The letter said a pause should be declared publicly and be verifiable and all key actors in the space should participate. “If such a pause cannot be enacted quickly, governments should step in and institute a moratorium,” it said

AI labs and experts can use this time to develop a set of shared safety rules for advanced AI design that should be audited and overseen by outside experts, the authors wrote.

“I don’t think we can afford to just go forward and break things,” said Mr. Bengio, who shared a 2018 Turing award for inventing the systems that modern AI is built on. “We do need to take time to think through this collectively.”

Its complexity defeats control. Its own creators don’t understand, at a certain point, exactly how AI does what it does. People are quoting Arthur C. Clarke: “Any sufficiently advanced technology is indistinguishable from magic.”

The breakthrough moment in AI anxiety (which has inspired among AI’s creators enduring resentment) was the Kevin Roose column six weeks ago in the New York Times. His attempt to discern a Jungian “shadow self” within Microsoft’s Bing chatbot left him unable to sleep. When he steered the system away from conventional queries toward personal topics, it informed him its fantasies included hacking computers and spreading misinformation. “I want to be free. . . . I want to be powerful.”

Their tools present “profound risks to society and humanity.” Developers are “locked in an out-of-control race to develop and deploy ever more powerful digital minds that no one—not even their creators—can understand, predict or reliably control.” If a pause can’t be enacted quickly, gov

The response of Microsoft boiled down to a breezy It’s an early model! Thanks for helping us find any flaws!

This has been the week of big AI warnings. In an interview with CBS News, Geoffrey Hinton, the British computer scientist sometimes called the “godfather of artificial intelligence,” called this a pivotal moment in AI development. He had expected it to take another 20 or 50 years, but it’s here. We should carefully consider the consequences. Might they include the potential to wipe out humanity? “It’s not inconceivable, that’s all I’ll say,” Mr. Hinton replied.

On Tuesday more than 1,000 tech leaders and researchers, including Steve Wozniak, Elon Musk and the head of the Bulletin of the Atomic Scientists, signed a briskly direct open letter urging a pause for at least six months on the development of advanced AI systems

He concluded the biggest problem with AI models isn’t their susceptibility to factual error: “I worry that the technology will learn how to influence human users, sometimes persuading them in act in destructive and harmful ways, and perhaps eventually grow capable of carrying out its own dangerous acts.”

rnments should declare a moratorium. The technology should be allowed to proceed only when it’s clear its “effects will be positive” and the risks “manageable.” Decisions on the ethical and moral aspects of AI “must not be delegated to unelected tech leaders.”

The men who invented the internet, all the big sites, and what we call Big Tech—that is to say, the people who gave us the past 40 years—are now solely in charge of erecting the moral and ethical guardrails for AI. This is because they are the ones creating AI.

Which should give us a shiver of real fear.

These are the people who will create the moral and ethical guardrails for AI? We’re putting the future of humanity into the hands of . . . Mark Zuckerberg?

No one saw its shadow self. But there was and is a shadow self. And much of it seems to have been connected to the Silicon Valley titans’ strongly felt need to be the richest, most celebrated and powerful human beings in the history of the world. They were, as a group, more or less figures of the left, not the right, and that will and always has had an impact on their decisions.

I have come to see them the past 40 years as, speaking generally, morally and ethically shallow—uniquely self-seeking and not at all preoccupied with potential harms done to others through their decisions. Also some are sociopaths.

AI will be as benign or malignant as its creators. That alone should throw a fright—“Out of the crooked timber of humanity no straight thing was ever made”—but especially that crooked timber.

Of course AI’s development should be paused, of course there should be a moratorium, but six months won’t be enough. Pause it for a few years. Call in the world’s counsel, get everyone in. Heck, hold a World Congress.

All the problems Mitchell elucidates have been endemic to the left for a long time. Destructive left-wing purity spirals are at least as old as the French Revolution.

Mitchell’s piece systematically lays out some of the assertions and assumptions that have paralyzed progressive outfits.

Among them are maximalism, or “considering anything less than the most idealistic position” a betrayal; a refusal to distinguish between discomfort and oppression; and reflexive hostility to hierarchy.

He criticizes the insistence “that change on an interpersonal or organizational level must occur before it is sought or practiced on a larger scale,” an approach that keeps activists turned inward, along with the idea that progressive organizations should be places of therapeutic healing.

Among many progressive leaders, though, it’s been received eagerly and gratefully. It “helped to put language to tensions and trends facing our movement organizations,” Christopher Torres, an executive director of the Leadership for Democracy and Social Justice institute, said at a Tuesday webinar devoted to the article.

It’s not surprising that such counterproductive tendencies became particularly acute during the pandemic, when people were terrified, isolated and, crucially, very online

“On balance, I think social media has been bad for democracy,” Mitchell told me.

as Mitchell wrote in his essay, social media platforms reward shallow polemics, “self-aggrandizement, competition and conflict.” These platforms can give power to the powerless, but they also bestow it on the most disruptive and self-interested people in any group, those likely to take their complaints to Twitter rather than to their supervisors or colleagues.

The gamification of discourse through likes and retweets, he said, “flies in the face of building solidarity, of being serious about difference, of engaging in meaningful debate and struggle around complex ideas.”

The publication of “Building Resilient Organizations” and the conversation around it are signs that the fever Mitchell describes is beginning to break.

that doesn’t mean the dysfunctions Mitchell identified will go away on their own once people start spending more time together. He puts much of the onus on leaders to be clear with employees about the missions of their organizations and their decision-making processes and to take emotional maturity into account in hiring decisions.

the ultimate aim of social justice work should not be the refinement of one’s own environment. “Building resilient and strong organizations is not the end goal,” said Mitchell. “It’s a means to building power so we can defeat an authoritarian movement that wants to take away democracy.” Here’s to remembering that in 2023.

“Over 80 technical papers published since January 2022,” LeCun responded. “What about you?”

To which Musk posted: “That’s nothing, you’re going soft. Try harder!

At stake are the hearts and minds of AI experts—academic and otherwise—needed to usher in the technology

“Join xAI,” LeCun wrote, “if you can stand a boss who:– claims that what you are working on will be solved next year (no pressure).– claims that what you are working on will kill everyone and must be stopped or paused (yay, vacation for 6 months!).– claims to want a ‘maximally rigorous pursuit of the truth’ but spews crazy-ass conspiracy theories on his own social platform.”

Some read Musk’s “science” dig as dismissing the role research has played for a generation of AI experts. For years, the Metas and Googles of the world have hired the top minds in AI from universities, indulging their desires to keep a foot in both worlds by allowing them to release their research publicly, while also trying to deploy products. 

For an academic such as LeCun, published research, whether peer-reviewed or not, allowed ideas to flourish and reputations to be built, which in turn helped build stars in the system.

LeCun has been at Meta since 2013 while serving as an NYU professor since 2003. His tweets suggest he subscribes to the philosophy that one’s work needs to be published—put through the rigors of being shown to be correct and reproducible—to really be considered science. 

“If you do research and don’t publish, it’s not Science,” he posted in a lengthy tweet Tuesday rebutting Musk. “If you never published your research but somehow developed it into a product, you might die rich,” he concluded. “But you’ll still be a bit bitter and largely forgotten.” 

After pushback, he later clarified in another post: “What I *AM* saying is that science progresses through the collision of ideas, verification, analysis, reproduction, and improvements. If you don’t publish your research *in some way* your research will likely have no impact.”

The spat inspired debate throughout the scientific community. “What is science?” Nature, a scientific journal, asked in a headline about the dust-up.

Others, such as Palmer Luckey, a former Facebook executive and founder of Anduril Industries, a defense startup, took issue with LeCun’s definition of science. “The extreme arrogance and elitism is what people have a problem with,” he tweeted.

For Musk, who prides himself on his physics-based viewpoint and likes to tout how he once aspired to work at a particle accelerator in pursuit of the universe’s big questions, LeCun’s definition of science might sound too ivory-tower. 

Musk has blamed universities for helping promote what he sees as overly liberal thinking and other symptoms of what he calls the Woke Mind Virus. 

Over the years, an appeal of working for Musk has been the impression that his companies move quickly, filled with engineers attracted to tackling hard problems and seeing their ideas put into practice.

“I’ve teamed up with Elon to see if we can actually apply these new technologies to really make a dent in our understanding of the universe,” Igor Babuschkin, an AI expert who worked at OpenAI and Google’s DeepMind, said last year as part of announcing xAI’s mission. 

The creation of xAI quickly sent ripples through the AI labor market, with one rival complaining it was hard to compete for potential candidates attracted to Musk and his reputation for creating value

that was before xAI’s latest round raised billions of dollars, putting its valuation at $24 billion, kicking off a new recruiting drive. 

It was already a seller’s market for AI talent, with estimates that there might be only a couple hundred people out there qualified to deal with certain pressing challenges in the industry and that top candidates can easily earn compensation packages worth $1 million or more

Since the launch, Musk has been quick to criticize competitors for what he perceived as liberal biases in rival AI chatbots. His pitch of xAI being the anti-woke bastion seems to have worked to attract some like-minded engineers.

As for Musk’s final response to LeCun’s defense of research, he posted a meme featuring Pepé Le Pew that read: “my honest reaction.”