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U.S. Border Patrol agents responding to a rescue call found a mother and two children, all three unconscious, on an island in the river that separates the United States from Mexico.

The agents were able to resuscitate the mother and the younger child, a 3-year-old boy.

The rescued mother was Guatemalan; her children were both Mexican nationals, the statement said.

n 2019, a father and his daughter from El Salvador died while attempting to cross the river near the border city of Matamoros, Mexico.

the second migrant to drown in the area in less than two weeks, according to the Mexican authorities.

Many have died of heat stroke after getting lost in the remote, rugged arid lands of Arizona.

Those crossing the Rio Grande typically move under cover of darkness.

Many pay smuggling networks hundreds or thousands of dollars to float across on inflatable rings, which are often used to hold both an adult and a child.

A Cuban man died Wednesday night while trying to enter the United States by swimming around the border barrier that stretches into the ocean between Tijuana and San Dieg

The picture of the father and his 23-month-old daughter lying face down along the banks of the Rio Grande, her tiny head tucked inside his T-shirt, an arm draped over his neck, captured worldwide attention.

Humanitarian groups leave water jugs in desolate areas on the migrant trail in Arizona where the terrain and heat pose great risks to crossers.

Since 2004, about 3,400 migrants have perished in southern Arizona.

Last year, 227 bodies were recovered, the most in a decade.

Monthly apprehensions had plummeted to 16,182 in April 2020 as the pandemic prompted former President Donald J. Trump to invoke a public-health emergency to seal the southwestern border to all but essential travel.

A child’s abandoned shoe lies near a river crossing point often used for illegal entries at the U.S.-Mexico border.Credit...

But apprehensions, the key indicator of the volumes of people trying to enter illegally, have climbed every month since then.

Mr. Biden has reversed or loosened some Trump-era restrictions, including the “Remain in Mexico” policy, while he and his top advisers have repeatedly urged migrants not to make the trek.

ut numbers have soared at the border, and Republicans have blamed his new approach for attracting the large numbers of migrants that have overwhelmed border processing facilities.

the Mexican state of Tamaulipas has been refusing to take them back.

The crush of arrivals in the Rio Grande Valley, the busiest migrant gateway, is forcing the Border Patrol to release families even faster than usual to avoid the overcrowding in border processing stations that has drawn sharp criticism from immigrant and child-welfare advocates in the past.

“People back home were saying this is the moment to cross,”

“I couldn’t even make enough for us to eat, things were getting so bad,”

John McCain has Aeschylated it to “a Greek tragedy.” And he should know from Greek tragedy. “It’s the negative campaigning and the increasingly personal attacks,” he told The Boston Herald, adding, “the likes of which we have never seen.” When a man who was accused of having an illegitimate black child in the 2000 South Carolina primary thinks this is the worst ever, the G.O.P. is really in trouble. The Arizona senator, who’s supporting Romney, grimly noted: “I know he’s going to be the nominee, but I also worry about how much damage has been done.”

Once elected, those presidents curbed the id with the ego, common sense and reason. But now the G.O.P.’s id is unbridled. The horse has thrown the rider; the dark forces are bubbling. Moderates, women, gays, Hispanics and blacks — even the president — are being hunted in this most dangerous game.

Asked in Michigan why he couldn’t excite the base, Romney said he is not willing to make “incendiary comments” or “light my hair on fire.”

moderate Republicans feel passé, Senator Olympia Snowe of Maine shockingly announced her retirement, decrying “ ‘my way or the highway’ ideologies” and a vanishing political center.

The apogee of apathy for Romney was on Friday, when the man who says he’s an expert manager spoke to a mostly empty football stadium in Detroit.

he cited his wife’s two Caddies and his Nascar team-owner pals, and awkwardly mocked the plastic ponchos of Daytona racing fans: “I like those fancy raincoats you bought. Really sprung for the big bucks.”

Mitt was damaged as a contender against Obama when he was forced to admit that he had a 15-percent tax rate (given, as The Huffington Post points out, that Romney averaged $6,400 an hour at Bain Capital while creating lots of jobs with paltry wages).

Now Santorum should forfeit his chance after making a far dumber remark: Kids should beware of college because they’ll get brainwashed.

Pandering to Tea Partiers, Santorum, who has a B.A., M.B.A. and J.D., and who supported higher education in his 2006 senatorial campaign, absurdly turned the American dream inside-out and into sauerkraut.

He called the president “a snob” for encouraging people to get more educated and asserted that Obama only wants Americans to go to college so they can be remade in his image, while being indoctrinated by liberal college professors.

Does he think that defining ambition down and asking kids to give up hope is a good mantra? Even Gov. Bob McDonnell of Virginia, who was trying to mandate that women seeking abortions be shamed with vaginal ultrasounds that Democrats dubbed “legal rape,” thought Santorum went too far.

In an interview with ABC News’s George Stephanopoulos, Santorum offended the Catholics he’s courting by saying that the J.F.K. speech ratifying the separation of church and state made him want “to throw up” because Kennedy had thrown “his faith under the bus.” “I don’t believe in an America where the separation of church and state are absolute,” Sanctorum said.

Self-driving cars navigate by GPS. What happens if a self-driving school bus is speeding down the highway and loses its navigation system at 75 mph because of a jammer in the next lane?

Because they are not calculating the trajectory for the stationary fire truck, only for objects in motion (like pedestrians or bicyclists), they can’t react quickly to register a previously stationary object as an object in motion.

If the car was programmed to save the car’s occupants at the expense of pedestrians, the autonomous-car industry is facing its first public moment of moral reckoning.

This kind of blind optimism about technology, the assumption that tech is always the right answer, is a kind of bias that I call technochauvinism.

an overwhelming number of tech people (and investors) seem to want self-driving cars so badly that they are willing to ignore evidence suggesting that self-driving cars could cause as much harm as good

By this point, many people know about the trolley problem as an example of an ethical decision that has to be programmed into a self-driving car.

With driving, the stakes are much higher. In a self-driving car, death is an unavoidable feature, not a bug.

t imagine the opposite scenario: The car is programmed to sacrifice the driver and the occupants to preserve the lives of bystanders. Would you get into that car with your child? Would you let anyone in your family ride in it? Do you want to be on the road, or on the sidewalk, or on a bicycle, next to cars that have no drivers and have unreliable software that is designed to kill you or the driver?

Plenty of people want self-driving cars to make their lives easier, but self-driving cars aren’t the only way to fix America’s traffic problems. One straightforward solution would be to invest more in public transportation.

Public-transportation funding is a complex issue that requires massive, collaborative effort over a period of years. It involves government bureaucracy. This is exactly the kind of project that tech people often avoid attacking, because it takes a really long time and the fixes are complicated.

Plenty of people, including technologists, are sounding warnings about self-driving cars and how they attempt to tackle very hard problems that haven’t yet been solved. People are warning of a likely future for self-driving cars that is neither safe nor ethical nor toward the greater good. Still,  the idea that self-driving cars are nifty and coming soon is often the accepted wisdom, and there’s a tendency to forget that technologists have been saying “coming soon” for decades now.

Alaska became the first state to make vaccinations available to all adults over the age of 16 earlier this month, followed by Mississippi. Several others have since followed suit, including Arizona, Utah, Indiana, Georgia and West Virginia.

Other states are moving to make more groups eligible ahead of schedule, based on age or underlying conditions.

According to a map released by the White House COVID-19 Response Team on Friday, four states have yet to confirm plans to expand eligibility ahead of the May 1 deadline: New York, Wyoming, Arkansas and South Carolina, where officials have said they are not on track to hit that threshold until May 3.

Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention, said at the briefing that the country has seen an uptick in case counts and hospital admissions, with the most recent 7-day averages showing about 57,000 cases and 4,700 hospitalizations per day, and hospitalizations hovering around 1,000.

The U.S. is administering 2.5 million shots a day at its current pace, Zients said, adding that vaccine makers are "setting and hitting targets." Some 27 million doses went to states, tribes and territories this week.

Johnson & Johnson has accelerated production of its single-shot vaccine and is on track to deliver 11 million doses next week.

“Now that the audit of Maricopa is wrapping up, we need to Audit Pima County – the 2nd largest county in AZ,” Mark Finchem, a member of the state legislature and the Trump-endorsed candidate for Arizona secretary of state tweeted. He urged readers to sign his “petition” for a Pima County audit — one that would give his campaign their personal information.

A state representative from Florida used the report to call for audits in every state in the country. 

The photo was taken by Jennifer Foster, a civilian communications director for the Pinal County Sheriff’s Office in Arizona. She said the moment resonated for personal reasons: She remembered as a young girl seeing her father, a 32-year veteran of the Phoenix police force, buy food for a homeless man. “He squatted down, just like this officer,” she said.

But there was also seriousness. Mary Robinson, 60, from a rural part of Northern Arizona, said she felt energized by the march, but the work ahead seemed hard.

“They are in rural America where there’s no jobs, no technology, and many people live on government subsidies. It’s not that they are ignorant or stupid, they are just uninformed.”

Who fits the stereotype of the rich and powerful described in this research? Mitt Romney. Empathy: “I’m not concerned about the very poor.” Compassion: “I like being able to fire people who provide services to me.” Sympathy for the disadvantaged: My wife “drives a couple of Cadillacs.” Willingness to lie in negotiations: “I was a severely conservative Republican governor.”

48 percent described the Democratic Party as “weak,” compared to 28 percent who described the Republican Party that way. Conversely, 50 percent said the Republican Party is “cold hearted,” compared to 30 percent who said that was true of the Democrats.

This is the war that is raging throughout America. It is between conservatives, who emphasize personal responsibility and achievement, against liberals, who say the government must take from the wealthy and give to the poor. So it will be interesting this week to see if President Obama can rally the country to support his vision of a strong social compact. He has compassion on his side. Few Americans want to see their fellow citizens suffer. But the president does have that fiscal responsibility issue haunting him because the country remains in dire trouble.

For power holders, the world is viewed through an instrumental lens, and approach is directed toward those individuals who populate the useful parts of the landscape. Our results suggest that power not only channels its possessor’s energy toward goal completion but also targets and attempts to harness the energy of useful others. Thus, power appears to be a great facilitator of goal pursuit through a combination of intrapersonal and interpersonal processes. The nature of the power holder’s goals and interpersonal relationships ultimately determine how power is harnessed and what is accomplished in the end.

Republicans recognize the political usefulness of objectification, capitalizing on “compassion fatigue,” or the exhaustion of empathy, among large swathes of the electorate who are already stressed by the economic collapse of 2008, high levels of unemployment, an epidemic of foreclosures, stagnant wages and a hyper-competitive business arena.

. Republican debates provided further evidence of compassion fatigue when audiences cheered the record-setting use of the death penalty in Texas and applauded the prospect of a gravely ill pauper who, unable to pay medical fees, was allowed to die.Even Rick Santorum, who has been described by the National Review as holding “unstinting devotion to human dignity” and as fluent in “the struggles of the working class,” wants to slash aid to the poor. At a Feb. 21 gathering of 500 voters in Maricopa County, Ariz., Santorum brought the audience to its feet as he declared:We need to take everything from food stamps to Medicaid to the housing programs to education and training programs, we need to cut them, cap them, freeze them, send them to the states, say that there has to be a time limit and a work requirement, and be able to give them the flexibility to do those programs here at the state level.

President Obama has a substantial advantage this year because he does not have a primary challenger, which frees him from the need to emphasize his advocacy for the disempowered — increasing benefits or raising wages for the poor. This allows him to pick and chose the issues he wants to address.At the same time, compassion fatigue may make it easier for the Republican nominee to overcome the liabilities stemming from his own primary rhetoric, to reach beyond the core of the party to white centrist voters less openly drawn to hard-edged conservatism. With their capacity for empathy frayed by a pervasive sense of diminishing opportunity and encroaching shortfall, will these voters once again become dependable Republicans in 2012?

“It’s just a curious bias of the media around here. It’s wonderful. One person says something negative and the media rushes and covers that. The wonderful balanced media that I love in this community.”

Santorum had reason to be peeved. He was running against the Democrat Bob Casey. He was trailing by double digits and knew he was going to lose. He was not a happy camper, but then he rarely is.

As he has shown in the Republican debates, Santorum can be equable. The anger usually flares on matters closest to his heart: faith, family and morals. And if, by chance, you get him started on the role of religion in American life, get ready for a Vesuvius moment.

Outside of these areas, he was more pragmatic. Then and now, Santorum held predictably conservative views, but he was astute enough to bend on some issues and be — as he put it in the Arizona debate — “a team player.”

In the Senate, he represented a state with a relentlessly moderate-to-centrist electorate so when campaigning he emphasized the good deeds he did in Washington. Editorial board meetings with Santorum usually began with him listing federal money he had brought in for local projects.People who don’t know him — and just see the angry Rick — don’t realize what a clever politician Santorum is. He didn’t rise to become a Washington insider through the power of prayer. He may say the Rosary, but he knows his Machiavelli.

That said, Santorum’s anger is not an act.  It is genuine. It has its roots in the fact that he had the misfortune to be born in the second half of the 20th century. In his view, it was an era when moral relativism and anti-religious feeling held sway, where traditional values were ignored or mocked, where heretics ruled civic and political life. If anything, it’s gotten worse in the 21st, with the election of Barack Obama.Leave it to Santorum to attack Obama on his theology, of all things. He sees the president as an exemplar of mushy, feel-good Christianity that emphasizes tolerance over rectitude, and the love of Jesus over the wrath of God.

Like many American Catholics, I struggle with the church’s teachings as they apply to the modern world. Santorum does not.

I once wrote that Santorum has one of the finest minds of the 13th century. It was meant to elicit a laugh, but there’s truth behind the remark. No Vatican II for Santorum. His belief system is the fixed and firm Catholicism of the Council of Trent in the mid-16th century. And Santorum is a warrior for those beliefs.

During the campaign, he has regularly criticized the media for harping on his public statements on homosexuality, contraception, abortion, the decline in American morals. Still, he can’t resist talking about them. These are the issues that get his juices flowing, not the deficit or federal energy policy.

Santorum went to Houston not to praise Kennedy but to bash him. To Santorum, the Kennedy speech did permanent damage because it led to secularization of American politics. He said it laid the foundation for attacks on religion by the secular left that has led to denial of free speech rights to religious people. “John F. Kennedy chose not to just dispel fear,” Santorum said, “he chose to expel faith.”

Ultimately Kennedy’s attempt to reassure Protestants that the Catholic Church would not control the government and suborn its independence advanced a philosophy of strict separation that would create a purely secular public square cleansed of all religious wisdom and the voice of religious people of all faiths. He laid the foundation for attacks on religious freedom and freedom of speech by the secular left and its political arms like the A.C.L.U and the People for the American Way. This has and will continue to create dissension and division in this country as people of faith increasingly feel like second-class citizens.One consequence of Kennedy’s speech, Santorum said,is the debasement of our First Amendment right of religious freedom. Of all the great and necessary freedoms listed in the First Amendment, freedom to exercise religion (not just to believe, but to live out that belief) is the most important; before freedom of speech, before freedom of the press, before freedom of assembly, before freedom to petition the government for redress of grievances, before all others. This freedom of religion, freedom of conscience, is the trunk from which all other branches of freedom on our great tree of liberty get their life.As so it went for 5,000 words. It is a revelatory critique of the modern world and Santorum quoted G.K. Chesterton, Edmund Burke, St. Thomas Aquinas and Martin Luther King to give heft to his assertions.That said, it was an angry speech, conjuring up images of people of faith cowering before leftist thought police. Who could rescue us from this predicament? Who could banish the secularists and restore religious morality to its throne?

Romney had sketched out an economic plan that avoided the supply-side gimmicks and outright crankery embraced by many of his rivals. He had backed the smartest conservative thinking on entitlements and was rewarded with bipartisan cover when Oregon Democratic Senator Ron Wyden endorsed a similar model for Medicare reform.

But the frontrunner did lose something in the days leading up to the Michigan vote. He lost his general election narrative.

But then came the South Carolina primary, and Romney’s fumbling, tone-deaf responses to Newt Gingrich’s attacks on his career at Bain Capital. His awkwardness didn’t have direct policy implications, but it revealed a surprising inability to defend his own chosen electoral narrative against fairly obvious attacks. And with the businessman-turnaround artist narrative compromised, it became much easier for Romney’s rivals to turn the focus to his moderate past and long list of flip-flops.

It was to change this dynamic, presumably, that Romney’s campaign decided to have him come out for the first time with a big tax reform plan of his own, which he unveiled last week in a speech at Ford Field. In its broadest strokes, the plan isn’t terrible: It promises lower rates and a broader base, which is the goal of just about every sensible tax reform proposal, and it cuts rates for most taxpayers, not just businesses and the rich. But the Romney campaign has declined to explain exactly how the cuts will be paid for, offering vague promises of loophole closing and spending cuts that suggest a return to supply-side irresponsibility.

If left unrevised and unaddressed, this irresponsibility threatens to demolish the pillars of Romney’s general-election argument. First, it will make it considerably harder for him to attack the White House’s record on deficits, which would otherwise be a central part of the case against the president. Second, it will make Romney’s own vision for entitlement reform easy to demagogue and dismiss, since President Obama will have grounds to argue that his opponent only wants to cut Medicare and Social Security in order to cut taxes on the rich.

Both of these problems, needless to say, will be exacerbated if Romney continues to be unable to talk about his wealth in anything save the most clueless and flatfooted fashion. The White House might prefer to face Rick Santorum in the general election, but an out-of-touch rich guy running on Medicare cuts and an ill-considered tax plan will make for a pretty inviting target in his own right.

Often, preliminary studies fuel irrational exuberance about a promising dietary supplement, leading millions of people to buy in to the trend. Many never stop. They continue even though more rigorous studies — which can take many years to complete — almost never find that vitamins prevent disease, and in some cases cause harm

There’s no conclusive evidence that dietary supplements prevent chronic disease in the average American, Dr. Manson said. And while a handful of vitamin and mineral studies have had positive results, those findings haven’t been strong enough to recommend supplements to the general American public, she said.

The National Institutes of Health has spent more than $2.4 billion since 1999 studying vitamins and minerals. Yet for “all the research we’ve done, we don’t have much to show for it,” said Dr. Barnett Kramer, director of cancer prevention at the National Cancer Institute.

A big part of the problem, Dr. Kramer said, could be that much nutrition research has been based on faulty assumptions, including the notion that people need more vitamins and minerals than a typical diet provides; that megadoses are always safe; and that scientists can boil down the benefits of vegetables like broccoli into a daily pill.

when researchers tried to deliver the key ingredients of a healthy diet in a capsule, Dr. Kramer said, those efforts nearly always failed.

It’s possible that the chemicals in the fruits and vegetables on your plate work together in ways that scientists don’t fully understand — and which can’t be replicated in a table

More important, perhaps, is that most Americans get plenty of the essentials, anyway. Although the Western diet has a lot of problems — too much sodium, sugar, saturated fat and calories, in general — it’s not short on vitamins

Without even realizing it, someone who eats a typical lunch or breakfast “is essentially eating a multivitamin,”

The body naturally regulates the levels of many nutrients, such as vitamin C and many B vitamins, Dr. Kramer said, by excreting what it doesn’t need in urine. He added: “It’s hard to avoid getting the full range of vitamins.”

Not all experts agree. Dr. Walter Willett, a professor at the Harvard T.H. Chan School of Public Health, says it’s reasonable to take a daily multivitamin “for insurance.” Dr. Willett said that clinical trials underestimate supplements’ true benefits because they aren’t long enough, often lasting five to 10 years. It could take decades to notice a lower rate of cancer or heart disease in vitamin taker

For Charlsa Bentley, 67, keeping up with the latest nutrition research can be frustrating. She stopped taking calcium, for example, after studies found it doesn’t protect against bone fractures. Additional studies suggest that calcium supplements increase the risk of kidney stones and heart disease.

People who take vitamins tend to be healthier, wealthier and better educated than those who don’t, Dr. Kramer said. They are probably less likely to succumb to heart disease or cancer, whether they take supplements or not. That can skew research results, making vitamin pills seem more effective than they really are

Because folic acid can lower homocysteine levels, researchers once hoped that folic acid supplements would prevent heart attacks and strokes.In a series of clinical trials, folic acid pills lowered homocysteine levels but had no overall benefit for heart disease, Dr. Lichtenstein said

When studies of large populations showed that people who eat lots of seafood had fewer heart attacks, many assumed that the benefits came from the omega-3 fatty acids in fish oil, Dr. Lichtenstein said.Rigorous studies have failed to show that fish oil supplements prevent heart attacks

But it’s possible the benefits of sardines and salmon have nothing to do with fish oil, Dr. Lichtenstein said. People who have fish for dinner may be healthier as a result of what they don’t eat, such as meatloaf and cheeseburgers.

“Eating fish is probably a good thing, but we haven’t been able to show that taking fish oil [supplements] does anything for you,

In the tiny amounts provided by fruits and vegetables, beta carotene and similar substances appear to protect the body from a process called oxidation, which damages healthy cells, said Dr. Edgar Miller, a professor of medicine at Johns Hopkins School of Medicine.Experts were shocked when two large, well-designed studies in the 1990s found that beta carotene pills actually increased lung cancer rates.

Likewise, a clinical trial published in 2011 found that vitamin E, also an antioxidant, increased the risk of prostate cancer in men by 17 percent

“Vitamins are not inert,” said Dr. Eric Klein, a prostate cancer expert at the Cleveland Clinic who led the vitamin E study. “They are biologically active agents. We have to think of them in the same way as drugs. If you take too high a dose of them, they cause side effects.”

“We should be responsible physicians,” she said, “and wait for the data.”

“Usually by four to six weeks, there’s not much left,” said Deepta Bhattacharya, an immunologist at the University of Arizona. But germinal centers stimulated by the mRNA vaccines are “still going, months into it, and not a lot of decline in most people.”

The broader the range and the longer these cells have to practice, the more likely they are to be able to thwart variants of the virus that may emerge.

“Everyone always focuses on the virus evolving — this is showing that the B cells are doing the same thing,” said Marion Pepper, an immunologist at the University of Washington in Seattle. “And it’s going to be protective against ongoing evolution of the virus, which is really encouraging.”

Dr. Ellebedy’s team found that 15 weeks after the first dose of vaccine, the germinal center was still highly active in all 14 of the participants, and that the number of memory cells that recognized the coronavirus had not declined.

“The fact that the reactions continued for almost four months after vaccination — that’s a very, very good sign,” Dr. Ellebedy said. Germinal centers typically peak one to two weeks after immunization, and then wane.

After an infection or a vaccination, a specialized structure called the germinal center forms in lymph nodes. This structure is an elite school of sorts for B cells — a boot camp where they become increasingly sophisticated and learn to recognize a diverse set of viral genetic sequences.

The results suggest that a vast majority of vaccinated people will be protected over the long term — at least, against the existing coronavirus variants

But older adults, people with weak immune systems and those who take drugs that suppress immunity may need boosters; people who survived Covid-19 and were later immunized may never need them at all.

In the absence of variants that sidestep immunity, in theory immunity could last a lifetime, experts said. But the virus is clearly evolving.

“Anything that would actually require a booster would be variant-based, not based on waning of immunity,” Dr. Bhattacharya said. “I just don’t see that happening.”

The good news: A booster vaccine will probably have the same effect as prior infection in immunized people, Dr. Ellebedy said. “If you give them another chance to engage, they will have a massive response,” he said, referring to memory B cells.

Dr. Ellebedy said the results also suggested that these signs of persistent immune reaction might be caused by mRNA vaccines alone, as opposed to those made by more traditional means, like Johnson & Johnson’s

But that is an unfair comparison, because the Johnson & Johnson vaccine is given as a single dose, Dr. Iwasaki said: “If the J & J had a booster, maybe it will induce this same kind of response.”

they’re a constituency where a less-bigoted-seeming G.O.P. could make substantial inroads, and where even a figure like Trump, if the economy is strong enough and the Democrat seems sufficiently culturally extreme, can at least win enough minority support to keep himself competitive.

Alexa and Her CounterpartsAlexa, Amazon’s intelligent assistant that listens to your voice commands to play music, order diapers and place a phone call, will be everywhere at CES.

Smart CitiesNowadays, it’s easy to shop for high-quality internet-connected home accessories, like light bulbs, thermostats and security cameras. At CES, Samsung is even planning to introduce a smart refrigerator at the electronics show that can listen to voice commands to control other home accessories.

Smarter CarsSelf-driving-car enthusiasts like Elon Musk, the chief executive of Tesla, dream of a future where driverless cars eliminate traffic accidents while letting people do work on their commutes.They can keep dreaming: Autonomous vehicles still have a long way to go before they become safe and properly regulated.

Next-Generation Wireless TechnologyAs a growing number of devices rely on artificial intelligence, they will require faster bandwidth speeds. At CES, wireless companies like AT&T and Verizon are expected to give progress reports on so-called 5G, the fifth-generation network technology.With 5G, wireless carriers envision an era of incredibly fast speeds that let smartphone users download a movie in less than five seconds — roughly 100 times faster than the current network technology, 4G. Even more important, 5G is expected to greatly reduce latency to let devices communicate with each other with extremely fast response times.

The U.S. Press Freedom Tracker said on Tuesday it has counted 211 "press freedom violations" since the start of the George Floyd protests last week, which in some cases have led to riots.

"In every case that we are aware of, there are strong indications that officers knew the journalist was a member of the press," the Reporters Committee for Freedom of the Press stated in a letter to Minnesota authorities on Tuesday.

This was the largest coalition to sign such a letter in the Reporters Committee's 50-year history. "We'll be sending similar letters to other jurisdictions around the country," a spokeswoman said.

Take swift action to discipline any officer who is found to have arrested or assaulted a journalist engaged in newsgathering."

"Inform your officers that they themselves could be subject to legal liability for violating these rights."

"Ensure that crowd control tactics are appropriate and proportional, and are designed to prevent collateral harm to journalists covering the protests.

"Continue to exempt members of the news media from mobility restrictions, including, and especially, curfews."

"Release all information about arrests of or physical interactions with the press to the public to allow it to evaluate the legitimacy of police conduct."

one of the leading modelers, Gabriela Gomes, suggested the entire area of research was being effectively blackballed out of fear it might encourage a relaxation of pandemic vigilance. “This is the very sad reason for the absence of more optimistic projections on the development of this pandemic in the scientific literature,” she wrote on Twitter. “Our analysis suggests that herd-immunity thresholds are being achieved despite strict social-distancing measures.”

Gomes suggested, herd immunity could happen with as little as one quarter of the population of a community exposed — or perhaps just 20 percent. “We just keep running the models, and it keeps coming back at less than 20 percent,” she told Hamblin. “It’s very striking.” Such findings, if they held up, would be very instructive, as Hamblin writes: “It would mean, for instance, that at 25 percent antibody prevalence, New York City could continue its careful reopening without fear of another major surge in cases.”

But for those hoping that 25 percent represents a true ceiling for pandemic spread in a given community, well, it almost certainly does not, considering that recent serological surveys have shown that perhaps 93 percent of the population of Iquitos, Peru, has contracted the disease; as have more than half of those living in Indian slums; and as many as 68 percent in particular neighborhoods of New York City

overshoot of that scale would seem unlikely if the “true” threshold were as low as 20 or 25 percent.

But, of course, that threshold may not be the same in all places, across all populations, and is surely affected, to some degree, by the social behavior taken to protect against the spread of the disease.

we probably err when we conceive of group immunity in simplistically binary terms. While herd immunity is a technical term referring to a particular threshold at which point the disease can no longer spread, some amount of community protection against that spread begins almost as soon as the first people are exposed, with each case reducing the number of unexposed and vulnerable potential cases in the community by one

you would not expect a disease to spread in a purely exponential way until the point of herd immunity, at which time the spread would suddenly stop. Instead, you would expect that growth to slow as more people in the community were exposed to the disease, with most of them emerging relatively quickly with some immune response. Add to that the effects of even modest, commonplace protections — intuitive social distancing, some amount of mask-wearing — and you could expect to get an infection curve that tapers off well shy of 60 percent exposure.

Looking at the data, we see that transmissions in many severely impacted states began to slow down in July, despite limited interventions. This is especially notable in states like Arizona, Florida, and Texas. While we believe that changes in human behavior and changes in policy (such as mask mandates and closing of bars/nightclubs) certainly contributed to the decrease in transmission, it seems unlikely that these were the primary drivers behind the decrease. We believe that many regions obtained a certain degree of temporary herd immunity after reaching 10-35 percent prevalence under the current conditions. We call this 10-35 percent threshold the effective herd immunity threshold.

Indeed, that is more or less what was recently found by Youyang Gu, to date the best modeler of pandemic spread in the U.S

he cautioned again that he did not mean to imply that the natural herd-immunity level was as low as 10 percent, or even 35 percent. Instead, he suggested it was a plateau determined in part by better collective understanding of the disease and what precautions to take

Gu estimates national prevalence as just below 20 percent (i.e., right in the middle of his range of effective herd immunity), it still counts, I think, as encouraging — even if people in hard-hit communities won’t truly breathe a sigh of relief until vaccines arrive.

If you can get real protection starting at 35 percent, it means that even a mediocre vaccine, administered much more haphazardly to a population with some meaningful share of vaccination skeptics, could still achieve community protection pretty quickly. And that is really significant — making both the total lack of national coordination on rollout and the likely “vaccine wars” much less consequential.

At least 20 percent of the public, and perhaps 50 percent, had some preexisting, cross-protective T-cell response to SARS-CoV-2, according to one much-discussed recent paper. An earlier paper had put the figure at between 40 and 60 percent. And a third had found an even higher prevalence: 81 percent.

The T-cell story is similarly encouraging in its big-picture implications without being necessarily paradigm-changing

These numbers suggest their own heterogeneity — that different populations, with different demographics, would likely exhibit different levels of cross-reactive T-cell immune response

The most optimistic interpretation of the data was given to me by Francois Balloux, a somewhat contrarian disease geneticist and the director of the University College of London’s Genetics Institute

According to him, a cross-reactive T-cell response wouldn’t prevent infection, but would probably mean a faster immune response, a shorter period of infection, and a “massively” reduced risk of severe illness — meaning, he guessed, that somewhere between a third and three-quarters of the population carried into the epidemic significant protection against its scariest outcomes

the distribution of this T-cell response could explain at least some, and perhaps quite a lot, of COVID-19’s age skew when it comes to disease severity and mortality, since the young are the most exposed to other coronaviruses, and the protection tapers as you get older and spend less time in environments, like schools, where these viruses spread so promiscuously.

Balloux told me he believed it was also possible that the heterogeneous distribution of T-cell protection also explains some amount of the apparent decline in disease severity over time within countries on different pandemic timelines — a phenomenon that is more conventionally attributed to infection spreading more among the young, better treatment, and more effective protection of the most vulnerable (especially the old).

Going back to Youyang Gu’s analysis, what he calls the “implied infection fatality rate” — essentially an estimated ratio based on his modeling of untested cases — has fallen for the country as a whole from about one percent in March to about 0.8 percent in mid-April, 0.6 percent in May, and down to about 0.25 percent today.

even as we have seemed to reach a second peak of coronavirus deaths, the rate of death from COVID-19 infection has continued to decline — total deaths have gone up, but much less than the number of cases

In other words, at the population level, the lethality of the disease in America has fallen by about three-quarters since its peak. This is, despite everything that is genuinely horrible about the pandemic and the American response to it, rather fantastic.

there may be some possible “mortality displacement,” whereby the most severe cases show up first, in the most susceptible people, leaving behind a relatively protected population whose experience overall would be more mild, and that T-cell response may play a significant role in determining that susceptibility.

That, again, is Balloux’s interpretation — the most expansive assessment of the T-cell data offered to me

The most conservative assessment came from Sarah Fortune, the chair of Harvard’s Department of Immunology

Fortune cautioned not to assume that cross-protection was playing a significant role in determining severity of illness in a given patient. Those with such a T-cell response, she told me, would likely see a faster onset of robust response, yes, but that may or may not yield a shorter period of infection and viral shedding

Most of the scientists, doctors, epidemiologists, and immunologists I spoke to fell between those two poles, suggesting the T-cell cross-immunity findings were significant without necessarily being determinative — that they may help explain some of the shape of pandemic spread through particular populations, but only some of the dynamics of that spread.

he told me he believed, in the absence of that data, that T-cell cross-immunity from exposure to previous coronaviruses “might explain different disease severity in different people,” and “could certainly be part of the explanation for the age skew, especially for why the very young fare so well.”

the headline finding was quite clear and explicitly stated: that preexisting T-cell response came primarily via the variety of T-cells called CD4 T-cells, and that this dynamic was consistent with the hypothesis that the mechanism was inherited from previous exposure to a few different “common cold” coronaviruses

“This potential preexisting cross-reactive T-cell immunity to SARS-CoV-2 has broad implications,” the authors wrote, “as it could explain aspects of differential COVID-19 clinical outcomes, influence epidemiological models of herd immunity, or affect the performance of COVID-19 candidate vaccines.”

“This is at present highly speculative,” they cautioned.

The case has caused palpable unease at the Fox News Channel, said several people there,

Dominion is trying to build a case that aims straight at the top of the Fox media empire and the Murdochs. In court filings and depositions, Dominion lawyers have laid out how they plan to show that senior Fox executives hatched a plan after the election to lure back viewers who had switched to rival hard-right networks, which were initially more sympathetic than Fox was to Mr. Trump’s voter-fraud claims.

Libel law doesn’t protect lies. But it does leave room for the media to cover newsworthy figures who tell them. And Fox is arguing, in part, that’s what shields it from liability.

“The harm to Dominion from the lies told by Fox is unprecedented and irreparable because of how fervently millions of people believed them — and continue to believe them,”

For Dominion to convince a jury that Fox should be held liable for defamation and pay damages, it has to clear an extremely high legal bar known as the “actual malice” standard. Dominion must show either that people inside Fox knew what hosts and guests were saying about the election technology company was false, or that they effectively ignored information proving that the statements in question were wrong — which is known in legal terms as displaying a reckless disregard for the truth.

Dominion’s lawyers have focused some of their questioning in depositions on the decision-making hierarchy at Fox News, according to one person with direct knowledge of the case, showing a particular interest in what happened on election night inside the network in the hours after it projected Mr. Trump would lose Arizona.

Fox has also been searching for evidence that could, in effect, prove the Dominion conspiracy theories weren’t really conspiracy theories. Behind the scenes, Fox’s lawyers have pursued documents that would support numerous unfounded claims about Dominion, including its supposed connections to Hugo Chávez, the Venezuelan dictator who died in 2013, and software features that were ostensibly designed to make vote manipulation easier.

In one interview, Mr. Giuliani falsely claimed that Dominion was owned by a Venezuelan company with close ties to Mr. Chavez, and that it was formed “to fix elections.” (Dominion was founded in Canada in 2002 by a man who wanted to make it easier for blind people to vote.)

A spokesman for Dominion declined to comment. In its initial complaint, the company’s lawyers wrote that “The truth matters,” adding, “Lies have consequences.”

he hurdle Dominion must clear is whether it can persuade a jury to believe that people at Fox knew they were spreading lies.“Disseminating ‘The Big Lie’ isn’t enough,” said RonNell Andersen Jones, a law professor and First Amendment scholar at the University of Utah’s S.J. Quinney College of Law. “It has to be a knowing lie.”