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Nepali officials on Monday said the cause of the crash was not immediately clear. The most likely possibility, they said, was that the plane crashed into a mountain after it lost contact with air traffic controllers while navigating in particularly bad weather.

To reach remote mountainous places like Jomsom, residents and visitors rely on small twin-engine planes. The route from Pokhara to Jomsom is considered one of the riskiest in Nepal because planes have to fly through narrow valleys, where visibility is often a challenge. Crashes are more common than usual because of frequent bad weather, rocky terrain and aging plane fleets.

“Planes just don’t blow up in mid air,” said Richard Aboulafia, vice president for analysis at Teal Group, an aviation consulting firm. “It doesn’t work like that.”

Iranian news organizations tied to the government referred to technical problems with the plane, but they did not elaborate or cite evidence.

After the crash, Ukraine’s embassy in Iran initially issued a statement ruling out terrorism or a rocket attack as a cause of the crash. But the statement was later removed from the embassy’s website and replaced by one saying it was too early to draw any conclusions.

An airliner should be able to fly even if one engine fails. An “uncontained” engine failure, in which parts of the engine disintegrate, can spray shrapnel that damages and even destroys the plane, but such events are rare.

After an accident, the “black boxes” are often sent to the plane’s maker for analysis, but Iran would not send the flight data recorders to Boeing, an American company, Mr. Abedzadeh said in an interview with Mehr. “We will not give the black box to the manufacturer and the Americans,” Mehr quoted him as saying.

President Volodymyr Zelensky of Ukraine said he had ordered the prosecutor general to open a criminal investigation into the crash and that the country’s entire civil aviation fleet would be checked.

On Tuesday, the Federal Aviation Administration barred American airliners from flying over Iran, citing a risk that commercial planes would be mistaken for military aircraft. Several non-American carriers rerouted flights on Wednesday to avoid Iraq and Iran, according to Flightradar24.

The airline said it was canceling flights to Tehran indefinitely and promised a full investigation into the causes of the crash, involving officials from Ukraine, Iran and Boeing.

The airline began in the 1990s as newly independent Ukraine’s state flag carrier but was subsequently privatized. Its website calls the business a “public private entity.”

Russia denied its aircraft performed any dangerous maneuvers as it intercepted the U.S. plane.

This sermon was an effort from Iran's supreme leader - who has come under heavy criticism in recent days - to defend his rule.He delivered part of his address in Arabic, calling on the Arab and Islamic world to drive the US out of the region. "The biggest punishment for the United States is its expulsion," he said. But his more immediate aim was to shore up his government after the Ukrainian passenger plane was shot down. The episode has weakened Ayatollah Khamenei's position at home. There have been protests up and down the country, with demonstrators shouting slogans and calling on him to step down.

Explosives experts said it was feasible the device shown in the photo could bring down a plane, depending on where it was located and the density of explosives in the soft drink can. The most vulnerable locations include the fuel line, the cockpit or anywhere close to the fuselage skin.

Experts added that the photo could also provide a key clue in tracking Islamic State as the detonator pictured was a commercial one, which could be traced back to its manufacturer.

State Department spokesman John Kirby said on Wednesday the U.S. government was not in a position to confirm "the veracity" of the magazine's claim.

activity is likely the reason," he said, referring to the crash.

"We do believe that terrorist

also published a photo of what it said were passports belonging to dead Russians "obtained by the mujahideen". It was not immediately possible to verify the authenticity of the published photos.The group, which has seized large swathes of Syria and Iraq, said it had exploited a loophole at Sharm al-Sheikh airport, where the plane originated, in order to smuggle a bomb on board.

The airport is widely used by budget and charter airlines to fly tourists to the nearby resorts on the Sinai coast.

said it had initially planned to bring down a plane belonging to a country participating in the U.S.-led coalition bombing it in Syria and Iraq, but it changed course after Moscow started its own air strikes campaign in Syria.

Islamic State's Egyptian branch, Sinai Province, claimed responsibility for the attack the day it happened but Egyptian officials were quick to dismiss talk of a bomb as premature.

Last month, the federal security service’s director, Alexander Bortnikov, said an improvised bomb with the force of up to 1kg of TNT blew up onboard the plane, and traces of explosives had been found in the plane debris.

The country’s tourism industry has been badly hit over the years by the fallout from terror attacks. Holiday flights from Russia and Britain to its top winter sun resort will not resume until 2016, leaving it virtually empty for what should be peak season, and overall tourist revenues are expected to fall by at least 10% this year.

The first refugees arrive following promises from Trudeau’s Liberal party to take in 25,000 refugees in all ten of Canada’s provinces. A second military aircraft is due to land on Saturday, according to the Star, as part of the government’s plan to accept 10,000 refugees before the end of 2015 and 15,000 more in the first two months of 2016. [The Toronto Star]

William Lara, also known as Joe Lara, played Tarzan in the movie “Tarzan in Manhattan” and in the television series “Tarzan: The Epic Adventures,” according to the website IMDb.

In a statement posted on Sunday on the church’s website, the congregation said it appreciated prayers for the seven fellowship leaders who were lost in the crash.

At a news conference on Saturday night, Capt. Joshua Sanders of Rutherford County Fire Rescue said that after searching the lake since 11 a.m., “we have transitioned from a rescue effort to a recovery effort.”

The crews at the scene were “no longer looking for live victims at this point,” Captain Sanders said. “We are now recovering as much as we can from the crash site.”

He said the downing of the Russian plane would hamper efforts to form a united front against the terrorist group ISIS.

In March of 2014, Turkey shot down a Syrian fighter jet after the warplane strayed into its airspace, according to then-Prime Minister Recep Tayyip Erdogan.

In a famous journal he kept from 1935 to 1944, the Romanian writer Mihail Sebastian chronicled an even more extreme shift in his own country. Like me, Sebastian was Jewish; like me, most of his friends were on the political right. In his journal, he described how, one by one, they were drawn to fascist ideology, like a flock of moths to an inescapable flame. He recounted the arrogance and confidence they acquired as they moved away from identifying themselves as Europeans—admirers of Proust, travelers to Paris—and instead began to call themselves blood-and-soil Romanians. He listened as they veered into conspiratorial thinking or became casually cruel. People he had known for years insulted him to his face and then acted as if nothing had happened. “Is friendship possible,” he wondered in 1937, “with people who have in common a whole series of alien ideas and feelings—so alien that I have only to walk in the door and they suddenly fall silent in shame and embarrassment?”

This is not 1937. Nevertheless, a parallel transformation is taking place in my own time, in the Europe that I inhabit and in Poland, a country whose citizenship I have acquired

the Dreyfus affair is most interesting because it was sparked by a single cause célèbre. Just one court case—one disputed trial—plunged an entire country into an angry debate, creating unresolvable divisions between people who had previously not known that they disagreed with one another. But this shows that vastly different understandings of what is meant by “France” were already there, waiting to be discovered

More important, though the people I am writing about here, the nativist ideologues, are perhaps not all as successful as they would like to be (about which more in a minute), they are not poor and rural, they are not in any sense victims of the political transition, and they are not an impoverished underclass. On the contrary, they are educated, they speak foreign languages, and they travel abroad—just like Sebastian’s friends in the 1930s.

What has caused this transformation

My answer is a complicated one, because I think the explanation is universal. Given the right conditions, any society can turn against democracy. Indeed, if history is anything to go by, all societies eventually will.

And it is taking place without the excuse of an economic crisis of the kind Europe suffered in the 1930s. Poland’s economy has been the most consistently successful in Europe over the past quarter century. Even after the global financial collapse in 2008, the country saw no recession. What’s more, the refugee wave that has hit other European countries has not been felt here at all. There are no migrant camps, and there is no Islamist terrorism, or terrorism of any kind.

in modern Britain, America, Germany, France, and until recently Poland, we have assumed that competition is the most just and efficient way to distribute power. The best-run businesses should make the most money. The most appealing and competent politicians should rule. The contests between them should take place on an even playing field, to ensure a fair outcome.

All of these debates, whether in 1890s France or 1990s Poland, have at their core a series of important questions: Who gets to define a nation? And who, therefore, gets to rule a nation? For a long time, we have imagined that these questions were settled—but why should they ever be?

the illiberal one-party state, now found all over the world—think of China, Venezuela, Zimbabwe—was first developed by Lenin, in Russia, starting in 1917. In the political-science textbooks of the future, the Soviet Union’s founder will surely be remembered not for his Marxist beliefs, but as the inventor of this enduring form of political organization.

Unlike Marxism, the Leninist one-party state is not a philosophy. It is a mechanism for holding power. It works because it clearly defines who gets to be the elite—the political elite, the cultural elite, the financial elite.

In monarchies such as prerevolutionary France and Russia, the right to rule was granted to the aristocracy, which defined itself by rigid codes of breeding and etiquette. In modern Western democracies, the right to rule is granted, at least in theory, by different forms of competition: campaigning and voting, meritocratic tests that determine access to higher education and the civil service, free markets

Two decades ago, different understandings of “Poland” must already have been present too, just waiting to be exacerbated by chance, circumstance, and personal ambition

Lenin’s one-party state was based on different values. It overthrew the aristocratic order. But it did not put a competitive model in place. The Bolshevik one-party state was not merely undemocratic; it was also anticompetitive and antimeritocratic. Places in universities, civil-service jobs, and roles in government and industry did not go to the most industrious or the most capable. Instead, they went to the most loyal.

As Hannah Arendt wrote back in the 1940s, the worst kind of one-party state “invariably replaces all first-rate talents, regardless of their sympathies, with those crackpots and fools whose lack of intelligence and creativity is still the best guarantee of their loyalty.”

Lenin’s one-party system also reflected his disdain for the idea of a neutral state, of apolitical civil servants and an objective media. He wrote that freedom of the press “is a deception.” He mocked freedom of assembly as a “hollow phrase.” As for parliamentary democracy itself, that was no more than “a machine for the suppression of the working class.”

These parties tolerate the existence of political opponents. But they use every means possible, legal and illegal, to reduce their opponents’ ability to function and to curtail competition in politics and economics. They dislike foreign investment and criticize privatization, unless it is designed to benefit their supporters. They undermine meritocracy. Like Donald Trump, they mock the notions of neutrality and professionalism, whether in journalists or civil servants. They discourage businesses from advertising in “opposition”—by which they mean illegitimate—media.

nepotism, state capture. But if you so choose, you can also describe it in positive terms: It represents the end of the hateful notions of meritocracy and competition, principles that, by definition, never benefited the less successful. A rigged and uncompetitive system sounds bad if you want to live in a society run by the talented. But if that isn’t your primary interest, then what’s wrong with it?

If you are someone who believes that you deserve to rule, then your motivation to attack the elite, pack the courts, and warp the press to achieve your ambitions is strong. Resentment, envy, and above all the belief that the “system” is unfair—these are important sentiments among the intellectuals of the Polish right.

Whatever mistakes the party might make, whatever laws it might break, at least the “truth” about Smolensk would finally be told.

the polarizing political movements of 21st-century Europe demand much less of their adherents. They don’t require belief in a full-blown ideology, and thus they don’t require violence or terror police. They don’t force people to believe that black is white, war is peace, and state farms have achieved 1,000 percent of their planned production. Most of them don’t deploy propaganda that conflicts with everyday reality.

yet all of them depend, if not on a Big Lie, then on what the historian Timothy Snyder once told me should be called the Medium-Size Lie, or perhaps a clutch of Medium-Size Lies. To put it differently, all of them encourage their followers to engage, at least part of the time, with an alternative reality. Sometimes that alternative reality has developed organically; more often, it’s been carefully formulated, with the help of modern marketing techniques, audience segmentation, and social-media campaigns.

In Hungary, the lie is unoriginal: It is the belief, shared by the Russian government and the American alt-right, in the superhuman powers of George Soros, the Hungarian Jewish billionaire who is supposedly plotting to bring down the nation through the deliberate importation of migrants, even though no such migrants exist in Hungary.

In Poland, at least the lie is sui generis. It is the Smolensk conspiracy theory: the belief that a nefarious plot brought down the president’s plane in April 2010.

The truth, as it began to emerge, was not comforting to the Law and Justice Party or to its leader, the dead president’s twin brother. The plane had taken off late; the president was likely in a hurry to land, because he wanted to use the trip to launch his reelection campaign. There was thick fog in Smolensk, which did not have a real airport, just a landing strip in the forest; the pilots considered diverting the plane, which would have meant a drive of several hours to the ceremony. After the president had a brief phone call with his brother, his advisers apparently pressed the pilots to land. Some of them, against protocol, walked in and out of the cockpit during the flight. Also against protocol, the chief of the air force came and sat beside the pilots. “Zmieścisz się śmiało”—“You’ll make it, be bold,” he said. Seconds later, the plane collided with the tops of some birch trees, rolled over, and hit the ground.

When, some weeks after the election, European institutions and human-rights groups began responding to the actions of the Law and Justice government, they focused on the undermining of the courts and public media. They didn’t focus on the institutionalization of the Smolensk conspiracy theory, which was, frankly, just too weird for outsiders to understand. And yet the decision to put a fantasy at the heart of government policy really was the source of the authoritarian actions that followed.

Although the Macierewicz commission has never produced a credible alternate explanation for the crash, the Smolensk lie laid the moral groundwork for other lies. Those who could accept this elaborate theory, with no evidence whatsoever, could accept anything.

picking apart personal and political motives is extremely difficult. That’s what I learned from the story of Jacek Kurski, the director of Polish state television and the chief ideologist of the Polish illiberal state. He started out in the same place, at the same time, as his brother, Jarosław Kurski, who edits the largest and most influential liberal Polish newspaper. They are two sides of the same coin.

The Smolensk conspiracy theory, like the Hungarian migration conspiracy theory, served another purpose: For a younger generation that no longer remembered Communism, and a society where former Communists had largely disappeared from politics, it offered a new reason to distrust the politicians, businesspeople, and intellectuals who had emerged from the struggles of the 1990s and now led the country.

More to the point, it offered a means of defining a new and better elite. There was no need for competition, or for exams, or for a résumé bristling with achievements. Anyone who professes belief in the Smolensk lie is by definition a true patriot—and, incidentally, might well qualify for a government job.

Hungary’s belated reckoning with its Communist past—putting up museums, holding memorial services, naming perpetrators—did not, as I thought it would, help cement respect for the rule of law, for restraints on the state, for pluralism

16 years after the Terror Háza’s opening, Hungary’s ruling party respects no restraints of any kind. It has gone much further than Law and Justice in politicizing the state media and destroying the private media, achieving the latter by issuing threats and blocking access to advertising. It has created a new business elite that is loyal to Orbán.

Schmidt embodies what the Bulgarian writer Ivan Krastev recently described as the desire of many eastern and central Europeans to “shake off the colonial dependency implicit in the very project of Westernization,” to rid themselves of the humiliation of having been imitators, followers of the West rather than founders.

Listening to her, I became convinced that there was never a moment when Schmidt’s views “changed.” She never turned against liberal democracy, because she never believed in it, or at least she never thought it was all that important. For her, the antidote to Communism is not democracy but an anti-Dreyfusard vision of national sovereignty

It’s clear that the Medium-Size Lie is working for Orbán—just as it has for Donald Trump—if only because it focuses the world’s attention on his rhetoric rather than his actions.

I described my 1999 New Year’s Eve party to a Greek political scientist. Quietly, he laughed at me. Or rather, he laughed with me; he didn’t mean to be rude. But this thing I was calling polarization was nothing new. “The post-1989 liberal moment—this was the exception,” Stathis Kalyvas told me. Polarization is normal. More to the point, I would add, skepticism about liberal democracy is also normal. And the appeal of authoritarianism is eternal.

Americans, with our powerful founding story, our unusual reverence for our Constitution, our relative geographic isolation, and our two centuries of economic success, have long been convinced that liberal democracy, once achieved, cannot be altered. American history is told as a tale of progress, always forward and upward, with the Civil War as a kind of blip in the middle, an obstacle that was overcome.

In Greece, history feels not linear but circular. There is liberal democracy and then there is oligarchy. Then there is liberal democracy again. Then there is foreign subversion, then there is an attempted Communist coup, then there is civil war, and then there is dictatorship. And so on, since the time of the Athenian republic.

In truth, the argument about who gets to rule is never over, particularly in an era when people have rejected aristocracy, and no longer believe that leadership is inherited at birth or that the ruling class is endorsed by God

Democracy and free markets can produce unsatisfying outcomes, after all, especially when badly regulated, or when nobody trusts the regulators, or when people are entering the contest from very different starting points. Sooner or later, the losers of the competition were always going to challenge the value of the competition itself.

More to the point, the principles of competition, even when they encourage talent and create upward mobility, don’t necessarily answer deeper questions about national identity, or satisfy the human desire to belong to a moral community.

The authoritarian state, or even the semi-authoritarian state—the one-party state, the illiberal state—offers that promise: that the nation will be ruled by the best people, the deserving people, the members of the party, the believers in the Medium-Size Lie.

Sunday's disaster ends a 440-day streak without a commercial passenger jet fatality -- the longest stretch in modern aviation history.

The deal is United’s latest attempt to position itself as a risk taker shaking up an industry that is just getting back on its feet after a devastating pandemic. The airline announced a $20 million investment in an electric air taxi start-up, Archer, in February, and it is working on a “steady drumbeat” of more such bets, said Michael Leskinen, who heads corporate development at United.

What is not clear is whether Boom has solved the problems that forced British Airways and Air France to stop using the Concorde on trans-Atlantic flights — high costs, safety concerns and flagging demand.

Boom, which is working with Rolls-Royce, the British jet engine maker, said its plane would be more efficient than the Concorde; United estimates it will be 75 percent more efficient.

Mr. Scholl said the engines on Boom’s planes would rely entirely on sustainable aviation fuel, which can be made from waste, plants and other organic matter. Experts say such fuel could reduce emissions, but its supply is limited, it is expensive and its use does not eliminate greenhouse gas emissions.

But corporate and international travel is expected to rebound slowly from the pandemic, and some experts say it might not recover fully for years because companies have realized that they can be effective without as many in-person meetings.

Ayatollah Khamenei, 80, addressed the nation from the Mosalla mosque in the capital. The last time he did so was in 2012 on the 33rd anniversary of the country's Islamic Revolution.

He delivered part of his address in Arabic, calling on the Arab and Islamic world to drive the US out of the region. "The biggest punishment for the United States is its expulsion," he said.

Speaking on behalf of the group, he said on Thursday: "We are here to pursue closure, accountability, transparency and justice for the victims - Ukrainian, Swedish, Afghan, British, Canadian as well as Iranian, through a full, complete and transparent international investigation."

They had agreed upon the plan of attack. Sasseville would head for the 757’s cockpit and Penney would aim for the plane's tail. As they sped out beyond Andrews Air Force Base, flying low at about 3,000 feet, they could see black, billowing smoke streaming from the Pentagon.

As she powered up the engines, she shouted to the ground crew to pull the chock blocks holding the wheels.

Pentagon was hit by hijacked American Airlines Flight 77. Reports circulated that a fourth plane, United Flight 93 out of Newark, New Jersey, was out there. Air command speculated it was also headed to D.C. for another strike on the Pentagon, or a strike on the White House or the Capitol building.

Beyond the mission at hand, there wasn’t much else on First Lieutenant Heather Penney’s mind. She had accepted the fate of Flight 93’s passengers, believing whether she succeeded or not, they were going to die. She briefly toyed with the idea of ejecting from her plane just before impact, but quickly dismissed the idea, knowing she had only one shot and didn’t want to miss. It didn’t even cross her mind that there was a possibility the pilot of United Flight 93 was her father, who often flew out of East Coast cities. As it turned out, he wasn’t.

Now the mission changed from intercept to sanitizing the airspace. Not every aircraft aloft that morning was aware the FAA had ordered a national ban on takeoffs of all civilian aircraft regardless of destination. With the assistance of civilian air traffic controllers, Penney and Sasseville began to divert any aircraft away from the D.C. area and ordered them to land as soon as they could. They also identified the first-responding aircraft assisting the rescue at the Pentagon.

Penney and other pilots were instructed to guard the President of the United States as he flew home

In the evening hours, it was time to bring the president home. Penney's plane and the others patrolling the skies around Washington, D.C. had been equipped with live ammunition. They were also given “free-fire” authority, meaning pilots could make the decision to fire on any civilian aircraft deemed to be a threat, instead of waiting for authorization. Several hours after the initial attack, it was still unclear whether more attacks were pending.

"I made a decision with my life and I swore an oath to protect and defend, but these were just average, everyday people, mothers, fathers, school teachers, businessmen," Penney told HISTORY. "They're true heroes."

China Eastern, one of China’s four major airlines, and its subsidiaries have grounded all of their 737-800 aircraft, a total of 223 planes. The carrier said the grounding was a precaution, not a sign there was anything wrong.

An aperiodic tiling displays no such “translational symmetry,” and mathematicians have long sought a single shape that could tile the plane in such a fashion. This is known as the einstein problem.

“I’m always messing about and experimenting with shapes,” said Mr. Smith, 64, who worked as a printing technician, among other jobs, and retired early. Although he enjoyed math in high school, he didn’t excel at it, he said. But he has long been “obsessively intrigued” by the einstein problem.

now a new paper — by Mr. Smith and three co-authors with mathematical and computational expertise — proves Mr. Smith’s discovery true. The researchers called their einstein “the hat,

“The most significant aspect for me is that the tiling does not clearly fall into any of the familiar classes of structures that we understand.”

black and white squares also can make weird nonperiodic patterns, in addition to the familiar, periodic checkerboard pattern. “It’s really pretty trivial to be able to make weird and interesting patterns,” he said. The magic of the two Penrose tiles is that they make only nonperiodic patterns — that’s all they can do.“But then the Holy Grail was, could you do with one — one tile?” Dr. Goodman-Strauss said.

Sir Roger found the proofs “very complicated.” Nonetheless, he was “extremely intrigued” by the einstein, he said: “It’s a really good shape, strikingly simple.”

The simplicity came honestly. Mr. Smith’s investigations were mostly by hand; one of his co-authors described him as an “imaginative tinkerer.”

When in November he found a tile that seemed to fill the plane without a repeating pattern, he emailed Craig Kaplan, a co-author and a computer scientist at the University of Waterloo.

“It was clear that something unusual was happening with this shape,” Dr. Kaplan said. Taking a computational approach that built on previous research, his algorithm generated larger and larger swaths of hat tiles. “There didn’t seem to be any limit to how large a blob of tiles the software could construct,”

The first step, Dr. Kaplan said, was to “define a set of four ‘metatiles,’ simple shapes that stand in for small groupings of one, two, or four hats.” The metatiles assemble into four larger shapes that behave similarly. This assembly, from metatiles to supertiles to supersupertiles, ad infinitum, covered “larger and larger mathematical ‘floors’ with copies of the hat,” Dr. Kaplan said. “We then show that this sort of hierarchical assembly is essentially the only way to tile the plane with hats, which turns out to be enough to show that it can never tile periodically.”

some might wonder whether this is a two-tile, not one-tile, set of aperiodic monotiles.

Dr. Goodman-Strauss had raised this subtlety on a tiling listserv: “Is there one hat or two?” The consensus was that a monotile counts as such even using its reflection. That leaves an open question, Dr. Berger said: Is there an einstein that will do the job without reflection?

“the hat” was not a new geometric invention. It is a polykite — it consists of eight kites. (Take a hexagon and draw three lines, connecting the center of each side to the center of its opposite side; the six shapes that result are kites.)

“It’s likely that others have contemplated this hat shape in the past, just not in a context where they proceeded to investigate its tiling properties,” Dr. Kaplan said. “I like to think that it was hiding in plain sight.”

Incredibly, Mr. Smith later found a second einstein. He called it “the turtle” — a polykite made of not eight kites but 10. It was “uncanny,” Dr. Kaplan said. He recalled feeling panicked; he was already “neck deep in the hat.”

Dr. Myers, who had done similar computations, promptly discovered a profound connection between the hat and the turtle. And he discerned that, in fact, there was an entire family of related einsteins — a continuous, uncountable infinity of shapes that morph one to the next.

this einstein family motivated the second proof, which offers a new tool for proving aperiodicity. The math seemed “too good to be true,” Dr. Myers said in an email. “I wasn’t expecting such a different approach to proving aperiodicity — but everything seemed to hold together as I wrote up the details.”

Mr. Smith was amazed to see the research paper come together. “I was no help, to be honest.” He appreciated the illustrations, he said: “I’m more of a pictures person.”