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The Higgs boson was the last missing piece of the Standard Model, which explains all we know about subatomic particles and forces. But there are questions this model does not answer, such as what happens at the bottom of a black hole, the identity of the dark matter and dark energy that rule the cosmos, or why the universe is matter and not antimatter.

When physicists announced in 2012 that they had indeed discovered the Higgs boson, it was not the end of physics. It was not even, to paraphrase Winston Churchill, the beginning of the end.

A coincidence is the most probable explanation for the surprising bumps in data from the collider, physicists from the experiments cautioned, saying that a lot more data was needed and would in fact soon be available

The Large Hadron Collider was built at a cost of some $10 billion, to speed protons around an 18-mile underground track at more than 99 percent of the speed of light and smash them together in search of new particles and forces of nature. By virtue of Einstein’s equivalence of mass and energy, the more energy poured into these collisions, the more massive particles can come out of them. And by the logic of quantum microscopy, the more energy they have to spend, the smaller and more intimate details of nature physicists can see.

Since June, after a two-year shutdown, CERN physicists have been running their collider at nearly twice the energy with which they discovered the Higgs, firing twin beams of protons with 6.5 trillion electron volts of energy at each other in search of new particles to help point them to deeper laws.

The most intriguing result so far, reported on Tuesday, is an excess of pairs of gamma rays corresponding to an energy of about 750 billion electron volts. The gamma rays, the physicists said, could be produced by the radioactive decay of a new particle, in this case perhaps a cousin of the Higgs boson, which itself was first noticed because it decayed into an abundance of gamma rays.

Or it could be a more massive particle that has decayed in steps down to a pair of photons. Nobody knows. No model predicted this, which is how some scientists like it.

“We are barely coming to terms with the power and the glory” of the CERN collider’s ability to operate at 13 trillion electron volts, Dr. Spiropulu said in a text message. “We are now entering the era of taking a shot in the dark!”

noting that the history of particle physics is rife with statistical flukes and anomalies that disappeared when more data was compiled

A coincidence is the most probable explanation for the surprising bumps in data from the collider, physicists from the experiments cautioned

Physicists could not help wondering if history was about to repeat itself. It was four years ago this week that the same two teams’ detection of matching bumps in Large Hadron Collider data set the clock ticking for the discovery of the Higgs boson six months later.

When physicists announced in 2012 that they had indeed discovered the Higgs boson, it was not the end of physics. It was not even, to paraphrase Winston Churchill, the beginning of the end.It might, they hoped, be the end of the beginning.

The Higgs boson was the last missing piece of the Standard Model, which explains all we know about subatomic particles and forces. But there are questions this model does not answer, such as what happens at the bottom of a black hole, the identity of the dark matter and dark energy that rule the cosmos, or why the universe is matter and not antimatter.

CERN physicists have been running their collider at nearly twice the energy with which they discovered the Higgs, firing twin beams of protons with 6.5 trillion electron volts of energy at each other in search of new particles to help point them to deeper laws.The main news since then has been mainly that there is no news yet, only tantalizing hints, bumps in the data, that might be new particles and signposts of new theories, or statistical demons.

Or it could be a more massive particle that has decayed in steps down to a pair of photons. Nobody knows. No model predicted this, which is how some scientists like it.

“The more nonstandard the better,” said Joe Lykken, the director of research at the Fermi National Accelerator Laboratory and a member of one of the CERN teams. “It will give people a lot to think about. We get paid to speculate.”

If the particle is real, Dr. Lykken said, physicists should know by this summer, when they will have 10 times as much data to present to scientists from around the world who will convene in Chicago

Such a discovery would augur a fruitful future for cosmological wanderings and for the CERN collider, which will be running for the next 20 years.

The former president also compared Ukrainian leader Volodymyr Zelenskyy to Britain’s wartime leader Winston Churchill, while condemning Russian President Vladimir Putin for launching the invasion of Ukraine in February.

Even as a liberal who has attended abortion rights demonstrations and written about standing up to racism, I sometimes feel afraid to fully speak my mind.

In the classroom, backlash for unpopular opinions is so commonplace that many students have stopped voicing them, sometimes fearing lower grades if they don’t censor themselves.

According to a 2021 survey administered by College Pulse of over 37,000 students at 159 colleges, 80 percent of students self-censor at least some of the time.

Forty-eight percent of undergraduate students described themselves as “somewhat uncomfortable” or “very uncomfortable” with expressing their views on a controversial topic in the classroom.

When a class discussion goes poorly for me, I can tell.

The room felt tense. I saw people shift in their seats. Someone got angry, and then everyone seemed to get angry. After the professor tried to move the discussion along, I still felt uneasy. I became a little less likely to speak up again and a little less trusting of my own thoughts.

This anxiety affects not just conservatives. I spoke with Abby Sacks, a progressive fourth-year student. She said she experienced a “pile-on” during a class discussion about sexism in media

Throughout that semester, I saw similar reactions in response to other students’ ideas. I heard fewer classmates speak up. Eventually, our discussions became monotonous echo chambers. Absent rich debate and rigor, we became mired in socially safe ideas.

when criticism transforms into a public shaming, it stifles learning.

Professors have noticed a shift in their classrooms

I went to college to learn from my professors and peers. I welcomed an environment that champions intellectual diversity and rigorous disagreement

“Second, the dominant messages students hear from faculty, administrators and staff are progressive ones. So they feel an implicit pressure to conform to those messages in classroom and campus conversations and debates.”

I met Stephen Wiecek at our debate club. He’s an outgoing, formidable first-year debater who often stays after meetings to help clean up. He’s also conservative.

He told me that he has often “straight-up lied” about his beliefs to avoid conflict. Sometimes it’s at a party, sometimes it’s at an a cappella rehearsal, and sometimes it’s in the classroom. When politics comes up, “I just kind of go into survival mode,” he said. “I tense up a lot more, because I’ve got to think very carefully about how I word things. It’s very anxiety inducing.”

“First, students are afraid of being called out on social media by their peers,”

“It was just a succession of people, one after each other, each vehemently disagreeing with me,” she told me.

Ms. Sacks felt overwhelmed. “Everyone adding on to each other kind of energized the room, like everyone wanted to be part of the group with the correct opinion,” she said. The experience, she said, “made me not want to go to class again.” While Ms. Sacks did continue to attend the class, she participated less frequently. She told me that she felt as if she had become invisible.

Other campuses also struggle with this. “Viewpoint diversity is no longer considered a sacred, core value in higher education,”

Dr. Abrams said the environment on today’s campuses differs from his undergraduate experience. He recalled late-night debates with fellow students that sometimes left him feeling “hurt” but led to “the ecstasy of having my mind opened up to new ideas.”

He worries that self-censorship threatens this environment and argues that college administrations in particular “enforce and create a culture of obedience and fear that has chilled speech.”

Universities must do more than make public statements supporting free expression. We need a campus culture that prioritizes ideological diversity and strong policies that protect expression in the classroom.

Universities should refuse to cancel controversial speakers or cave to unreasonable student demands. They should encourage professors to reward intellectual diversity and nonconformism in classroom discussions. And most urgently, they should discard restrictive speech codes and bias response teams that pathologize ideological conflict.

We cannot experience the full benefits of a university education without having our ideas challenged, yet challenged in ways that allow us to grow.