Many kids who are high school freshmen this year weren’t yet born when 9/11 happened. For them, the deadliest attack in American history feels like Pearl Harbor did to Baby Boomers, like the Kennedy assassination did to Gen Xers and like the fall of the Berlin Wall did to Millennials.

It feels a bit like ancient history.

But America’s current history teachers — the first generation of educators to tackle 9/11 in the classroom — feel a personal responsibility to pass on the lessons learned from Sept. 11, 2001 to today’s kids.

How does one squeeze arguably the most pivotal day in modern U.S. history into an already tight lesson plan? We spoke with history teachers from different parts of the country to find out how they are keeping the tragic memories of 9/11 relevant for a new generation of Americans.

“I asked my kids, ‘What happened on 9/11?,’ and one of them raised their hand and said, ‘Didn’t it have to do with a car bombing or something?,’” said Mary Huffman, 38, a fifth-grade social studies teacher in South Carolina. “The kids in my fifth grade class were born in 2005 and they have no idea about 9/11.”

“I asked my kids, ‘What happened on 9/11?,’ and one of them raised their hand and said, ‘Didn’t it have to do with a car bombing or something?" —Mary Huffman (Fifth Grade Teacher, South Carolina)

Perhaps it’s not surprising that a group of fifth graders in South Carolina don’t know much about 9/11. But what about high school juniors in Washington, D.C. — one of the cities targeted by a hijacked airplane that day?

“They actually don’t know about it. They’re a bit mystified,” said Kevin Fox, 44, an 11th-grade social studies teacher with 20 years of classroom experience in the District of Columbia. “I take that for granted a bit. I think it’s maybe one flaw of being here for so long.”

“Some of the parents really don’t know how to start talking about it, so they leave it up to teachers to know the most appropriate ways to talk about it,” Huffman said of her experiences.

While history teachers in many parts of America are tasked with being the first people to introduce children to the horrors of 9/11 every school year, educators in New York likely find the topic is still fresh in the minds of their students.

“I’ve never come across a kid who was like, ‘I’ve never heard of 9/11. I don’t know what happened,’” said Sean Robertson, 34, a 7th and 8th-grade history teacher with more than 10 years of classroom experience in Harlem. “They seem to have a pretty good understanding and I think a lot of that has to do with the fact that we’re here in the city and even 15 years on, it’s kind of a present idea in the minds of New Yorkers.”

Robinson said that while all of his students are aware of the fact behind Sept. 11, every year he can count on at least one student who has a “rabid fascination” about the attacks. “I had a kid this past year who knew all the flight numbers and where they took off, where they were headed,” Robinson said.

Although advanced knowledge about 9/11 may be mostly limited to kids in New York, interest in the topic seems to be universal, at least according to the teachers with whom we spoke.

“They’re definitely interested in it. And it surprises a lot of them,” said Jennalee Kwezi, a 10th-grade history teacher in Houston, Texas.

Fox feels his recent students have taken more interest in learning about Sept. 11 than those he taught in the years immediately following the attacks. “They’re very curious now. I’d say in the five years after it happened, the kids were sick of it,” Fox said. “They were like, ‘I don’t want to talk about this anymore,’ because it was just such a part of our lives in those years. They didn’t want to go over the images. It just felt like too much.”

SHOULD KIDS SEE THE GRAPHIC IMAGERY OF 9/11?

It’s tough to blame those past students for not engaging much when lessons about 9/11 came up. The attacks happened in the early days of the 24-hour news cycle — Fox News and MSNBC were only five years old — and in the infancy of online news. The stunning video and photography from that day were virtually inescapable. But when teachers show today’s kids the raw images from 9/11, many are seeing them for the first time.

Kwezi said she shows her students CNN’s coverage of the attacks — including video of the twin towers falling in New York — but she avoids showing clips that depict trapped people jumping from the towers after the planes had hit. She said the images invariably “shock” her students.

All the teachers we spoke with agreed the graphic images from Sept. 11 are an integral part of educating students on the attacks.

“The images always help,” Fox said of engaging his students at Washington’s Cardozo Education Campus.

"The images always help." —Kevin Fox (Eleventh Grade Teacher, Washington, D.C.)

“I love using video clips,” Huffman said. She shows her fifth-grade students news footage that she herself taped from TV in the days following the attacks. “I show clips of that and it shows how surprised and scared the reporters were … We see reporters breaking down and crying and we see the fear in their eyes. We then talk about how the students would have felt being in the same situation.”

Huffman also uses clips from the 2006 Hollywood film “World Trade Center” as an introduction to the topic, showing the devastation and how people were buried in rubble from the collapsed buildings.

At Harlem Academy, Robertson takes advantage of his classroom’s close proximity to the primary attack site. He takes his students to the 9/11 memorial every year, but only after showing them the 2011 documentary “Rebirth,” which follows the lives of people who lost loved ones in the attacks. He said the movie gives the kids a few names to look for when they visit the memorial.

Robertson starts his 9/11 chapter with the opening clips of Michael Moore’s 2004 documentary “Fahrenheit 9/11,” which also show the devastation of New York City on that day. He stops the film “before Moore starts editorializing a little bit,” Robertson said.

Fox conceded “there’s some great information in ‘Fahrenheit 9/11’,” but said he’s never used any feature films in class when talking about the subject. He recommends his students check out 2006’s “United 93” or 2002’s “WTC: The First 24 Hours” in their free time.

This year, Fox is taking a nontraditional approach to teaching his students about 9/11. In late September, he’s taking them to see a musical called “Come From Away” at Washington’s historic Ford Theatre. The show is based on the true story of a small Canadian town that saw its population double on Sept. 11, 2001, when dozens of planes were forced to land there after rerouting because of the attacks.

“It’s a musical about 9/11,” Fox said with an incredulous laugh. “It looks really good. It looks like a human take on how we deal with the face of tragedy. So this year, uniquely, I’ll be using a staged musical to help teach the story.”

‘MAKE IT PERSONAL’

Three of the four teachers we interviewed were national award-winning educators and all of them are highly regarded by their past and current students, based on online reviews. They’ve found unique ways to make 9/11 an engaging topic for kids who were too young to have their own memories of the attacks.

They suggested a surefire way to connect today’s students with Sept. 11: Make it personal.

“I usually cry when I tell the story [of 9/11] and that always brings some of them to tears because it makes it a little more real for them,” Kwezi said.

Of the teachers we interviewed, her classroom at Houston’s Westside High School is the farthest from any of the Sept. 11 attack sites. But she finds that survivor stories seem to transport her students to ground zero.

“I think when they watch the testimonies of survivors, it becomes an actual person to them,” Kwezi said. “That’s what they connect with the most.”

Driving home the personal nature of 9/11 — regardless of geography — Kwezi gives her students a homework assignment to interview two people about their memories of the attacks. “That has always proven to be a cool experience because the kids come back the next day, and they’re like, ‘You’re not going to believe what my dad said,’ or, ‘What my mom said she remembers!’”

Having students interview people they know, in order to get a better understanding of Sept. 11, is an assignment that also seems to work in classrooms that are much closer to ground zero. Robertson said he uses a similar method, asking his students to interview someone who was at least 18 years old when the attacks happened.

“Typically it’s a parent or an older sibling. It gives them that personal narrative of their family and 9/11,” Robertson said. “A big part of the push of my curriculum is using primary sources, but also doing the work of a historian.”

Robertson takes the idea of having his students play historians literally. For one assignment, he has the kids fill the role of Alice Greenwald, director of the 9/11 Memorial Museum.

The students are asked to weigh different artifacts of the 9/11 narrative — a pair of bloody shoes and mugshots of the hijackers, for example — and to figure out what should be included in the museum and what should be left out. He tasks them with arguing for their various inclusions and exclusions and to convince undecided students to join their side.

"How do you tell the story of that day, while keeping the idea of empathy? How do you not retraumatize people but tell the story?" —Sean Robertson (Seventh/Eighth Grade Teacher, New York City)

“The kids have to then grapple with the judgement call of, ‘How does this fit in with the story of 9/11, while also considering the feelings of victims’ families. How do you tell the story of that day, while keeping the idea of empathy? How do you not retraumatize people but tell the story?,” Robertson said.

Robertson has done this lesson for the past three years, and it’s part of the reason he was named New York state’s best history teacher of 2016 as part of the Gilder Lehrman Institute of American History’s National History Teacher of the Year awards.

“It’s kind of a meta-exercise into how history is written and understood,” Robertson said of his lesson. “They learn that in telling a story factually, you might make some people uncomfortable.”

Perhaps unexpectedly, Robertson has yet to have a student who lost a direct family member on Sept. 11 — but in her South Carolina classroom, Huffman had one student whose father was killed.

Huffman’s classroom is full of historical artifacts, ranging from World War I military uniforms to a set of railroad tracks from the 1800s. She described the room as looking “like a museum.” One of those pieces of memorabilia is an American flag from the 9/11 Memorial Museum that contains the names of all the victims.

“One of my girls, her dad died in 9/11. He was a firefighter and was killed right before she was born. She spoke about it and we cried when she talked about her dad,” Huffman said. “The little girl looked up at the flag — and even though there are 3,000 names on it — in about one second she found his name. We were all stunned. She was crying because she couldn’t believe she found it that fast.” She now has a picture of that student hanging under the flag.

Other artifacts Huffman uses when teaching 9/11 are newspapers and magazines from the days and weeks following the attacks. “We analyze different articles in them and the students really get a firsthand account of how we felt as Americans during that time,” she said.

In Washington, Fox said he feels a timeline of events leading up to 9/11 is a solid way to put the attacks into context. “I run through a timeline of terror and our government’s role and relationship with it,” he said. “It’s not giving justification [for the attacks] by any means, but it shows that attacks occur and there’s a cause and effect to things.”

Fox also uses a world map that shows the sites of major terror attacks internationally. “That really resonated with the kids because they see that, ‘Well, 9/11 happened to us but look at all these other attacks.’ Terror is something that’s happening all over the world.”

Driving home the idea that terror is not limited to Middle Eastern groups like al-Qaida or ISIS, Fox — whose students are predominantly African-American and Latino — compares those groups to America’s Ku Klux Klan when speaking to his students.

“I compare the events to other terrorism that has happened in our country. We look at the definition of a terrorist organization and then examine some groups,” Fox said. “Certainly the African-American students are very aware of the KKK and their history. Making those connections helps make it resonate.”

Perhaps the blunt nature of his style is one of the reasons Fox was named the District of Columbia’s best history teacher of 2016 by Gilder Lehrman.