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This photo made available by the Library of Congress shows a demonstration at the Red Cross Emergency Ambulance Station in Washington during the influenza pandemic of 1918. (Library of Congress via AP, File)

Like the Spanish flu, the coronavirus may never entirely disappear from our midst. Instead, scientists hope it becomes a mild seasonal bug as human immunity strengthens through vaccination and repeated infection. That could take time. 

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An American flag is unfurled at the Pentagon in Washington, Saturday, Sept. 11, 2021, at sunrise on the morning of the 20th anniversary of the terrorist attacks. (AP Photo / Alex Brandon)

The document released Saturday, on the 20th anniversary of the attacks, is the first investigative record to be disclosed since President Joe Biden ordered a declassification review of materials that for years have remained out of public view. 

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(L-R)  former President Bill Clinton, former First Lady Hillary Clinton, former President Barack Obama, former First Lady Michelle Obama, President Joe Biden, First Lady Jill Biden, former New York City Mayor Michael Bloomberg, Bloomberg's partner Diana Taylor, Speaker of the House Nancy Pelosi and Senate Minority Leader Charles Schumer stand for the national anthem during the annual 9/11 Commemoration Ceremony at the National 9/11 Memorial and Museum Sept. 11, 2021 in New York. (Chip Somodevilla / AP)

Presidents Joe Biden, Barack Obama and Bill Clinton all gathered at the site where the World Trade Center towers fell two decades ago. 

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A memorial flag is brought onto the stage during ceremonies to commemorate the 20th anniversary of the Sept. 11 terrorist attacks, Saturday, Sept. 11, 2021, at the National September 11 Memorial & Museum in New York. (AP Photo/John Minchillo)

The ceremony at ground zero in New York began exactly two decades after the deadliest act of terrorism on U.S. soil started with the first of four hijacked planes crashing into one of the World Trade Center’s twin towers.

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President Joe Biden and first lady Jill Biden watch as a carry team moves the transfer case containing the remains of Navy Corpsman Maxton W. Soviak, 22, of Berlin Heights, Ohio, during a casualty return Sunday, Aug. 29, 2021, at Dover Air Force Base, Del. (AP Photo / Carolyn Kaster)

This 9/11 comes little more than two weeks after a suicide bomber in Kabul killed 13 U.S. service members as the military concluded its withdrawal from Afghanistan. 

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In this Sept. 11, 2001 file photo, people covered in dust from the collapsed World Trade Center buildings, walk through the area, in New York. (AP Photo / Suzanne Plunkett, File)

Two decades after the twin towers’ collapse, people are still coming forward to report illnesses that might be related to the attacks. 

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The terrorist attacks of Sept. 11, 2001 have changed the world in ways both “subtle and profound,” said DePaul University history professor Thomas Mockaitis. (WTTW News)

Saturday marks the 20th anniversary of the deadliest terrorist attack on U.S. soil. Local experts join us to discuss what we’ve learned about terrorist threats since then — and how safe we are today.

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A woman walks by the colorful murals that surround the foundation for 2 World Trade Center, Wednesday, Sept. 8, 2021 in New York. (AP Photo / Mark Lennihan)

Two planned skyscrapers, a performing arts center and a church are still unfinished at the World Trade Center complex, which plays host Saturday to the annual ceremony honoring nearly 3,000 people killed in the attacks.

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Margot Eckert stands by a display of pictures of her brother-in-law Sean Rooney and sister Beverly Eckert at her home, Thursday, July 15, 2021, in Springfield, Mass. (AP Photo / Robert Bumsted)

A collection of some 22,000 personal artifacts — some on display at the 9/11 Memorial & Museum, and others on display at other museums around the country — provide a mosaic of lost lives and stories of survival: wallets, passports, baseball gloves, shoes, clothes and rings.

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Comedian Dave Chappelle arrives at Kennedy Center for the Performing Arts to receive the 22nd Annual Mark Twain Prize for American Humor in Washington on Oct. 27, 2019, left, and comedian Jon Stewart performs at the 9th Annual Stand Up For Heroes event in New York on Nov. 10, 2015. (AP Photo)

A star-studded group of comedians will perform for one night only at Madison Square Garden to mark the 20th anniversary of 9/11.

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President Joe Biden returns a salute as he walks to board Air Force One to travel to Louisiana to view damage caused by Hurricane Ida, Friday, Sept. 3, 2021, in Andrews Air Force Base, Md. (AP Photo / Evan Vucci)

President Joe Biden will visit all three 9/11 memorial sites to commemorate the 20th anniversary of the Sept. 11 attacks and pay his respects to the nearly 3,000 people killed that day. 

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Six years ago President Barack Obama named the Pullman neighborhood a national monument. And Labor Day weekend, the visitor center in the old clock tower administration building will finally open. (WTTW News)

Six years ago President Barack Obama named the Pullman neighborhood a national monument. On Labor Day weekend, a new visitor center in the century-old clock tower will finally open. Geoffrey Baer visited Pullman to get an exclusive first look.

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Afghan boys walk near a damaged house after airstrikes in two weeks ago during a fight between government forces and the Taliban in Lashkar Gah, Helmand province, southwestern, Afghanistan, Saturday, Aug. 21, 2021. (AP Photo / Abdul Khaliq)

Potential Islamic State threats against Americans in Afghanistan are forcing the U.S. military to develop new ways to get evacuees to the airport in Kabul, a senior U.S. official said Saturday.

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Hundreds of people run alongside a U.S. Air Force C-17 transport plane as it moves down a runway of the international airport, in Kabul, Afghanistan, Monday, Aug.16. 2021. (Verified UGC via AP)

Thousands of Afghans rushed into Kabul’s main airport Monday, some so desperate to escape the Taliban that they held onto a military jet as it took off and plunged to their deaths. At least seven people died in the chaos, U.S. officials said, as America’s longest war ended with its enemy the victor.

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President Joe Biden speaks about Afghanistan from the East Room of the White House, Monday, Aug. 16, 2021, in Washington. (AP Photo/Evan Vucci)

Striking a defiant tone, President Joe Biden said Monday that he stands “squarely behind” his decision to withdraw U.S. forces from Afghanistan as he acknowledged the “gut-wrenching” images coming out of the country after the swift Taliban takeover of the government.

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An empty pedestal in Grant Park in July 2020, where a statue of Christopher Columbus stood recently. (WTTW News)

A “racial healing and historical reckoning project” launched by Mayor Lori Lightfoot after she removed the city’s three statues of Christopher Columbus has stalled, and the statues remain in storage a year after they were wrenched from their pedestals.