When we think about 9/11, we often only think of the tremendous loss of life on that day. But what we sometimes forget about are those who made it; the thousands of people who survived the attacks, but have had to carry it with them every day since. 

Firefighter Jay Jonas and Port Authority Police Officer Will Jimeno were in the Twin Towers on September 11 — 100 stories of the World Trade Center fell on top each of them. But they got back up and survived.

How did they move on from this attack? And how should we?

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Fifteen of the 19 hijackers on 9/11 were from Saudi Arabia, which was also the home of al-Qaeda’s leader, Osama Bin Laden. In the days after September 11, dozens of his friends, family members and business associates left the U.S. on secret flights bound for The Kingdom of Saudi Arabia. That has led to questions that four presidents have avoided answering:

What role did the Saudi government play in the attacks? What did it know?

Even worse, did it help?

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Immediately after 9/11, investigators began piecing together the plot. In the flight manifests, they discovered a pattern: A team of five terrorists hijacked every plane that day, except for one. United Airlines Flight 93 had only four hijackers. Investigators believed one person was missing from that group.

Who was the 20th hijacker — if there even was one? And is there a 9/11 hijacker still on the loose?

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Before 9/11, FBI Special Agent John O’Neill kept setting off alarms about the emerging terrorist organization al-Qaeda and their mysterious leader Osama Bin Laden. As a result of his warnings the FBI knew terrorists were planning a big attack and the CIA even had eyes on two of the eventual hijackers prior to the attacks.

So what went wrong? Why didn’t they capture the hijackers? What more could law enforcement have done to stop the attacks? And could they have been prevented?

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After the first two hijackings, the nation’s air traffic controllers quickly and efficiently grounded thousands of planes flying to and over the continental United States. Their quick thinking is said to have potentially saved countless lives.

But what if another plane was meant to be hijacked that day, and never made it off the ground? What if there was a fifth plane on 9/11?

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With the Capitol under attack, the President on Air Force One, and the Defense Secretary missing, Vice President Dick Cheney was the most powerful man in the country on the morning of 9/11. From a bunker beneath the White House, he gave fighter pilots flying above the Capitol permission to shoot down hijacked commercial planes.

But did Cheney actually have the authority to issue this order? Did he and President Bush connect before or after Cheney ordered the fighters into battle? And was the U.S. even ready to shoot down any hijacked flights?

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Every defense mechanism the U.S. government had on 9/11 failed except for one: the passengers and crew aboard United Airlines Flight 93. They were on the final plane to be hijacked that day and heard reports of the attacks from loved ones on the ground. Then they rallied to stop the terrorist plot.

But where was the plane headed before it crashed? What was the intended target of the Flight 93 hijackers?

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After both towers of the World Trade Center were hit on September 11, 2001, first responders coordinated the largest emergency response in New York City’s history. But their heroism at Ground Zero was hampered by institutional bureaucracy and ultimately undone by decisions made decades earlier, when the Twin Towers were built.

So why did these iconic structures and architectural marvels fall so fast? Could more people have been rescued from the towers? And could some of those deaths have been avoided?

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