Friday marks the 14th anniversary of one of the worst tragedies in U.S. history.
A Palm Beach County man is teaching children about 9/11, a day he thinks about every single day.
John Napolitano lost his son John Jr., that day.
His son was a New York City firefighter and ran into one of the twin towers of the World Trade Center when many were running away to safety.
Napolitano is a teacher at Bright Futures Academy in North Palm Beach.
Every year he teaches his students about how our country was affected on September 11th.
This year he is teaching students who weren't even born when the tragedy happened.
"They're going to see it on TV. They're going to see the planes hit the Pentagon, they’re going to see the planes hit the towers. They're going to see the towers come down. So it's as real to them as it was to us," he said.
John said this is a chance to teach students about the heroes from that day and honor those who passed away as well as those who survived.