Many of us have something of sentimental value that we keep with us, or something we think brings us good fortune. For some it may be a piece of jewelry, for others a teddy bear.
For Welles Crowther it was a red bandanna given to him by his father when he was six years old.
As he grew up, he still always had his red bandanna with him. When he played football he wore it under his helmet.
He was deciding between becoming a firefighter, or getting a job on Wall Street.
He finally settled on being an equity trader and got a job in the World Trade Center – His office was on floor 104 in the South Tower.
Welles was in the building on 9/11. When the first plane hit he called his mom to tell her he was okay.
When the second plane hit the South Tower, he was waiting with many others for the elevator.
Ling Young was one of the other people waiting with Welles. She heard a man shout for everyone to follow him, he had found the stairs. He was calm and confident.
Welles guided them down to meet with firefighters, then he went back up again to try and save more people.
This was when the South Tower collapsed. His body was found in the rubble six months later.
Several months later Welles parents spotted a story in the New York Times, and something about it struck a chord.
A woman called Judy Wein was telling her story about how a mysterious stranger with a red bandanna had led her to safety and saved her life.
Welles mother knew it must be her son.
So she sent this photo to Judy and Ling who both agreed this was the man who had saved their lives, and those of many others.
What a hero.