John Green speaks at 9/11 commemoration

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TUCSON, Ariz. -- As first responders and others gathered at Reid Park on the 10 year anniversary of 9/11, speakers delivered messages of hope.  Among those who spoke was the father of the youngest victim from Tucson's January 8 shooting.

Christina Taylor Green was born on 9/11.  John Green spoke to the crowd on what would have been his daughter's 10th birthday.

Christina Taylor Green was born on September 11, 2001 and died on January 8, 2011, two of the most tragic days in American history.

One thing that became crystal clear to my family while being in the middle of both of these national tragedies, for all the evil in the world, there are many, many good people.

It's painful to remember our loved ones who are no longer with us.  Let's do them the honor of making this a better world to live in.