Remembering Sept. 11 Remembering Sept. 11

Firefighters work beneath the vertical struts of the World Trade Center's twin towers, in Lower Manhattan, following the attacks of Sept. 11, 2001. Mark Lennihan/Associated Press hide caption

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Mark Lennihan/Associated Press

Sept. 11 First Responder Fights On Behalf Of Others Who Rushed To Help

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Members of the Taliban militia ride in vehicles during Afghanistan's annual Independence Day parade in Kabul on Aug. 19, 2001. Afghanistan was largely cut off from the world during the Taliban's rule from 1996 to 2001. That changed dramatically after the Sept. 11 attacks. Saeed Khan/AFP/Getty Images hide caption

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Saeed Khan/AFP/Getty Images

President Obama, first lady Michelle Obama, Vice President Joe Biden and others observe a moment of silence on the South Lawn of the White House on Thursday to mark the 13th anniversary of the Sept. 11 attacks. Charles Dharapak/AP hide caption

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Charles Dharapak/AP

"Timescape" finds words in the news associated with Sept. 11, and weights them according to prominence in a story — not just how often they appear. Gaurav Bradoo hide caption

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Gaurav Bradoo

An Algorithm Is A Curator At The Sept. 11 Museum

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Family members of victims of the Sept. 11 attacks demonstrate against the decision to transfer the unidentified remains to a repository at the World Trade Center site. Eric Thayer /Reuters /Landov hide caption

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Eric Thayer /Reuters /Landov

A woman looks out at One World Trade Center from inside the 9/11 Empty Sky memorial at Liberty State Park in Jersey City, N.J., on Wednesday. Americans commemorated the 12th anniversary of the Sept. 11 attacks with solemn ceremonies and pledges to not forget the nearly 3,000 people killed. Gary Hershorn/Reuters/Landov hide caption

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Gary Hershorn/Reuters/Landov

Robert Peraza, who lost his son Robert David Peraza, pauses at his son's name at the North Pool of the 9/11 Memorial at the site of the World Trade Center. Justin Lane/pool/Getty Images hide caption

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Justin Lane/pool/Getty Images

Singer Patti LaBelle performs during the "Concert For Hope" event, hosted by Washington National Cathedral, to mark the tenth anniversary of the 9/11 terrorist attacks. Alex Wong/Getty Images hide caption

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Alex Wong/Getty Images

Alan Jackson

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Keri McMorrow, 7, visits the memorial pool where her uncle's name is engraved, during tenth anniversary ceremonies of the September 11, 2001 terrorist attacks at the World Trade Center site. Pool/Getty Images hide caption

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Pool/Getty Images

Kids and Sept. 11: The Day 'Children Realized ... Grownups Were Vulnerable'

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