Katina Velahos (R) and Zoe Kousoulis make a rubbing of the name of Danielle Kousoulis, daughter of Zoe Kousoulis, who perished in the attacks, from one of the panels containing the names of the victims of the attacks on the first day that the 9/11 Memorial was opened to the public at the World Trade Center site in New York, September 12, 2011. [Photo/Agencies]

Olivia Norton (R) and Aubrey Finamore, children of Amy Norton and Peter Finamore, whose cousin Kevin Bracken was lost in the attacks, play near stone benches on the first day that the 9/11 Memorial was opened to the public at the World Trade Center site in New York, September 12, 2011. [Photo/Agencies]