Etched in bronze panels placed around two memorial pools are nearly 3,000 names of people who were killed on at the World Trade Center on September 11, 2001. Although many visitors to the moving memorial assume that the names are randomly placed, in reality the planners of the site used a complex algorithm to decide where the names should be placed. To read about why this algorithm was used and how it was devised, click through to this story at Scientific American.