Chalk artist Erica LuBer, left, helps move a chalk portrait of Toshiya Kuge, from Osaka, who was one of the 40 passengers and crew who perished on Flight 93, outside the Flight 93 National Memorial on Thursday in Shanksville, Pa., as the nation prepared to mark the 20th anniversary of the Sept. 11, 2001 attacks on Saturday. A group of 11 chalk artists from around the country worked on the 40 portraits for two days outside the memorial. (Associated Press)