A gun turret on the sunken Australian warship HMAS Sydney. All 645 people aboard the Sydney died. AP hide caption

itoggle caption AP

Kate Frego pins the turban of her mother, Aida Essenburg. Before Essenburg died in July of this year, she sat down with a dignity therapist to record the history of her life in what became a 50-page document. Courtesy of Kate Frego hide caption

itoggle caption Courtesy of Kate Frego

A boom sweeps around a tank at a sewage treatment plant in Coos Bay, Ore. Even though sewage water can be treated and cleaned, psychologists say getting the "cognitive sewage" out of the water is much more difficult. Jeff Barnard/AP hide caption

itoggle caption Jeff Barnard/AP

Using revamped photo lineup procedures, a Dallas police officer shows a victim of a robbery a single photo of a suspect in an interview room at police headquarters in 2009. Dallas officially adopted lineup reforms two years ago, and last month the state of Texas said all police departments must review lineup procedures. LM Otero/AP hide caption

itoggle caption LM Otero/AP

Union College psychology professor Chris Chabris and his students staged an outdoor fight to study inattentional blindness. Matt Milless/Union College hide caption

itoggle caption Matt Milless/Union College

Robert Dixon Sr. holds a photograph of his son, Robert Dixon Jr. (far right), his son's mentor Bob Stuart, and himself (far left). Lianne Milton for NPR hide caption

itoggle caption Lianne Milton for NPR

Joseph Corbett (center), who was convicted of killing millionaire Adolph Coors III, is led to the Jefferson County courthouse in Golden, Colo., in 1961. John F. Urwiller/AP hide caption

itoggle caption John F. Urwiller/AP

A mother watches a video taken of herself playing with her daughter for Bellevue Hospital's Video Interaction Project. Former hospital employee Brenda Woodford reviews the footage, offering positive feedback and areas for improvement. Courtesy of Children of Bellevue Archives hide caption

itoggle caption Courtesy of Children of Bellevue Archives

The definitions for some mental disorders may change in the new edition of the DSM. Mark Strozier/iStockphoto.com hide caption

itoggle caption Mark Strozier/iStockphoto.com

Brothers Eric (from left) and Tom Hoebbel have the same genes, but they couldn't be more different. Courtesy of Tom Hoebbel hide caption

itoggle caption Courtesy of Tom Hoebbel