Nairobi, May 9 -- Hollywood loves a superpower. Not all involve capes or cosmic rays. Some are cognitive: characters who can remember everything. In movies and on TV, viewers repeatedly encounter those with extraordinary minds who glance once at a page, a room or a face - and later recreate every detail with surgical precision.

"Suits," "Sherlock" and "The Girl with the Dragon Tattoo." Even in children's literature there's fifth grader Cam Jansen, who activates her photolike memory by saying "Click!"

Most recently, it appeared in the television series "The Pitt," set in a hospital emergency department. When the digital patient board suddenly went offline, medical student Joy Kwon saved the day by effortlessly reciting from memory every ...