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Christina Wells says watching herself sing onstage during Tuesday’s episode of “America’s Got Talent” was an out-of-body experience. The 42-year-old registered nurse and mother of two teenage sons earned a standing ovation from the judges and the crowd after belting a powerhouse rendition of the “Hairspray” tune “I Know Where I’ve Been.” But, like it is for so many aspiring singers, life wasn’t just about the music. As a nurse in the Memorial Hermann Health System, Wells helped evacuate hospitals and connect patients with appropriate levels of care during Hurricane Harvey. The ordeal inspired her to write and produce “Come Hell or High Water,” a song for the city.