(Andresr, Getty Images) For many people born with mild heart defects, successful surgery early in life seemed like the happy end of their story. “Doctors told them, ‘You’re fixed, go enjoy the rest of your life,’” said Dr. James Priest, a pediatric cardiologist and assistant professor at the Stanford University School of Medicine. “They weren’t…

First lady Jackie Kennedy with twins Debbie and Donna Horst in 1961. (Photo courtesy of Robert Knudsen. White House Photographs. John F. Kennedy Presidential Library and Museum, Boston) On Feb. 1, 1961, twins Debbie and Donna Horst arrived at the White House to fanfare. The 6-year-olds, decked out in fancy dresses and satin sashes, found…

Amanda Tinney (left) and sister, Kelli Tinney, at the 2018 Go Red for Women luncheon in New Orleans. (Photo courtesy of Jeff Strout Photography) Having spent the day at a cousin’s cookout, 25-year-old Kelli Tinney and her 27-year-old sister Amanda went back to their house, turned on the television and flopped onto the couch. They…

Amanda Tinney (left) and sister, Kelli Tinney, at the 2018 Go Red for Women luncheon in New Orleans. (Photo courtesy of Jeff Strout Photography) Having spent the day at a cousin’s cookout, 25-year-old Kelli Tinney and her 27-year-old sister Amanda went back to their house, turned on the television and flopped onto the couch. They…

Amanda Tinney (left) and sister, Kelli Tinney, at the 2018 Go Red for Women luncheon in New Orleans. (Photo courtesy of Jeff Strout Photography) Having spent the day at a cousin’s cookout, 25-year-old Kelli Tinney and her 27-year-old sister Amanda went back to their house, turned on the television and flopped onto the couch. They…

Amanda Tinney (left) and sister, Kelli Tinney, at the 2018 Go Red for Women luncheon in New Orleans. (Photo courtesy of Jeff Strout Photography) Having spent the day at a cousin’s cookout, 25-year-old Kelli Tinney and her 27-year-old sister Amanda went back to their house, turned on the television and flopped onto the couch. They…

(Kateryna Kon/Science Photo Library, Getty Images) For years, Jan H. Mitchell felt terrible. “The fatigue I was experiencing was unreal,” said Mitchell, 62, of Paris, Tennessee. “It was beyond feeling tired; I would come home from work and had no energy to do anything.” Mitchell saw doctor after doctor. After a stress test, a sleep…

(Kateryna Kon/Science Photo Library, Getty Images) For years, Jan H. Mitchell felt terrible. “The fatigue I was experiencing was unreal,” said Mitchell, 62, of Paris, Tennessee. “It was beyond feeling tired; I would come home from work and had no energy to do anything.” Mitchell saw doctor after doctor. After a stress test, a sleep…

(Kateryna Kon/Science Photo Library, Getty Images) For years, Jan H. Mitchell felt terrible. “The fatigue I was experiencing was unreal,” said Mitchell, 62, of Paris, Tennessee. “It was beyond feeling tired; I would come home from work and had no energy to do anything.” Mitchell saw doctor after doctor. After a stress test, a sleep…

(Kateryna Kon/Science Photo Library, Getty Images) For years, Jan H. Mitchell felt terrible. “The fatigue I was experiencing was unreal,” said Mitchell, 62, of Paris, Tennessee. “It was beyond feeling tired; I would come home from work and had no energy to do anything.” Mitchell saw doctor after doctor. After a stress test, a sleep…