David Fajgenbaum’s life changed forever one summer day in 2010. After experiencing fatigue, his liver, kidneys, bone marrow, heart, and lungs suddenly began to shut down. He was admitted to the intensive care unit where doctors found that he had a retinal hemorrhage that left him blind in his left eye. David drifted in and out of consciousness, was put on a feeding tube, and received blood transfusions. In weeks, the 26-year-old medical student sharply deteriorated and was given last rites.