Scott Kelly was already known as a man who contributed to his country as an astronaut, but when he entered into a year-long research study to compare how space affects the human body he demonstrated his commitment to science, health, and the future of space travel. As he traveled into space and then returned a year later, his health information was compared with that of his twin brother, also an astronaut. Scott's story, with its every day notations of life in space, provides not only a look into his journey, but one filled with wisdom, humor, the sharing of his emotions, and his relationships. It is a must-read.