Two words have the power to change a person's outlook: good . . . considering. Jothy Rosenberg has heard this nearly his whole life, starting at age sixteen when bone cancer led to an above-knee amputation of his right leg. Three years later, when cancer forced the removal of a lung and acted like a death sentence, this epithet continued. Rosenberg grew tired of only being "good considering" his disability. In the decades since he beat cancer,...