Genetic Mutation Gives Boy Super-Strong Muscles
NPR's Robert Siegel talks with Dr. Elizabeth McNally talks about a study, published in today's New England Journal of Medicine, about a four-year-old boy born in Germany who was born with well-defined muscles. The child can lift seven-pound weights over his head.

Images of the child at six days and seven months. Arrows point to his unusually large muscles. New England Journal of Medicine hide caption

Images of the child at six days and seven months. Arrows point to his unusually large muscles. New England Journal of Medicine hide caption