Final answer:
Ben Carson became interested in Johns Hopkins University Hospital at the age of 10 because of his fascination with medicine and his desire to help people. He saw a medical book with pictures of the brain, which inspired him to pursue a career in neurosurgery.
Step-by-step explanation:
Ben Carson became interested in Johns Hopkins University Hospital at the age of 10 because he had a deep fascination with medicine and healing. As a child, he witnessed his mother struggle with health issues, which sparked his interest in finding ways to help people.
One day, he saw a medical book that his mother had been studying, and he became captivated by the pictures of the brain. This inspired him to want to learn more about the field of medicine and eventually become a neurosurgeon.