|The Housekeeper and the Professor|
Eventually she brought her 10-year old son to the professor's house after school and the professor called him Root because the flat top of his head reminded him of the square root sign. Root and the professor found they both loved the same baseball team even though the professor only remembered the players from before the accident.
What was fun was how the professor shared his love of mathematics with the housekeeper and her son. He taught them about prime numbers and i, the square root of -1. This story was enjoyable for the shared joy of math as well as the challenge of working with a person who has had a brain injury.