When Buster defeats the Brain in a math contest, he is chosen for the school mathathon. Crushed, the Brain says he's decided to become a comedian and declares Buster the new "brain."

After bragging to his pen pal about his basketball skills, Arthur realizes that he has to make good on his boasts when the pen pal comes to visit.

Celebrates a toddler's increasing knowledge of the world, such as that rocks are heavy and flowers are light.

On April 15, 1947, Matt Romano and his father watch the Brooklyn Dodgers season-opener, during which Jackie Robinson, a twenty-eight-year-old rookie, breaks the "color line" that had kept black men out of Major League baseball. Includes facts about Jackie Robinson's life and career.

Lionel counts down the days to his birthday party by making a time capsule and by letting his sister know what he wants for a present.

Buster tries to convince Arthur, the Brain, and his other friends that he not only saw a UFO but also a comet heading for the earth.

When Arthur and his friends buddy up to train for a race that will raise money for their school's literacy drive, Fern seems uninterested in winning or even improving her speed.