Mary and Henry have invited their friends to come to their home and play science. They have a hard time deciding where to start. They have learned so much in a week! Bolin and Mohamed came this time to visit Henry. Mary got a visit from Stephanie, Lolita, and Katrina. All children from the same school and in the same classes.Mary agreed to teach her friends about Aluminum and build a battery at home, with the help and permission from Mom. Henry decided to talk about semiconductors and Silicon. Also, how to use some Copper wires to try some fun home experiments, with Dad's help and supervision.