It's Science Fair time at Springfield Elementary, and Lisa sets out to win the top prize. Her daring experiment into the genetic similarities between the members of the Simpson family blows up in her face when she discovers that one member of her immediate family is not a blood relative. You'll never guess who it is! Meanwhile, Bart and Milhouse stage their own experiment in sleep deprivation, which results in a lot of other things blowing up! Sign up with the Simpsons in October!