Ada Twist is a very curious girl who shows perseverance by asking questions and performing experiments to find things out and understand the world.

"When Rosie Revere's Uncle Ned gets a little carried away wearing his famous helium pants, it's up to Ada and friends to chase him down. As Uncle Ned floats farther and farther away, Ada starts asking lots of questions: How high can a balloon float? Is it possible for Uncle Ned to float into outer space? And what's the best plan for getting him down?"--

For the first time in years Eerie Elementary is planning a science fair, which may not be a good idea in a school which is alive and out to get the students--but when Sam and his friends find a book of experiments that contains all of Orson Eerie's notes, it may turn out to be the key they need to finally understand the mad scientist.

"Curse you, Perry the Platypus! Enter the world of Dr. Doofenshmirtz as he reveals his crazy plots, wacky ideas, and outrageous inventions! Learn how the doctor built some of his evil creations (like the Hot Dog Revenge-inator), opened up a school for budding scientists, plus other ideas he has for trying to defeat his ultimate enemy, Perry the Platypus."--P. [4] of cover.