On Lucy's first day of second grade, she's excited to meet her new teacher, Miss Flippo, and find out everything's she's going to learn about this year in school. And when Miss Flippo tells the class that they're going to have their very own science lab, complete with lab coats and goggles, Lucy can't wait to start exploring.

But one thing is troubling her. The tree that sat outside her first grade classroom all year is gone. Where are the squirrels going to live?
Inspired by her classroom lab, Lucy starts her own research mission to find out what happened to the tree, and then to...

Autumn has arrived, and at Granite City Elementary School everyone is gearing up for the biggest and best event of the year, the Harvest Festival. The whole school is excited about the games, the contests, the food, and, most of all, the costumes Everyone except Lucy. She doesn't like dressing up, and has no desire to be a fairy princess or rock star, even for one day.

But Lucy is excited about the new science unit Miss Flippo has started: the states of matter. Lucy and her friends understand solids and liquids. They're easy. But gasses are more difficult to grasp.

When the class...