When seven-year-old Bean plays a mean trick on her sister, she finds unexpected support for her antics from Ivy, the new neighbor, who is less boring than Bean first suspected.

When Bean's parents leave her in the care of her older sister Nancy for the afternoon, she enlists her neighbor and best friend Ivy to come over and teach Nancy how to be a really good babysitter.

In this seventh entry in the New York Times–bestselling series, two unlikely best friends get creative as they prepare for the Science Fair.
It's the Science Fair, and the second grade is all over it! Some kids are making man-eating robots. Some kids are holding their breath for a very, very long time. Some kids are doing interesting things with vacuum cleaners. The theme, obviously, is global warming. But what should Ivy and Bean...