Ivy and Bean What's the Big Idea? Book 7 by Annie Barrows

The adventures of Ivy and Bean continue in paperback the seventh installment from series creators Annie Barrows and Sophie Blackall. 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 do? Something involving explosions? Or ropes? Something with ice cubes? Or maybe...maybe something different.