When Rosie is unable to invent a contraption to help one of Aunt Rose's Raucous Riveters friends, she calls on classmates Iggy Peck and Ada Twist to help.

When pets go missing in Blue River Creek it is up to Ada to follow the scientific method by making a hypothesis, collecting data, and experimenting to find the missing animals.

"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?"--

When Zookeeper Fred's green snake Vern gets loose in the zoo, the Questioneers need all their talents to help find him, but in the end, it is Aaron's art that leads the way. Includes facts about snakes.

Ever since he was a baby, Iggy Peck has built towers, bridges, and buildings, which comes in handy when his second grade class is stranded on an island during a picnic.

When her abuelo is injured at the local landfill, second-grader Sofia is determined to transform the dangerous Mount Trashmore into a park, taking on City Hall in the process.