Joanna Cole

In the time of dinosaurs: When Ms. Frizzle takes her class to a dinosaur dig to look for Maiasaura nests, the Magic School Bus turns into a time machine and transports them back into prehistoric times--when dinosaurs roamed the Earth. Inside the human body: When the school bus, Ms. Frizzle, and the entire class magically shrink and accidentally enter Arnold's mouth, the ensuing anatomical adventure proves educational as well as exciting.

A special field trip on the magic school bus allows Ms. Frizzle's class to get a first-hand look at major parts of the human body and how they work.