Flexes its muscles: Ms. Frizzle's class tries to build a robot to do their chores by studying how the human body works. The robot has problems and they learn how complex the human body really is. Taking flight: Ms. Frizzle and her clas shrink down to fly in a radio-controlled airplane as they study the principles of flight. The busasaurus: Ms. Frizzle takes the class to a dinosaur dig. She completes this field trip by traveling back 67 million years to see what ancient reptiles were really like.