The Magic School Bus - Shows and Tells - Ep. 32

The class is on the international Show and Tell game show, in which one person shows and the other tells. Arnold will bring his rock collection and Dorothy Ann will be doing the "tell" part. However, he arrives without it. He had found a strange object, which he thinks would work much better, but nobody even knows what it is. Ms. Frizzle then takes the class on field trip to find out. She turns the bus into Suppose-O-Tron that can test their hypothesis.