To celebrate its 20th anniversary, Scholastic is re-releasing the ten original Magic School Bus titles in paperback. With updated scientific information, the bestselling science series ever is back The classic title that started the award-winning seriesJoin Ms. Frizzle and her students as they follow the trail of water, from its sky-high source to the school bathroom sink on this wet and wild fieldtrip. After parking the school bus on a cloud and shrinking to raindrop size, Ms. Frizzle's class gets to see the waterworks from the water's point of view.