On the last day of second grade, Song Lee's party at the local amusement park forces Harry to face his fear of elevators when he is expected to ride the Drop of Doom.

Learn the science behind the fun of amusement parks in this nonfiction Level 3 Ready-to-Read, part of a series about the science of fun stuff! Did you know that a rollercoaster does not need an engine or power source of its own? And how exactly does a bumper car go without gas?