The 32 students in Professor Voth and Assistant Professor Moller’s sections of IDEAS 170 spent half the fall semester creating a device of their own design that would hop off the table, but only after a delay of at least eight seconds (and less than 60). Class periods were intense work sessions, as well as opportunities to bounce ideas off their professors and classmates, talk about what they think might work—and why it didn’t. Then, just before fall break, it was time for the big reveal. But will the hoppers perform? And in the allotted time period? And how high will a hopper hop?