This paper discusses the concept of scaling and its biological and engineering applications. Scaling, in a scientific context, means proportional adjustment of the dimensions of an object so that the adjusted and original objects have similar shapes yet different dimensions. The paper provides an example of a hands-on, minds-on activity on scaling that can be adapted to a middle school, high school, or even undergraduate science curriculum. The student activity is preceded by an introduction and followed by a summary discussion with possible suggestions on how a teacher might guide student exploration. (Contains 3 figures and 2 tables.)