Light is radiation in wavelengths composed of many colors that are visible to the eyes. These wavelengths can be separated. One way to separate colors is with a filter. Filters keep certain wavelengths out and allow other wavelengths to pass through. In this article, the authors discuss an activity to provide students the opportunity to build a science tool, use it to investigate a topic, and then apply their knowledge to produce a book to share with others. They provide an experience on color filtration with the use of secret messages and science goggles that greatly help second-grade students "see" what it is like to be a scientist. (Contains 6 figures and 2 resources.)