The Next Generation Science Standards ("NGSS") were developed by teachers, scientists, and leaders in science and science education from around the country and are endorsed by the National Science Teachers Association (NSTA), a partner in the development of the "NGSS." This article presents an example of how to modify a lab to align with the "NGSS." What was previously a one-day cookbook lab became an extensive three- to four-day mini-unit that involved students in figuring out the second law of thermodynamics. Such changes address the intention of the "NGSS" to not only increase student achievement but also provide a better understanding of the nature of science. With adjustments, many current lesson plans can be transformed into a much more sophisticated set of lessons the authors call an "NGSS" mini-unit.