Who hasn’t been enjoying a hot beverage just to burn your tongue while 
taking a drink? Most, if not all students, should be able to relate to this from previous real life experience. I found this “Joulies” activity from a list of Dan Meyer’s 3-Act math projects. In this project, students will be analyzing the relationship between the cooling temperatures of hot beverages, with and without the advertised product “Joulies”. Students will do so by using temperature probes to record both of the cooling temperatures graphically. Joulies are advertised as being able to cool a hot beverage such as coffee or tea to a perfect drinking temperature three times faster while also staying warmer twice as long, through the activity students will be able to determine the validity of this advertisement.
The temperature probes are a Vernier product (http://www.vernier.com) and 
with the Vernier Easy Data App & Easy Link USB Interface it makes it very easy to use TI-84 plus calculators to hook our temperature probes up and record desired data. In the lesson plan and activity attached, you will read how this technology is involved in helping students achieve the common core state standard:
CCSS.MATH.CONTENT.8.F.B.5
Describe qualitatively the functional relationship between two quantities by analyzing a graph (e.g., where the function is increasing or decreasing, linear or nonlinear). Sketch a graph that exhibits the qualitative features of a function that has been described verbally.
