In this Groundhog Day themed STEM challenge, students figure out multiple ways to pop a "groundhog" up out of his "burrow," and then they must accurately measure his shadow using centimeters. This activity challenges students to call on most of the Standards of Mathematical Practices, as well as to write clearly for a specific purpose. It puts accurate measurement and data recording into real-life practice. Groundhog Day is an opportunity to discuss hibernation, seasons, and folklore. Here's