š Looking for more than a basic STEM challenge? This Earth Day unit takes students beyond buildingāstudents design, test, AND turn their invention into a business! Students become entrepreneurs! Engage your students in a meaningful, real-world STEM challenge inspired by the powerful story One Plastic Bag! Students will design, build, test, and improve a product using recycled plastic bagsāthen take it one step further by turning their invention into a business. This is more than a STEM activ