Do your students love STEM engineering? This STEM Challenge Bundle for Middle School Science Addresses all middle school Engineering Standards. Students will love these engineering challenges while learning about the design process, criteria, constraints, and other STEM Ideas. A Balloon Car, flashlight, ball launcher, and more are included. Purchase the STEM bundle and save 20%. This STEM Engineering Bundle Includes:Criteria and ConstraintsBalloon Car: The Design ProcessBuild a ThermosBuild a Fl