STEM Challenge: This challenge uses index cards- any size you want and each group gets only 12. This is an amazing and simple challenge and would be perfect at the beginning of your school year- without breaking your budget! This is a perfect challenge for your elementary students for the start of school- using only one easy material. KIds love this and you will love watching them make a chain from only paper! This blog post will tell you more! #STEM #backtoschool