Looking for low prep STEM activities that don't break the bank? These popsicle stick challenges are IT! Catapults are great to inspire a competitive edge, and the bridge STEM challenge offers high engagement. There is a HUGE wow factor with the exploding craft stick activity too!Use these challenges for: Early finishers STEM centers or science stations STEM Fridays, Maker Mondays, or Tinker Tuesdays STEM sub plans or a sub tub. The directions and materials are easy to set up and straightforward