Have a snowball fight with catapults and ping pong balls! This winter STEM catapult challenge involves engineering, geometry, ratios, critical thinking, and teamwork in an engaging winter-themed activity your students will love! Updated to include digital STEM journals for distance learning! Using the engineering design process along with math skills, teams of students will build two catapult designs from common materials (popsicle sticks, rubber bands, newspapers, magazines, cans, and other rec