Get your middle and early high school students engineering on the fly with this fun, hands-on STEM challenge! Students design, build, and test a zipline system to transport a secret message from point A to point B. Flexible materials and simple directions make it perfect for one class period, with all applicable NGSS standards covered. Includes:Student page with challenge rules, sketch space, and reflectionGreat tie-in to force, motion, and NGSS SEP 3NGSS Connection: SEP 3, SEP 6, MS-PS2-2, MS-E