This free card is a sample from the 20-card STEM Challenge Card set by The Maker Classroom. Students use 20 sticks of dry spaghetti, one marshmallow, tape, and string to build the tallest freestanding tower they can in 18 minutes, with the marshmallow on top. It sounds simple, but it isn't. This download includes one challenge card front and one teacher notes page with materials list, time, group size, learning objectives, and a classroom-tested teacher tip. Recommended for grades 4–8. Works wel