The , Whirligig also known as a BuzzSaw, is a toy that makes a buzzing noise when it is spun. Print one whirligig and two buzzsaw sticks. Thread the two strings through the center holes of the whirligig. Secure the ends of both strings to the buzzsaw sticks. Wind up both strings and then pull the sticks apart. See the following pdf for more instructions.http://sparklab.si.edu/downloads/sparklab-whirligig.pdf