In this activity, learners explore how wind energy can be generated on both a large and small scale. Learners design and build a working windmill out of everyday products and learn about anemometers and site testing. Learners' windmills must be able to sustain the wind generated by a fan or hairdryer at medium speed. Learners test the ability of their windmills to rotate and lift a small object upward. Learners evaluate the effectiveness of their windmill and those of other teams, and present their findings to the group.