This activity (8th activity on the page) tests learners' ability to identify things using only the sense of hearing. A blindfolded learner listens as another learner approaches him holding a ticking watch from different angles. Learners will record the distance it takes for the learner to hear the ticking sound. Learners will also examine how covering one or both of the ears affects their ability to hear. This activity page includes a link to background information about the ear and hearing.