How old are your ears?
This video clip (1:37 mins) explains how ears hear sound. Included is a basic test relating hearing ability to age. This is ideal as a homework task with students set the task of watching the video and determining if their hearing is appropriate for their age. The length of time each student spends plugged into ear-plug music could also be compared to determine if there is an association. This is also useful to explain the difference between cause and association in initial experiments.
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