Get a stopwatch and hold it close to a classmate's ear.
Then move it out from theear until your partner can no longer hear the sound.
Measure and record this distance.
Repeat for the other ear.
Is the distance the same?
Watch your favorite TV show with the sound off.
How much of the plot or dialogue did you understand?
What did you find yourself paying attention to that you might not have noticed normally?
Bats and dolphins use ultrasonic sound waves to "see" with sound.
Conduct research on how they navigate and sense the world by echo.
Find out how insects, birds, reptiles, and fish hear.
Do they have ears?
What kind of ossicles do they have?