Make a phone.
In science we have been learning that sound is made when an object vibrates. These vibrations travel through the air and other media as waves until they reach the outer ear.
Have a go at making a paper cup phone to show this happening. You will need two paper cups, some inelastic string or fishing wire and two paper clips. Make a hole in the base of each cup, thread through the string and tie a paper clip inside the cup to prevent the string from detaching. Pull the string taut and have one person speak into one of the cups while you listen through the other. The cups can be used to communicate over distances of up to 30m. The paper cup phone works by transmitting sound vibrations along a tightly-pulled string.