Make a sundial to observe the movement of light throughout the day.
Make a really long working straw.
Create a marble maze with straws.
Use vibrations to make music.
Develop understanding of how animals survive, grow, and meet their needs in their environment.
Create a pair of sunglasses to protect your eyes from the sun.
Putting a box on your head can actually help you see.
Make it easy to view the phases of the moon in your house.
Communicate with a friend using sound waves.
Talk to your friends with a flashlight.