Fun Kid Activity: Lines of Colored Tape, straws and pompoms. Try straws and cotton balls. Adding the lines ups the challenge. Using pompoms allows you to adjust the size from tiny to pretty big. The pompoms are also nicer looking.
STEAM / STEM : Rainbow Science for Kids: Homemade Spectroscope using a paper towel roll (cardboard tube) and a CD Such a fun way to children to explore the light spectrum!