This science fair project idea experiments with spinning color wheels and optical illusions.

Does putting soapy water on plants help or hinder plant growth? Kids learn about greywater and how it affects plant growth in this cool science fair project.

Sink or swim? Calculate the density of various fruits and vegetables using water and a kitchen scale.

Brine shrimp usually live in saltwater. Investigate how salt concentration (salinity) affects the rate at which brine shrimp eggs hatch.