Check out this science project idea to compare organic produce to non-organic produce and how preservatives in food extend the shelf life of goods.

In this fun experiment, we'll find out how color affects heat absorption!

How does distance affect the spreading of light? Kids see diffraction and the inverse square law of light in action with this great science fair project idea.

This science fair project creates a visual model of whatâs happening to sound waves as a car approaches and then leaves.

This science fair project teaches students about wilting and browning of salad greens.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

In this experiment, students will create their own version of coquina, a sedimentary rock thatâs formed by seashells and sand, cemented by seawater minerals.

Get down to the rubber with this science project that tests the effectiveness of different types of erasers.

What do ants eat? Kids find out by observing a colony of ants in this cool zoology science fair project for 4th grade.

In this microwave plant experiment, find out whether microwave radiation will affect radish seed germination. Will it help or hinder the plants' growth?

Kids learn how to manipulate additive and subtractive colors to send secret messages with red colored filters in this cool science fair project idea.

Cinnamon is tasty, but does it have super powers as well? Find out if cinnamon can repel mosquitoes in this outdoorsy experiment.

The objective of this science project is to determine the length of time for different seeds to germinate.

This science project uses Mohsâ Hardness Test to show kids how to compare the hardness of different types of minerals.

What are the benefits of good posture? Kids will learn about the cognitive effects of good posture through conducting and observing a controlled experiment.

This science fair project idea creates a sedimentary rock and to investigate what takes place during the rock cycle.

What's the science behind those out-of-sight roots? Find out if you can trick roots into growing in different directions.

Show your preschooler how to make a print of a butterfly using her hand as a tool--a great way to stimulate her sense of touch.

This science fair project idea demonstrates how air resistance contributes to denser objects falling faster than less dense objects.

The purpose of this science fair project is to explore whether UV light passes through some colors and not others by looking at blue, red, purple, and clear.

In this science fair project, students focus sunlight with a magnifying glass and trap shorter waves to melt ice.

In this simple science project, learn about what causes dew and what affects dew formation with a drinking glass, ice, and a soda bottle.

Kids learn about examples of mechanical weathering and conduct an experiment with seeds and plaster in this cool geology science fair project idea.

Magnets vary in strength. Have your young scientist figure out which kind of magnet is the strongest when you have him conduct this attractive experiment.

In this cool science experiment, learn about magnetism and poles, and test magnet strength to find out if two magnets are twice as strong as one.

Does your middle school teenager have good reflexes? Gauge his reaction time in this science and math activity that requires only a yardstick and a friend.

Take a dive into the candy jar with this yummy science experiment.

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

Science fair project which determines whether plants are able to get enough nutrients from different types of garbage.

Check out this cool science fair project on identifying rocks and minerals for kids.