Science fair project that determines whether lettuce that is harvested gradually yields more produce than lettuce that is harvested all at once.

Have your kid determine if a goldfish can be conditioned to expect food the same way Pavlov's dogs did with this fascinating science fair project.

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

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

In this activity, your child will make her own "quicksand" to better understand how a substance can be both fluid and solid at the same time.

This science fair project examines which fruits and/or vegetables will ripen prematurely when placed with ripe apples.

Learn all about balance and motion as your child designs a corn maze!

The goal of this evaporation experiment is to learn about how different external conditions affect drying time.

It's not actually that hard to get energy from garbage! Kids learn how to make biogas in the form of methane with this cool and easy science fair project idea.

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.

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.

Deck the halls with last season's Christmas lights for a spectacular and electrifying science activity.

Children will learn all about cause and effect as they experiment with potion-making in this Halloween themed activity.

Learn how to make marbleized paper with simple everyday ingredients in this fun activity! Your child will learn about oil and water while doing this project.

In this plant habitats activity, children play the role of an ecologist and take surveys of different areas to discover the best habitat for dandelions.

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

In this outdoor science activity you'll find tips on how to create a nature journal by choosing a native plant or animal and tracking that species.

In this science fair project, learn how to make gears and find out why they transmit torques in predictable ways.

Your fourth grader will be astonished to discover the significance and intricacies of his spine as he builds a model of a human vertebral column.

The objective of this science fair project idea is to determine if sound travels best through the air, water or a solid.

In this experiment, students find out what happens when a less-dense fluid interacts with a denser one, replicating the effect of cooler solid rock on magma.

This science fair project idea determines what household items are good conductors of electricity.

In this science fair project, students create their own miniature salt flats at home.

Examine whether distilled water, spring water, or regular tap water yield faster plant growth.

This science fair project idea explores how the shape of a boat affects its density and how much weight it can float.

Discover whether different amounts of water added into a wine glass will produce a different pitch when their fingers are rubbed along the rim.

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.

What happens when eyes see something that the brain knows cannot be true? In this science activity, the brain has to "fudge" it when interpreting what you see.

Science fair project examining barometric pressure, and how it can be used to predict the weather. How does atmospheric pressures relate to weather conditions?

This project examines whether playing music during class helps students learn or if it distracts students from learning.