Find out whether a longer airplane will fly farther or a wider paper airplane.

Kids learn how to prevent erosion by growing grass. They'll test soil with grass against raw soil in this revealing science fair project idea for 4th grade.

This project demonstrates the correspondence between the volume of water displaced by a submerged object and the volume of the object displacing it.

Science fair project that examines how to grow bacteria in a controlled setting, using simple materials from around the home.

How do animals keep warm? In this experiment, find out whether fat insulation resists cold temperatures and learn how this works in the animal kingdom.

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

In this enlightening transpiration experiment, kids will explore how the loss of water from plants through transpiration contributes to the water cycle.

This science fair project idea determines if the color of light affects the growth of plants.

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 experiment, young ecologists will learn about a type of edge effect: how trees and plants at the edge of a forest can act as a weed filter.

Build a 3d animal cell model with this cool science fair project, which helps kids visualize and understand the function of a cell's parts and organelles.

In this science fair project, we'll use a liquid crystal thermometer to find out whether exercising makes a difference in people's temperature.

This science fair project idea explores the egg's thin membrane.

Examine the effect of pressure on carbonation in soda.

Kids will learn how to make a thermometer to to explore liquid density in this great science fair project. Which liquids are affected by temperature the most?

This science fair project idea explores plant growth from a bulb, root, and a stem and investigates asexual plant reproduction.

This science fair project idea investigates the difference in reaction times between boys and girls.

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.

This simple heat transfer experiment is a great introduction to the concepts of heat transfer and conduction.

Have your child kick off their summer vacation by making a miniature water slide!

Kids discover what a homogeneous mixture is by adding sugar to distilled water and identify the various factors affecting solubility.

In this experiment you explore how tectonic plates move to create land and expand bodies of water.

This science fair project idea investigates the hardness property of minerals.

How does water pressure change with depth? Kids learn how pressure works underwater with this cool and easy demo.

In this cool science fair project idea, kids conduct the ruler drop test on volunteers to determine whether reaction time can be improved with practice.

What is elasticity? Students will investigate how this concept applies to bouncing ball physics by testing the bounces of balls made out of different materials.

This science fair project idea examines whether plants are still able to grow normally if they are turned upside-down.

Collect meteorite dust with a magnet in your very own backyard! The objective of this science fair project is to gather meteorite dust to study outer space.

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.

This is a quick, easy science fair project that conveys the idea of density to preschool and early elementary children.