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

This science fair project idea investigates whether plants can survive being frozen.

Find out whether packaged seeds actually do expire in this new science fair project idea.

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

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

This science fair project idea discovers if an artificial light source will yield the same plant health and growth rates as light from the sun.

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.

How do organic materials become soil? This science experiment measures what materials biodegrade.

This science research project challenges students to think of more effective lobster farming methods.

How well can people recall what they have observed. Test your knowledge in this fun experiment.

The objective of this science fair project is to set up a compost bin to convert food scraps and organic waste.

This science fair project idea examines whether adding gelatin causes a solid to have a higher melting point and/or melt slower.

This project explores whether plants can live and grow when "watered" with juice, soda, or milk.

Demonstrate how to tell the age of an egg without having to crack it open.

Does skin thickness really decrease fruit spoilage? Find out in this science fair project idea!

Determine whether butterflies like to drink sugar water, salt water, or plain water.

This project uses science and art to help students learn and teach others about Earth's endangered and extinct species.

Young scientists will investigate people's preferences for saltiness, and make some inferences about genetics and diet.

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

What can you do with hair after its cut? This science project teaches you practical uses for human hair.

Water, along with soil and light, is a necessary component for plant growth. So what's better for promoting plant growth: tap water, or rain water?

Do you love to make Jell-O? Find out in this science fair project idea if it is possible to make Jell-O with just warm water.

Examine the effect of pressure on carbonation in soda.

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

Science fair project which determines whether the size or the thickness of a piece of paper has an effect on how many times it can be folded in half.

Science fair project which will teach you more about the foods that you eat, and learn which ones are healthier choices.

This science fair project idea determines if the temperature of rubber effects how high it bounces.

This science project allows students to study the psychology of happiness.

Check out this fun and easy science fair project idea on germination of a seed and learn to identify exterior and interior parts of a bean seed.