This project compares the strength of one, two, and three-ply toilet paper.

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

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

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.

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

Kids explore how a single movable pulley can confer a mechanical advantage over a fixed pulley in this cool engineering science fair project for 2nd grade.

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

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.

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

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

This science fair project idea investigates the ability of different whitening toothpastes to whiten teeth.

Watch pre-packaged seeds and seeds taken from inside fruits and vegetables grow. Which ones will grow faster? Read more in this science fair project idea.

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

Test whether plants can grow without sunlight and water.

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.

Have you ever seen fruit decay? Find out if a fruit will rot faster if you open it versus leaving it untouched!

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

Find out whether putting something on top of a plant will inhibit its growth.

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

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

This science project challenges students to study deer behavior in their natural habitat- the feeding patterns, social behaviors, male to female ratio, etc.

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.

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

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

Explore scientific concepts with this experiment that introduces kids to the scientific method!

This science project teaches students the relationship between compost and plant growth. Students conduct an experiment with different types of compost.

There are many benefits to bugs and insects. This science project shows how cockroaches, termites, and other critters benefit our planet.

What's the best way to make DIY compost? Kids will learn about aerobic and anaerobic decomposition while learning to appreciate the value of composting.

Do you think heat can affect a plant's growth rate?