In this science fair project, apply the principles of leverage and force by building six simple machines designed to set weights in motion.

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

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.

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.

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.

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

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

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

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

This science fair project teaches kids experimental design and how to test if subjects can really sense if they are being watched.

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.

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

In this project students experiment with making music using only glasses of water.

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

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

This science fair project idea determines the most effective method of preserving food.

This science project encourages students to investigate the Mozart Effect, the idea that classical music promotes learning.

Plants and light seem to be good buddies, but how far does the friendship really go?

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

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

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

In this project children practice the scientific method while playing with puffy paint.

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

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

Test whether plants can grow without sunlight and water.

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.

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

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

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