Sink or swim? Calculate the density of various fruits and vegetables using water and a kitchen scale.

This science fair project idea experiments with spinning color wheels and optical illusions.

This science fair project idea examines the distance a person travels on an average day and to relate that to an understanding of the size of the Earth.

This science experiment tests why guacamole goes brown and if leaving the pit in will stop guacamole from turning brown.

Alive or not? This yeast experiment you can conduct with your little scientist explores the answer to this timeless question.

Kids conduct a simple birdseed experiment to figure out what kinds of birds live nearby in this fun science activity.

This activity is a fun challenge for students who have just started learning to program educational robots.

Help your second grader observe the phases of the moon, and then let the fun loose: he'll get to chart his observations with marshmallows!

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.

Is it possible to trick the forces of nature that make your bubbles round to create a square bubble?

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

What is persistence of vision? With this hands-on science fair project idea, students will demonstrate this cool and dramatic phenomenon in their own classroom.

Can you plant the insect-attracting borage plant to increase the amount of beneficial insects in your garden? Find out in this experiment!

Are you ready to be a detective for science? Then get out your magnifying glass and start studying fingerprints!

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

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

By incorporating natural materials and the powers of observation, your child will become a backyard naturalist while building early writing and drawing skills!

This science fair project idea identifies trees using a dichotomous key.

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.

Young physicists will wrestle with a discrepant event: the Hammer Ruler Trick. They'll make some inferences about torque, balance, and center of gravity.

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.

Take a dive into the candy jar with this yummy science experiment.

In this activity, your child will be challenged to use simple materials to create a catapult for a small, lightweight toy.

What is mulch? Kids will provide soil with a wet blanket of mulch and see if that helps keep drought-stricken soil damp.

This science fair project idea explores whether there is a connection to the color a person wears and the way their emotional state is perceived by others.

Science fair project in which you will start a fire from scratch without using matches or a lighter.

This science fair project focuses on the use of the enzyme amylase found in human saliva to break down starch into sugar.

This science project challenges students to learn about and classify weeds and discover new practical uses for weeds.

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

This play-activity causes young children to focus on and become more aware of their sense of hearing and the power of their ears.