Use reusable, recyclable materials--along with a dose of imagination--to build a castle with first grade geometrical forms.

This science project uses Mohsâ Hardness Test to show kids how to compare the hardness of different types of minerals.

This experiment explores how microwave radiation affects fungi, bacteria, and plant life.

Administer IQ tests to volunteers. have one group practice typical IQ test problems. Then compare results of the two groups.

Is there a relationship between caffeine and heart rate? Students will determine the effect of caffeine on heart rate in this fun science fair project.

Kids build a rainforest food web to explore trophic levels in this cool science fair project for 4th grade.

Give your science savvy kindergarten a lesson in plant science with this fun carnation experiment.

Use simple items to create a kindergarten "grow box" that lets a kid see just how salad plants send down their roots and grow underground.

Discover which fabrics shrink the most in the wash and why.

Your kindergartener will have a blast helping you craft these fun, eco-friendly potted place cards.

Here's a science experiment that gives your kids a chance to see how fire needs oxygen to burn, with a little math and writing practice thrown in.

This project will explore whether music influences physical endurance.

This experiment evaluates whether the phenomenon of "choice blindness" occurs more often with men or women.

In this experiment you observe and determine how well your cat uses his whiskers to navigate through a maze.

Inspire your child to put on her engineer hat for the day, as she builds her very own, double-decker bridge.

Get your sense of humor ready for this fun science experiment that demonstrates the fundamental physics of air pressure.

This experiment will explore how mallets of various materials and weight create sonic tones of varying lengths.

This science fair project challenges students to research vortices occurring in nature and then create their own vortex.

Learn how to make a hygrometer to measure relative humidity in this project. Make a sling psychrometer hygrometer with gauze, thermometers, and a bottle.

This science fair project idea determines whether the hand a person writes with relates to which side they will choose from in a fake taste test.

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.

Help your second grade scientist explore the timely topic of wind speed using a version of the classic Beaufort Scale.

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

Do plants get crowded? Have your curious kid investigate how plants respond if they're forced to grow together in a confined space.

Is it a square or a circle? See if you can trick your friends with this zany science project!

Science fair project that demonstrates the different phases of the moon by physically representing them with construction paper and a shoebox

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

Determine the effect of reading aloud on memory skills. Prepare a list of randomly chosen words, ask volunteers to recall as many as possible from the list.

In this science fair project, kids observe the expansion of liquids when frozen and determine if some liquids expand more than others in the freezing process.