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

Make water and clay play a little more scientific with this hands-on experiment that teaches displacement and shows how an object's shape affects its buoyancy.

This science fair project idea examines whether the colors of the spectrum respond differently in the thermal aspect when radiated by the sun.

This science fair project idea explores whether talking to a plant will help it grow.

This light bulb science project includes step-by-step instructions for testing the heat from different light bulbs.

This science fair project idea examines how well individuals can remember a story they were told and how accurately they pass that story along.

Science fair project that examines how winter storms form and the relationship between temperature, moisture and snow.

Incorporate some math and science thinking into your annual fall fun with this pumpkin investigation activity! Your child will have a blast investigating various ways of measuring pumpkins, making estimates, taking measurements, and recording their findin

In this activity, your child will be challenged to make a tower using paper cups.

The objective of this science fair project is to test the growth rate of a plan in a crystal medium in comparison to traditional soil.

Would your dog prefer homemade or store-bought food? Raw or cooked? Test your dog's preferred diet in this fun experiment.

Take a nature walk in your backyard or local park to find one object for every letter of the alphabet. Then put them together in this handy nature book.

Use chemical analysis to identify a variety of mystery powders that look the same but actually have very different properties.

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.

In this science and engineering activity, children will explore types of tunnels and their purposes and then design and build a tunnel of their own.

Science fair project that compares the ecology of different soil samples by identifying which sample has the most invertebrates living in it.

Do you have your isopods straight? Learn about sow bug and pill bug behavior by building a terrarium to study them in!

In this activity, your child will be asked to create a boat that can successfully float while holding 25 pennies.

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

Combine your child's natural curiosity with his developing classification and writing skills by helping him create a backyard field guide.

Science fair project in which you will attempt to throw a ball the greatest horizontal distance possible by using different angles.

In this activity, your child will transform an egg into a glowing, bouncy "ball" that they can play with.

Can a toy car determine the strength of a magnet? In this cool magnet science fair project, young scientists will learn how to measure the strength of a magnet.