This science fair project idea explores how the shape of a boat affects its density and how much weight it can float.

How can we describe the relationship of magnetic field strength vs. distance? Kids will find out with this free science fair project idea.

Spiders don't go to grocery stores or fast food chains to get their food -- they set up traps and wait for their food to come to them!

In this free science fair project, build a star clock and learn how to tell time on a clear night by observing the big dipper!

This science fair project idea determines if crystals will absorb food dye and if colors will mix by the process of diffusion.

How does dishwashing liquid work? Kids discover the chemical mechanism behind cleansing power in this easy science fair project idea.

What makes your shadow dance around all day? Let's play detective and find out why that sneaky shadow never stays in one place for long.

Take a closer look at your furry friend (or the furry friend of a neighbor -- with permission) to discover if communication exists between cats and humans.

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.

This science fair project teaches students about wilting and browning of salad greens.

Do different types of oil mix or stack? Find out in this science fair project idea!

Discover flight initiation distance as you play around in the park with this fun bird watching project!

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

This science fair idea is a great way for kids to explore static electricity. Kids will give a comb a static charge and watch as it separates pepper from salt.

This science fair project idea demonstrates that plants give off water.

This experiment challenges students to forecast the weather based on the surrounding areas' weather.

Test whether plants can grow without sunlight and water.

This simple heat transfer experiment is a great introduction to the concepts of heat transfer and conduction.

Crayons aren't just good for creating colorful masterpieces -- they're also great for science!

Gather some friends for a bubbly soda taste test do determine calories' role in your favorite drinks.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

Discover whether cold or hot water from the faucet will boil faster on the stove.

This science fair project idea investigates the difference in reaction times between boys and girls.

This biodiversity project examines the biodiversity in your own backyard.

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

This science fair project idea explores whether the process used to dry the beans we eat for food renders them unviable.

People have favorite flavors, but what about ants? Which ant food is the most popular?

In this project, learn about animal vision and different kinds of eyes: ocelli, compound eyes, and camera eyes. Find out what a jellyfish or grasshopper sees!

Science fair project that examines condensation and the conditions needed in order for dew to form.

In this classic Ivory soap experiment, kids learn what happens to different types of soap in the microwave, and why!