In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

This science fair project idea explores substances that cause a bubble to last longer.

Get down to the rubber with this science project that tests the effectiveness of different types of erasers.

Did you know your body is full of simple machines? This project looks at one of the third-class levers in the human body: your arm!

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

Test your friends to find out if you can replicate the placebo effect's incredible results.

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 do ants eat? Kids find out by observing a colony of ants in this cool zoology science fair project for 4th grade.

The purpose of this science fair project is to explore whether UV light passes through some colors and not others by looking at blue, red, purple, and clear.

The objective of this science fair project is to observe the differences in heat absorption for darker colors vs. lighter colors.

This easy and inexpensive paper towel science project introduces kids to important physical concepts like cohesion, adhesion, and capillarity.

This biodiversity project examines the biodiversity in your own backyard.

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

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

This science fair project investigates whether tapping the top or the side of the can will stop a vigorously-shaken can of soda from exploding.

In this project, build an insect model that shows how the head, thorax, and abdomen fit together! Learn insect anatomy by constructing a paper mache critter.

In this simple circular motion experiment, you'll observe tangential velocity and learn about how acceleration and centripetal force affect an object.

How does smell affect taste? Ready your taste buds--in this project, you'll gather some test subjects and do a taste test to see how much smell affects taste.

Why does honey crystallize? This science fair project project answers this question and identifies the variable that makes this sweet solute crystallize faster.

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.

In this activity your child will create their very own marble maze!

How do icicles form and what do they look like? Do this free science fair project and watch the formation of icicles occur right before your eyes.

In this project combining nature, art, math, and science, children make rubbings of leaves then observe shapes and structures and sort the leaf images.

This science fair project idea investigates how color affects temperature.

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 physics project, learn about the relationship between light intensity and distance using a laser pointer, flashlight, and graph paper!

Start your toy engines -- this is going to be a fast and friction-filled race!

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

Will potatoes spud or sprout faster in dry, dark, or cold conditions? Find out in this science fair project idea!

How does salinity affect the point at which water freezes? Kids will find out by performing this cool melting ice experiment.