In this science fair projects, students will grow out the bacteria that collect on air conditioner filters.

How does a flashlight work? Kids will make a complete circuit and explore how voltage contributes to brightness with this science fair project idea.

Is it magic? No...it's the amazing, gravity-defying capillary action experiment! Kids will love this dramatic and enlightening science fair project.

Put your second grade scientist to work this Fourth of July with our colorful "liquid fireworks" project!

Here's a classic celery science experiment that uses celery and food coloring to demonstrate how plants absorb water.

In this exciting and empowering challenge, your child will construct a bridge using marshmallows and toothpicks!

This science fair project idea explores if the length of the string that an object is suspended on has an effect on how fast or slow it swings.

This science fair project idea investigates emulsifiers that allow oil and vinegar to mix.

How do animals keep warm? In this experiment, find out whether fat insulation resists cold temperatures and learn how this works in the animal kingdom.

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

Try the classic balloon-on-the-wall trick with your kid and watch static electricity in action.

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

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.

Science fair project idea that examines different physical characteristics of a chosen animal. Make educated guesses about evolution based on animal's form.

Create a brush pile to help wintering wildlife stay warm and cozy through the winter.

Explore aromas with your child and help boost her brain power with some fun and interactive science activities.

Set your young chemist up for an afternoon of science-fueled magic with a deceptively simple activity starring baking soda and vinegar!

This trick uses vertical and horizontal forces to help your child to push apart your hands apart, no matter how hard you try to keep them together!

This science fair project will help students learn about non-vascular plants, such as mosses.

Learn about this simple machine and make a pulley of your own to use for fun science trials.

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

This activity provides a solution to all those leaves on your doorstep, while also giving your child a fun science lesson.

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

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.

Cleaning can be a chore, but not with this sudsy experiment!

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

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

Engineers in training can get started with this simple wheel-and-axle construction activity.

Kids will make predictions about cricket behavior by conducting this fun and easy experiment which simulates different environments for crickets.

Your kid will be captivated as she watches liquids change color before her very eyes during this fun science project that introduces some chemistry basics.