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

This science fair project idea investigates how the shape of an object affects drag.

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

Magnets vary in strength. Have your young scientist figure out which kind of magnet is the strongest when you have him conduct this attractive experiment.

This science experiment has students test whether a snail moves faster on concrete or dirt.

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

This easy aerodynamics activity is a simple way to introduce kids to the scientific method.

Kids will learn how to measure the viscosity of liquids by making their own homemade viscometer in this great science fair project idea.

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

Here's a fun math and science activity: help your child explore four different kinds of measurement, using their hand and a few simple household tools.

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

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

Create a soda bottle garden that defies gravity! This hanging terrarium is housed in a soda bottle and perfect for crafty kids with a growing green thumb.

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

This science project teaches young students about germs, bacteria, and the importance of washing their hands. Students will test what is the best way to wash.

In this experiment, students will create their own version of coquina, a sedimentary rock thatâs formed by seashells and sand, cemented by seawater minerals.

This project explores whether nails, toothpicks, straws, or pen nibs are best for applying ink to paper.

This science fair project idea demonstrates that light travels in straight lines and experiments with reflecting light.

This science fair project idea determines which method of hand cleansing is the most effective.