What do worms eat? Kids find out what kinds of rotting leaves and vegetables worms prefer in this cool compost science fair project.

Science fair project which measures the shadow cast by a meter stick at various times in order to predict the circumference of the earth.

This science experiment tests if dog saliva can really help heal wounds.

This science fair project determines what effect substances have on ice, and which of these products most effectively melts ice.

Science fair project that compares the relative carbon dioxide concentrations of various gases, including different types of vehicle emissions.

Determine which factors promote the greatest memory interference. Administer test, time how long it takes subjects to complete different tasks.

Investigate the advantages of the use of ceramics in engines such as the tiles used in Space Shuttle. Use iron filings and magnets.

The objective of this science project is to determine the length of time for different seeds to germinate.

Science fair project in which you will create your electricity by making a homemade battery using salt water, a nail, and a copper wire.

This science fair project idea determines which brand of batteries have the longest life.

Use this fun activity to make an optical illusion picture that helps your kindergartener explore the sense of sight, and sharpen his observation skills!

Help your child experiment with the combination of acid and baking soda by making these homemade bath bombs!

Science fair project idea examines different techniques for memorization. Analyze results of memory tests to determine which method is most effective.

This science fair project explores how salt and sugar affect the melting rate of ice in water.

Brighten up your home with this fun activity! Make a summer sun print and teach your child the art of easy print making.

This experiment explores whether reading text on a computer screen or type on paper leads to better retention of the information read.

Ant behavior is closely related to light intensity. This free science fair project idea examines how fast ants dig when they are exposed to to light and dark.

This science fair project idea studies whether eating a hearty breakfast before and exam will get them better test scores.

Does your middle school teenager have good reflexes? Gauge his reaction time in this science and math activity that requires only a yardstick and a friend.

In this activity, students will create a stop motion animation by creating a clay figure and taking a series of digital photographs.

Show your teen how to make her own beeswax lip balm. It's one of the simplest do-it-yourself activities, and it's fun to make!

Make stunning pendulum waves and learn the math behind the patterns generated with this cool and easy science project.

Play Rock Tic-Tac-Toe, the perfect outdoor game for all ages. Help your child develop thinking skills and get away from the TV!

This science fair project idea investigates how optical distances change the apparent size of an object as seen through a magnifying lens.

This weather spinner will improve observation skills by encouraging children to examine and track weather details and patterns.

Try this experiment to give your curious kid a more "solid" understanding of how temperature affects the states of matter.

What is a compound microscope? Kids find out by making one of their own in this cool science fair project.

Slip some science into storm watching with a homemade rain gauge!

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

Grow potatoes in a plastic bag—easy to grow and harvest, and yummy to eat!