This educated-guessing game is great for preschoolers. This activity helps your child work on her reasoning skills.

Enjoy those warm spring and summer nights with your child while teaching some basic astronomy at the same time.

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

Would your child like to learn about a hidden world? All she needs to do is open her box of markers!

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

In this CD hovercraft science project, students will construct their own DIY hovercraft.

How do you tell time without a watch? Use the sun! This simple activity will show your child how to build his own sundial.

This science fair project idea produces sounds by creating vibrations using different objects.

Hatch a praying mantis egg case in a homemade habitat with your child's help! This is an amazing experiment in science and nature for kids of any age.

Want to spark your third grader's interest in gardening? Help him make popsicle stick fairies to decorate an enchanting garden oasis.

Check out this fun science fair project to make a vinegar and baking soda balloon and demonstrate how gas is created as a result of the chemical reaction.

On the next chilly, winter day, invite your fifth grader to make a hand warmer by experimenting with the loaded combination of a few natural ingredients.

Show your child how to construct a homemade thermometer. It's hands-on fun and a great way to learn about this important instrument!

Got a birdwatcher on your hands? Bring the birds to your backyard by making a zany bird feeder using an orange and some string.

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

Your second grader will love this simple soda bottle race car activity. Make a ramp and customize your car for an entertaining way to learn scientific concepts.

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

In this experiment, students find out what happens when a less-dense fluid interacts with a denser one, replicating the effect of cooler solid rock on magma.

Make a wish upon a tree with this craft that also helps your child learn more about Chinese culture.

Do plants breathe? Not exactly. They do respire though! This activity will help your child with see that plants are producing the oxygen we need to survive.

This science fair project idea highlights decomposition rates by comparing how long it takes an item to decompose in a compost pile vs. a landfill.

This homemade barometer allows your little scientist to contemplate and compare different air and weather conditions.

Your kid can learn about the process of making frozen yogurt and enjoy a homemade, flavorful dessert. Experiment with this fun, chilly food!

Determine whether butterflies like to drink sugar water, salt water, or plain water.

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

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

Science fair project that examines the different types of precipitation, evaluates the density of snow and calculates the ratio of snow-to-liquid.

Learn whether writing things down really makes things easier to remember.

In this activity, children will let their imagination run wild as they design and build a new planet in the solar system.

Science fair project that determines whether tapping a pomegranate with a spoon helps it release its seeds.