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Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

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

The moon doesn't produce its own light, so why can we see it shining in the sky? Learn about reflection and planetshine in this fun and easy science project!

Using a toy race car kids create a visual model of the Doppler Effect.

This science fair project idea examines whether plants are still able to grow normally if they are turned upside-down.

In this science fair project, students use the streak test to tell minerals apart from each other.

Kids will learn how to make a steam powered rocket boat, also called a putt putt boat or a pop pop boat, in this great science fair project for 4th graders.

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

When you cut a flower to put into a vase, it'll eventually wilt, even with water and sunshine. But is there another scientific secret to keeping flowers fresh?

In this science fair project, we'll use a liquid crystal thermometer to find out whether exercising makes a difference in people's temperature.

In this science fair project, we learn how air molecules move as a result of density, convection, and air currents.

Would it hurt to skip brushing your teeth just this once? Let's find out by seeing which foods produce the most mouth bacteria.

Have you ever wondered how many numbers most people can memorize? Test your friends to find out!

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

This science project lets students explore the number of spots on a ladybird and how to treat ladybugs with respect.

Do plants get crowded? Have your curious kid investigate how plants respond if they're forced to grow together in a confined space.

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

Learn how to tell time by the sun with this cool science fair project idea that tracks how the accuracy of a sundial changes over time.

Wiggly worms are known for staying buried in the soil, but how does that affect plants? Are earthworms and plant growth related?

How does the size of a vibrating surface affect the pitch of a drum? Learn about drum size and pitch with this easy science fair project idea.

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

Slime: It's oozy, it's goopy, and it's just plain fun! Learn how to make slime with this fun science fair project.

In this science fair project, kids measure how weather conditions affect how fast a puddle evaporates.

Word color association is just a fancy way to talk about the way we connect colors with words.

Will increasing the amount of salt in water effect how slow or fast the water freezes?

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

Do earthworms like moisture or darkness? Find out as we explore the relationship between earthworms and light.

Is it possible to trick the forces of nature that make your bubbles round to create a square bubble?

When you rub a balloon on your head, your hair stands up; but is that true for everyone? Does hair color affect static electricity?

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