Construct and experiment with a periscope using reflected light rays to gather an image.

Kids often ask, "how tall am I?" This science fair project seeks to determine how well kids can guess their own heights.

Gather some friends for a bubbly soda taste test do determine calories' role in your favorite drinks.

Is there a relationship between caffeine and heart rate? Students will determine the effect of caffeine on heart rate in this fun science fair project.

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

Discover which fabrics shrink the most in the wash and why.

In this experiment you observe and determine how well your cat uses his whiskers to navigate through a maze.

Learn how to make a hygrometer to measure relative humidity in this project. Make a sling psychrometer hygrometer with gauze, thermometers, and a bottle.

Check out this fun and easy science fair project idea on germination of a seed and learn to identify exterior and interior parts of a bean seed.

Science fair project which determines whether plants are able to get enough nutrients from different types of garbage.

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!

Saturn is the ringed planet in our solar system, a gas giant with rings made of ice and dust. Let's make a cool scale model with an old CD and some glitter!

Find out whether putting something on top of a plant will inhibit its growth.

In this science fair project, kids observe the expansion of liquids when frozen and determine if some liquids expand more than others in the freezing process.

Enter the buzz worthy world of bee watching and find out what time bees like to wake up!

How does smell affect taste? Ready your taste buds--in this project, you'll gather some test subjects and do a taste test to see how much smell affects taste.

Science fair project in which you will attempt to throw a ball the greatest horizontal distance possible by using different angles.

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.

Find out which type of sponge holds the most water.

This project examines whether playing music during class helps students learn or if it distracts students from learning.

This science fair project idea explores whether there is a connection to the color a person wears and the way their emotional state is perceived by others.

How powerful is the reaction between baking soda and vinegar? Find out here!

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

The objective of this science fair project is to observe the differences in heat absorption for darker colors vs. lighter colors.

How well can people recall what they have observed. Test your knowledge in this fun experiment.

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

Can you plant the insect-attracting borage plant to increase the amount of beneficial insects in your garden? Find out in this experiment!

Did you know a mouse eats almost fifty times as much as a cow? Find out how and test out the strange science with your friends!

Discover how and which salt melts ice the quickest.