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This is a quick, easy science fair project that conveys the idea of density to preschool and early elementary children.

This science fair project idea recreates the movement of planetary bodies in order to learn why they sometimes appear to move backwards.

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.

This science fair project idea explores whether a plastic slinky works as well as a metal slinky when walking it down the stairs.

This science fair project idea explores whether a sundial is as accurate as an atomic clock when telling time.

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

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

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

In this project, create and examine garden mulch to find out what critters live in the messy, muddy layers just above the soil.

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

In this project, you'll build a model of the earth, complete with all seven continents and four major oceans.

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

Science fair project determines relationship between number and variety of insects and spiders by collecting and counting invertebrates in a ecosystem.

Learn about the fruit fly life cycle in this experiment. Capture fruit flies to examine various stages of insect metamorphosis.

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

In this cool project, create a lighted, scale model of the different layers of the Sun, including the core, radiation and convection zones, and photosphere.

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.

In this microwave plant experiment, find out whether microwave radiation will affect radish seed germination. Will it help or hinder the plants' growth?

Construct batteries that make electricity from fruits with this fun science fair project.

Get this cool science fair idea to explore how arctic tundra animals change their behavior and adapt to survive in long, cold winters.

Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.

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