Prove that the Earth is not flat. The objective of this science fair project is to measure the angle of the sun and calculate the circumference of the Earth.

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

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

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

In this open-ended activity, students will be given a small quantity of three types of materials and asked to design a prototype for “something that will improve the school.”

Use chemical analysis to identify a variety of mystery powders that look the same but actually have very different properties.

What are the effects of fertilizer on plant growth? What's the best fertilizer type (solid, liquid or powder)? Kids find out in this science fair project idea.

This science fair project examines how tsunamis travel by simulating a tsunami moving around an island. You will generate a pretend tsunami in a swimming pool.

What is mulch? Kids will provide soil with a wet blanket of mulch and see if that helps keep drought-stricken soil damp.

This science fair project investigates whether tapping the top or the side of the can will stop a vigorously-shaken can of soda from exploding.

In this activity, your child will be challenged to create a device that protects an egg when it is dropped from a height of about 10 feet.

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

This science fair project idea investigates if webbed feet help a duck (and others) swim.

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

In this exciting design challenge, your child will use design thinking skills to create a mixture that can inflate a balloon.

Science fair project that examines how temperature affects density and how density in turn affects the behavior of helium gas.

Do lefties just write different or are their brains different? This science project has students explore what it means to be left handed.

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

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

Science fair project which teaches you how to make your own homemade glue by combing curdled milk with baking soda.

Science fair project that compares the freezing temperature of salt water and freshwater in order to learn about supercooling and condensation nuclei.

Little scientists will make inferences about hearing loss, pitch, and frequency in this great science fair idea that puts the human ear to the test.

Find out whether optical mice are useful on all surfaces or if there are drawbacks to this supposedly superior solution to the traditional roller-ball mouse.

This science fair project idea studies which kind of rock (sedimentary, igneous, or metamorphic) is most damaged by frozen water.

This science fair project idea attempts to train a worm to complete a simple maze in order to find out if worms can learn and remember.

This science fair project idea investigates the hardness property of minerals.

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

This science experiment has students test whether a snail moves faster on concrete or dirt.