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

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.

Collect meteorite dust with a magnet in your very own backyard! The objective of this science fair project is to gather meteorite dust to study outer space.

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

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

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

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

This science fair idea project identifies the active ingredients in soap and experiments with the properties of soap.

This cool and easy elementary school science fair project idea provides the basic information on the use of our senses to experience the world about us.

Kids will discover the meat science behind the meat they eat, and find out how to use safe chemistry to make meat more tender.

This is a quick, easy science fair project that conveys the idea of density to upper elementary students.

With Halloween right around the corner, find a way to use your brain and reward your tummy with a new type of science -- candy science!

In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

The goal of this golf science fair science fair project is to determine whether the temperature of a golf ball affects its elasticity and its rebound.

In this windmill model science project, you will build a windmill to learn about wheel-and-axle machines and how these simple machines are used to do work.

This easy and inexpensive paper towel science project introduces kids to important physical concepts like cohesion, adhesion, and capillarity.

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

This science fair project idea provides evidence that air is everywhere and takes up space.

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

Kids get step-by-step instructions for how to make a rubber band car and explore the physics of potential energy with this fun engineering science fair project.

Kids explore how a single movable pulley can confer a mechanical advantage over a fixed pulley in this cool engineering science fair project for 2nd grade.

Play with balance and simple engineering as you hurry to create a sturdy rock tower.

How greasy are your potato chips? Students will use a reliable method to quantify greasiness and compare different brands in this great science fair project.

This science fair project idea observes products available in the school cafeteria and waste produced by these products.

What causes the seasons to change? Kids find out by modeling the earth's tilt using a globe, flashlight and graph paper in this cool science fair project idea.

In this plastic wrap science fair project, you'll learn about polymer permeability and find out which plastic wrap keeps food from dehydrating best.

This science fair project idea examines the distance a person travels on an average day and to relate that to an understanding of the size of the Earth.

Science fair project which determines whether it is numerically possible to be connected to every person on the earth within six degrees of separation.

Can a toy car determine the strength of a magnet? In this cool magnet science fair project, young scientists will learn how to measure the strength of a magnet.