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What heats up fasterâwater or soil? 5th grade students test the specific heat of water against the specific heat of sand in this great science fair project.

Kids learn how to prevent erosion by growing grass. They'll test soil with grass against raw soil in this revealing science fair project idea for 4th grade.

Does electricity move better through thick wires or thin ones? kids will conduct this classic electricity experiment for this science fair project.

Research Earthship buildings. Draft a unique architectural design that repurposes used, discarded radial tires. Build scale model of structure.

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

Look at people's face shape. Do you think their face shape affects your perception of kindness? Find out more in this science fair project idea!

Science fair project which will teach you more about the foods that you eat, and learn which ones are healthier choices.

Watch pre-packaged seeds and seeds taken from inside fruits and vegetables grow. Which ones will grow faster? Read more in this science fair project idea.

In this science fair project, students will use four different household objects to see which ones form the most or best crystals.

Do heavier objects fall faster than lighter ones? Students learn the answer by watching the effect gravity in a vacuum has on a coin and a feather.

4th graders construct an ocean food web to learn about consumers and trophic levels, food webs, and food chains in this cool ecology science fair project.

This science fair project idea develops an understanding through experimentation of which shapes are the most structurally strong.

Research and understand basic computer science. Build a simple computer, following instructions found online. Design a new or improved feature.

Build basic projector out of ordinary materials. Create several color transparency slides, demonstrate your creation.

Science fair project which helps you determine your latitude by using an astrolabe, which measures the angle between the North Star and the horizon.

Determine the relationship between the speed of a sound and the temperature of the air it passes through.

Build a 3d animal cell model with this cool science fair project, which helps kids visualize and understand the function of a cell's parts and organelles.

This project involves the development of a website using free software online to promote the value of science.

Learn the basic structure of a DNA strand, which is the double helix, how genes form together, and the resemblance DNA has to a twisted ladder. Create a model.

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

Consult mechanics, automotive specialists for advice. Build a real engine or a scale model. Test and demonstrate its mechanical properties.

Determine the differences between various bicep exercises, both in terms of how much muscle exertion they create and how they affect your heart rate.

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

The objective of this project is to examine the ways in which a passive solar house may contribute to conservation of energy.

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.

This experiment investigates whether the psychological phenomenon of the halo effect can be used to explain people's perceptions of others.

This project explores differences in people's reactions to images in color and images in black and white.

This science fair project demonstrates the magic of arches by challenging students to stack telephone books on top of eggs without breaking them.

What animals are most popular? This project affords practice in data-collection, record-keeping and data-analysis through the investigation of this question.

Learn about the greenhouse effect- and get great science fair experiment ideas. Read more.