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In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

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

What's the relationship between temperature, air humidity and static electricity? Kids will find out with this free static electricity science fair project.

In this simple science project, learn about what causes dew and what affects dew formation with a drinking glass, ice, and a soda bottle.

In this fun science project, learn about what happens to cut fruit and experiment with how to stop apples from turning brown.

Check out this fun science fair project to make a vinegar and baking soda balloon and demonstrate how gas is created as a result of the chemical reaction.

In this CD hovercraft science project, students will construct their own DIY hovercraft.

For this science fair project, kids will learn how to make a lemon battery. They can conduct this classic experiment using readily available materials.

This science fair project idea determines which method of hand cleansing is the most effective.

How does a flashlight work? Kids will make a complete circuit and explore how voltage contributes to brightness with this science fair project idea.

Students will investigate the thermal conductivity of metals by learning how to measure thermal conductivity with this fun and easy science fair project idea.

Does putting soapy water on plants help or hinder plant growth? Kids learn about greywater and how it affects plant growth in this cool science fair project.

This science fair project idea explores how far the âdanger zoneâ is from different types of caution signs.

The objective of this science fair project is to analyze the effects of salinity and temperature on water.

This science fair project idea determines what household items are good conductors of electricity.

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

This science fair project idea determines if crystals will absorb food dye and if colors will mix by the process of diffusion.

What is condensation? Little mad scientists will learn about condensation, states of matter, and air pressure by conducting this cool science experiment.

This science fair project idea determines what household items are good conductors of electricity.

Students pit the heat capacity of water against the heat capacity of oil while looking at the effects of dipole rotation in this cool science fair project idea.

Cleaning can be a chore, but not with this sudsy experiment!

Kids will create their own version of Richard Feynman's rubber band heat engine to learn about thermodynamics with this cool science fair project idea.

Kids will learn how to show the direction of magnetic field lines and create a permanent model using iron filings in this great science fair project idea.

This science fair project explores how osmotic pressure forces water through the root up into the plant.

Water, along with soil and light, is a necessary component for plant growth. So what's better for promoting plant growth: tap water, or rain water?

This science experiment tests why guacamole goes brown and if leaving the pit in will stop guacamole from turning brown.

Want to see a great example of Newton's first law? Kids will learn about basic physics with this fun, ballistic experiment.

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

The objective of this science fair project is to test the growth rate of a plan in a crystal medium in comparison to traditional soil.

Here is a fun middle school science project on factors affecting solubility. Learn how dissolved solids can "crash out" to form crystals when conditions change.