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In this science fair project, we learn how air molecules move as a result of density, convection, and air currents.

Engineers in training can get started with this simple wheel-and-axle construction activity.

In this cool experiment, learn how to find specific gravity of minerals using liquids of different densities to see which substances and items sink and float.

In this science experiment, your child will test the strength of hollow structures in order to understand how strong bird bones really are.

Before Twitter, birds were the ones tweeting, not humans. Have your child discover the magical sounds of nature while recording birds around his neighborhood!

Science fair project that examines the different types of precipitation, evaluates the density of snow and calculates the ratio of snow-to-liquid.

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.

This easy aerodynamics activity is a simple way to introduce kids to the scientific method.

Learn how to demagnetize a magnet and how physics can explain this phenomenon with this enlightening science fair project.

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.

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

The purpose of this science fair project is to build a basic radio.

Blend art and science in this hands-on activity that shows your kindergartener how primary colors combine to make secondary colors.

Check out this cool science fair project idea that models the behavior of the cold desert plants: xerophytes and halophytes.

Show your child that the simplest ingredients (salt and water) can be used to illustrate the concept of density!

Sink or swim? Calculate the density of various fruits and vegetables using water and a kitchen scale.

Why do plants wilt? Kids will learn to think critically about what environmental factors affect plants, and what plants need to survive.

In this science fair project, students focus sunlight with a magnifying glass and trap shorter waves to melt ice.

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

Science fair project in which you will examine how crystals are formed by creating your own crystal using charcoal briquettes, salt, and ammonia.

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

What causes dilated pupils? Young scientists will find out by applying what they already know about changes in pupil size and making models of the pupil.

Science fair project that demonstrates the effect of detergent pollution on fresh water birds' ability to stay afloat.

This cool science fair project teaches kids about temperature, density and buoyancy using balloons that float with normal air. No helium required!