What chromosome combinations determine a fetus gender? Use probability to think about whether a sperm and ovum will create a male or female in this project.

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

This science fair project idea investigates how the height at which a pendulum is released affects the length of time it continues.

This science fair project idea determines if the temperature of rubber effects how high it bounces.

This science fair project focuses on the use of a conductivity device that will determine if a substance dissolved in water can or cannot conduct electricity.

Does the temperature of a magnet affect its strength? Learn about the relationship between magnets and temperature with this cool physics science fair project.

This science project challenges students to study deer behavior in their natural habitat- the feeding patterns, social behaviors, male to female ratio, etc.

Discover that the absorbency of fabrics depend largely on the shape and structure of the individual fibers that make up the fabric.

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

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

In this cool physics experiment, use double plane mirrors at various angles to learn about light reflection. Then, see if you can solve a puzzling problem!

Kids will make a beautiful rainbow in a jar and learn what enables different types of liquids to remain distinct in separate layers.

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

Science fair project determines relationship between number and variety of insects and spiders by collecting and counting invertebrates in a ecosystem.

This fun science project helps to investigate how much water can a plant take up and release in a certain period of time through the process of transpiration.

Get down to the rubber with this science project that tests the effectiveness of different types of erasers.

This science fair project idea explores substances that cause a bubble to last longer.

Did you know your body is full of simple machines? This project looks at one of the third-class levers in the human body: your arm!

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

The objective of this science fair project idea is to examine light refraction as it passes through liquid crystals.

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

Test your friends to find out if you can replicate the placebo effect's incredible results.

Take a closer look at your furry friend (or the furry friend of a neighbor -- with permission) to discover if communication exists between cats and humans.

Check out this cool science fair project idea to explore the risk of mechanical deterioration of artifacts placed in a storage box due to mold outbreaks.

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

Kids make a paperclip perform an act of magnetic levitation and test how effective various materials are at magnetic shielding in this science fair project.

The purpose of this science fair project is to explore whether UV light passes through some colors and not others by looking at blue, red, purple, and clear.

The objective of this science project is to determine the length of time for different seeds to germinate.

Here's a first grade ladybug game that explores how air can move solid objects, and adds some measurement practice, too. Play, learn, and enjoy!