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.

Assess physical and mental states of subject before and after drinking coffee. Compare initial expectations with their reported conditions.

In this free science fair project idea, kids will conduct an easy electrolysis of water experiment to test solutions of salt, baking soda, tap water, and more.

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!

This project explores the effectiveness of various common household ingredients in cleaning tarnished and oxidized coins.

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.

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.

Can playing video games trigger an adrenaline rush even though there's no real danger? In this cool experiment you'll learn all about how fight-or-flight works!

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

This experiment evaluates whether frequent texters have better finger dexterity compared to people that rarely use text messaging.

This high school science fair project investigates if small changes in your diet alter the pH of your saliva.

This experiment will explore if a randomly iterated algorithm will result in a pattern.

How is NASA able to launch something into orbit around the Earth? Learn about the relationship between gravity, speed, and orbit in space in this cool project!

In this cool sound resonance experiment, learn about frequency and pitch, and use a tuning fork to calculate sound velocity in air.

This science fair project idea quantifies exactly how accurate the cricket thermometer is.

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

Science fair project that determines which materials cause the most friction by sliding blocks of wood down a ramp.

Find a mathematical relationship between the intensity of a sound wave and distance from the sound source. Use a pedometer and a sound level meter.

A fun, life science sxperiment idea idea involving strategies for keeping birds away from crops using a distress call. What kind of distress call works best?

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.

Science fair project idea helps conceptualize probability. Compare probabilities and outcomes of cards drawn from a standard playing deck.