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Do human lie detectors exist? Charge up your powers of observation to see if you can tell a lie from the truth.

Science fair project that examines oxidation, reduction and chemical indicators by testing for the presence of the iodide in salt.

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

Thermometers are how we measure temperature, and we've all heard the terms "centigrade" and "Fahrenheit" tossed around, but what do they really mean?

This science fair project idea explores the different properties of matter.

How well can people recall what they have observed. Test your knowledge in this fun experiment.

The apparent movement of the sun has been used to keep time since the bronze age. In this science fair project, kids plot solar time against mean solar time.

Test the combustion of different types of woods.

Did you ever add salt to pasta? Did it help cook the pasta faster? If not, find out in this science fair project idea.

This science fair project idea investigates the hardness property of minerals.

Develop a new system for predicting geographic changes. Demonstrate the nature of geographic change. Make logical predictions.

Science fair project that determines what neurons are, what they do and compiles this vital information in an illustrated book.

In this fun project, use a memory game to test various age groups and determine whether aging directly affects short-term memory loss.

The purpose of this science project is to determine which chemical best lowers the temperature of water in a cold pack and if the amount affects its use.

Construct calorimeter and determine the caloric value of a sample of foods by change in temperature for each of the foods.

What is elasticity? Students will investigate how this concept applies to bouncing ball physics by testing the bounces of balls made out of different materials.

Check out this cool science fair project on identifying rocks and minerals for kids.

Find out whether a longer airplane will fly farther or a wider paper airplane.

Will the shape of an ice cube impact how fast the ice melts?

Young scientists will investigate people's preferences for saltiness, and make some inferences about genetics and diet.

This science fair project idea explores if male or female humans are more likely to exhibit some form of color blindness.

This project analyzes people's emotional responses to images in painting vs similar images in photographs.

This project examines whether and what associations exist between numbers and letters and colors.

This science fair project idea discovers whether there are some objects that do not fall at a constant rate.

This science fair project idea investigates how a bottom keel helps keep a boat from rocking back and forth.

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

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

This science fair project idea examines whether plants are still able to grow normally if they are turned upside-down.

This science fair project idea explores if objects dropped from a high distance will equal a greater impact force than the object dropped from a low distance.

By incorporating natural materials and the powers of observation, your child will become a backyard naturalist while building early writing and drawing skills!