In this free science fair project, build a star clock and learn how to tell time on a clear night by observing the big dipper!

An hour glass, also known as a sand clock, keeps time. In this activity, your child will make her own sand clock and measure the time it keeps.

This science fair project idea explores whether a sundial is as accurate as an atomic clock when telling time.

Believe it or not, the common spud has enough electrochemical energy to power a small digital clock.

This fun science fair project idea explains what a circadian rhythm is and explores the types of biological activities that follow a 24 hour cycle in mammals.

This science fair project idea teaches that time always passes at the same rate and nothing we do in our daily life âreallyâ affects how fast it moves.

This science fair project idea teaches how the gases and pollution in the air affect the earth's atmosphere temperature.

How do you tell time without a watch? Use the sun! This simple activity will show your child how to build his own sundial.

In this "paper and pen" science fair experiment, students will research the difference between standard time and astronomical mean time.

Research different measurement systems, design your own new or improved system that can measure something difficult to measure with traditional systems.

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

Free science fair project idea that examines cheating in school-age children. Project involves a task in which children are tested on various tasks.

Enter the buzz worthy world of bee watching and find out what time bees like to wake up!

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.

In this fun experiment, we'll find out how color affects heat absorption!

Science fair project which identifies the most effective insulator that you could use to make a winter coat by comparing how well cloth and cotton trap heat.

In this science fair project, we'll explore how blocking the sun's light can stop those can stop photosensitive paper from changing color.

Is it amplitude? Weight? Length of string? Kids will discover what factors changing the period of a pendulum depends on in this fun and easy physics experiment.

Study the effects of wind and temperature on evaporation. Place wet sponges in different environments, check at regular intervals, track time required to dry.

Science fair project that determines the relationship between the temperature and the rate of cricket chirping. How many times do crickets chirp each minute?

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

Demonstrate Newton's laws of motion by examining the relationship between mass, force, and acceleration during free-fall.

Do you love to make Jell-O? Find out in this science fair project idea if it is possible to make Jell-O with just warm water.

This experiment will evaluate if the environments that people work in affect their speed and accuracy in performing mental tasks.

What keeps a an item cooler, polymer crystals or ice? Find out in this cool science experiment!

Will increasing the amount of salt in water effect how slow or fast the water freezes?

In this activity, you'll not only make your own bouncy balls at home, but your child will also learn how polymers are made.

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

Learn how to tell time by the sun with this cool science fair project idea that tracks how the accuracy of a sundial changes over time.

Check out this fun middle school science fair project idea on Newton's third law of motion and how you can change the speed of a rocket.