This science fair project idea explores whether people have an innate feel for the passing of time from a few seconds to 20 minutes.

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.

In this cool science fair project idea, kids conduct the ruler drop test on volunteers to determine whether reaction time can be improved with practice.

Does your middle school teenager have good reflexes? Gauge his reaction time in this science and math activity that requires only a yardstick and a friend.

This science fair project idea investigates the difference in reaction times between boys and girls.

This science fair project idea explores whether boiling and freezing water will have an effect on how much it weighs.

What can you do with hair after its cut? This science project teaches you practical uses for human hair.

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.

Discover whether the â5-second ruleâ is effective at determining whether food is still safe to eat after being dropped on the ground.

This project compares the strength of one, two, and three-ply toilet paper.

You've heard all about oil spills, but can they really be that bad? After all, vegetable oil is in almost every yummy baking good from cookies to brownies.

In this science fair project, students discover how sedimentary layers form as sediments like mud, silt and sand settle over time.

The goal of this evaporation experiment is to learn about how different external conditions affect drying time.

This basketball project explores the best way to make the perfect shot every time.

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

This science fair project compares the allelopathic affects of juglone, a chemical agent produced by the Black Walnut tree, on two plants.

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

Science fair project that determines whether cooling eggs helps them be peeled more easily. Compare the time it took to peel each egg.

Science fair project which examines the relationship between frequency of spider web vibration and spider's response time.

The objective of this science fair project is to examine the effects of temperature on salt and water solutions, as they form crystals over time.

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

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!

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.

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

With a clear bottle and a few plastic straws, you can easily make a hummingbird feeder and demonstrate the effects of atmospheric pressure at the same time!

Study the life cycle of the common blowfly as it relates to forensic investigation. Record the first time you see flies, maggots, and eggs.

In this activity, your child will make her own "quicksand" to better understand how a substance can be both fluid and solid at the same time.

The next time you've got a restless second grade earth scientist on your hands, use this experiment to demonstrate crystals and make a tasty treat, too!

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

Every time a sound is produced it emits a sound wave. This experiment demonstrates how sound travels, using nothing more than a spoon and a string!