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.

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

In this experiment, students find out what happens when a less-dense fluid interacts with a denser one, replicating the effect of cooler solid rock on magma.

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

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.

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

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

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

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

Observe how your brain works while it is focused on one thing, and how it works while you are distracted by another thing.

Have your child build a model of a coral polyp, one of the tiny animals that composes a coral reef.

Science fair project which tests various sedimentary, igneous and metamorphic rocks to find out whether one rock family is stronger than the others.

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

Let your fabulous crafter use their favorite flowers, fruits and herbs to whip up a delicious perfume that they can proudly present to a friend or a loved one.

The goal of this science fair project is to discover the science behind carbonated soft drinks and apply this knowledge to create a new one.

Celebrate autumn with a seasonal bash. Welcome the fall with a festive party for your little one and her friends, full of crafts, snacks and fun games.

Unlike other seed sprouting projects, this one allows kids to compare five different sprouts (either 5 herbs or 5 flowers) by watching them grow in a glove.

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

Learn whether writing things down really makes things easier to remember.

Watch pre-packaged seeds and seeds taken from inside fruits and vegetables grow. Which ones will grow faster? Read more in this science fair project idea.

This science fair project idea investigates whether plants can survive being frozen.

Science fair project that determines whether landscaping fabric impacts the ability of plants to receive water.

Have your kid determine if a goldfish can be conditioned to expect food the same way Pavlov's dogs did with this fascinating science fair project.

Teach your child how butter is created by shaking up cream the old-fashioned way.

Give your child an introduction to food preservation by making and canning your own yummy, homemade pasta sauce!

Show your fourth grader how to see her heart in action. Make a simple device out of a drinking straw and clay to help her spot the movement of her pulse!

In this activity your child will create their very own marble maze!

In this fun science fair project idea, kids will experiment with various methods in order to discover the fastest way to cool a soda.