This science experiment tests whether warm or cold water works best in making cut flowers last longer.

Analyze competed scientific studies to determine the effectiveness of ancient remedies. Create a chart that illustrates the effectiveness of these treatments.

How does a compass work? What's a magnetic field? Kids will build their own compass at home to find the answers in this great science fair project idea.

Determine the relationship between the speed of a sound and the temperature of the air it passes through.

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

In this pinto bean germination experiment, you'll learn about how fertilizer aids in growing pinto beans into seedlings.

In this cool science experiment, learn about magnetism and poles, and test magnet strength to find out if two magnets are twice as strong as one.

Kids will learn how to show the direction of magnetic field lines and create a permanent model using iron filings in this great science fair project idea.

Start your toy engines -- this is going to be a fast and friction-filled race!

Science fair project which determines if plants really do need water to grow, or whether they just need to be kept wet.

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

This science fair project idea investigates how magnetism can defy the force of gravity.

This project examines Newton's First and Second Laws of Motion with a bicycle and water balloons.

Kids will learn how to measure the viscosity of liquids by making their own homemade viscometer in this great science fair project idea.

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.

Scavenger Hunt! Check out this fun science fair project idea to explore the difference between opaque, translucent, and transparent objects around your house.

How does smell affect taste? Ready your taste buds--in this project, you'll gather some test subjects and do a taste test to see how much smell affects taste.

How can we describe the relationship of magnetic field strength vs. distance? Kids will find out with this free science fair project idea.

This science project researches the correlation between barometric pressure and wind velocity.

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

This experiment investigates if small changes in your diet can alter your basal body temperature.

This simple heat transfer experiment is a great introduction to the concepts of heat transfer and conduction.

Kids will learn how to make a steam powered rocket boat, also called a putt putt boat or a pop pop boat, in this great science fair project for 4th graders.

Science fair project which compares the rates of photosynthesis for various light sources. Which type of light will be best for photosynthesis and why?

This project explores whether nails, toothpicks, straws, or pen nibs are best for applying ink to paper.

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

Demonstrate how we are able to locate sounds, echolocation. Have a blindfolded subject locate you by the sound of your clapping.

Can you imagine a sky filled with bright, colorful bubbles? Make this whimsical scene come alive with bubble science!

This science fair project determines if the allelopathic chemical produced by the black walnut tree biodegrades immediately or persists over several days.

Science fair project that determines which types of clouds are best at blocking harmful UV radiation.