Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

How powerful is the reaction between baking soda and vinegar? Find out here!

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.

Explore the effect of wind speed on the burning rate of a candle.

The purpose of this science fair project is to demonstrate how yeast, a fungus, causes bread to rise.

Compare different remedies for cooling the mouth after eating spicy food.

Compare the amount of ozone in various locations with this science fair project that will have your kid create her own ozone strips!

There is debate about whether chalkboards or whiteboards are better. This experiment explores which leads to better retention of visually-displayed information.

This experiment will explore if magnetism has any effect on the regeneration abilities of flatworms.

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

This science fair project teaches kids experimental design and how to test if subjects can really sense if they are being watched.

In this experiment, kids will see if pruning tomato plants makes them more fruitful and learn about the factors that contribute to a plant's fruit production.

What is biodiversity? Kids will study different areas of their backyards to see which is the most diverse to learn about biodiversity and random sampling.

What are the effects of fertilizer on plant growth? What's the best fertilizer type (solid, liquid or powder)? Kids find out in this science fair project idea.

Science fair project that compares the ecology of different soil samples by identifying which sample has the most invertebrates living in it.

This experiment provides a graphic illustration of the chemical reaction that occurs when you activate a hand warmer.

Science fair project that determines whether disinfectant sprays or disinfectant soaps are more effective at removing bacteria from hands.

In this microwave plant experiment, find out whether microwave radiation will affect radish seed germination. Will it help or hinder the plants' growth?

The objective of this project is to evaluate whether a top will spin at different rates during different phases of the moon.

This science fair project idea builds models of various types of bridges and then determines which bridge design is the strongest.

In this experiment two environments will be compared: a room with interior design that uses correct Feng Shui versus one with incorrect Feng Shui.

This science fair project idea explores whether a person's ability to see under very dim lighting conditions diminishes with age.

In this science fair project, students examine under what conditions individual plants release seeds and how far the seeds are released.

The objective of this science fair project is to experiment with balancing everyday objects and observing the the effects of gravity on materials.

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

Kids will learn some cool stuff about chemical reactions by determining what happens when you mix different concentrations of hydrogen peroxide and yeast.

Determine the differences between various bicep exercises, both in terms of how much muscle exertion they create and how they affect your heart rate.

In this science fair project, apply the principles of leverage and force by building six simple machines designed to set weights in motion.

This project is about after-images and what possibly affects them.

Check out this cool science project idea to learn about rocks and explore the cycles of formation, breakdown, and reformation of rocks in the Earth's crust.