In this science fair project, students use the streak test to tell minerals apart from each other.

This science fair project has kids conduct a blindfolded taste test to determine how smell influences our ability to taste foods.

Handedness and footedness refer to whether people prefer to use their left or right hand and foot. In this experiment, test hand and foot dominance.

Get down to the rubber with this science project that tests the effectiveness of different types of erasers.

Kids will conduct a cool limewater carbon dioxide test that can be performed with common household materials to learn about the chemistry of this common gas.

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.

Kids learn how to prevent erosion by growing grass. They'll test soil with grass against raw soil in this revealing science fair project idea for 4th grade.

This science project uses Mohsâ Hardness Test to show kids how to compare the hardness of different types of minerals.

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

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 the hardness property of minerals.

This science fair project on testing water hardness is a great introduction to practical chemistry. Test and learn the difference between hard and soft water.

What do ants eat? Kids find out by observing a colony of ants in this cool zoology science fair project for 4th grade.

Test whether plants can grow without sunlight and water.

Find out which kind of bubble wrap fares best when put in impact.

4th graders construct an ocean food web to learn about consumers and trophic levels, food webs, and food chains in this cool ecology science fair project.

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.

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.

Test your friends to find out if you can replicate the placebo effect's incredible results.

Gather some friends for a bubbly soda taste test do determine calories' role in your favorite drinks.

What combination of cloth and stain will be the easiest for removing stains? Test and experiment!

In this science fair project, students will try to discover if test subjects can detect the presence of Monosodium Glutumate (MSG) in food.

Have you ever wondered how many numbers most people can memorize? Test your friends to find out!

This science experiment has students test whether a snail moves faster on concrete or dirt.

Test out the pH levels of soil in your backyard versus soil in more wild environments to solve this science case.

How well can people recall what they have observed. Test your knowledge in this fun experiment.

This science fair project teaches about mold. Students will test different foods to see which grow mold the fastest.

In this science fair project, you'll make a "ghost" appear in a test tube, and learn about what happens when hot water and cold water interact.

Tired of gum with flavor that lasts for just a couple of minute? Put gum to the test with this chewy science experiment!

Experiment about connection of senses of taste and smell. Using blindfold and noseplugs, administer blind taste test. Analyze results and organize data.