In this science fair projects, students will grow out the bacteria that collect on air conditioner filters.

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

In this science fair project, students make their own rain gauge to measure rainfall.

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 experiment tests if dog saliva can really help heal wounds.

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

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.

Find out whether putting something on top of a plant will inhibit its growth.

Do different types of oil mix or stack? Find out in this science fair project idea!

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

Find out whether packaged seeds actually do expire in this new science fair project idea.

In this science fair project, kids start a chemical reaction that will make a balloon inflate itself!

Science fair project that determines whether tapping a pomegranate with a spoon helps it release its seeds.

This science fair project idea explores whether a plastic slinky works as well as a metal slinky when walking it down the stairs.

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

In this project, all you need is a protractor to learn how to use the altitude of Polaris to find latitude on Earth. Polaris is also known as the North Star.

This science fair project idea examines which type of insulation holds in the most heat.

This science fair project idea explores the different properties of matter.

This project determines what category of person is most likely to be ticklish.

Examine the effect of pressure on carbonation in soda.

The goal of this project is to create an exciting topographical map out of dough.

Demonstrate how static electricity can cause an object to move. It also examines just how an object affected by static electricity will move.

This science fair project idea explores whether white light can be separated into different colors.

In this experiment you will replicate the mummification process by making a hot dog mummy.

examine how passive solar heating works, measure temperature in a parked car on a sunny day. ways to use passive solar heating as an alternative, energy

This science fair project idea discovers whether there are some objects that do not fall at a constant rate.

Have you ever seen fruit decay? Find out if a fruit will rot faster if you open it versus leaving it untouched!

This science fair idea examines hydrogel superabsorbent polymer crystals. They can absorb 500 times their weight in water. Can they absorb other liquids too?

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

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