Science fair project that guides you through how to test the humidity in the environment using a homemade psychrometer.

The Christmas Addition Tree is a great way to get kids actively involved in math practice through art projects over the holiday break.

This science project challenges students to learn about and classify weeds and discover new practical uses for weeds.

Science fair project that designs a video game that requires players to use relevant skills.

Science fair project that examines what causes thunder and why a thunderclap sounds so loud. How is lightening related to the creation of sound waves?

Discover whether cold or hot water from the faucet will boil faster on the stove.

Determine the effect of reading aloud on memory skills. Prepare a list of randomly chosen words, ask volunteers to recall as many as possible from the list.

Introduce your fourth or fifth grader to volume by having him build rectangular prisms, and then count each sugar cube to check his volume calculations.

This experiment will evaluate bacterial content on toothbrushes before and after different cleaning methods to determine which method of disinfecting is best.

Science fair project in which you will attempt to throw a ball the greatest horizontal distance possible by using different angles.

This science fair project idea examines which is the best way to get rid of water stains (stains caused by just water) on fabric.

This science fair project idea tests the efficacy of both synthetic and natural antibiotics.

Celebrate Earth Day by making a poster that encourages people not to litter.

Measure the effectiveness of detergent containing a UV-absorbing compound in blocking UV-A radiation. Use black light and UV detecting beads.

Science fair project determines relationship between number and variety of insects and spiders by collecting and counting invertebrates in a ecosystem.

In this experiment, your child will create two compost bins and see if he can determine what attracts fruit flies.

In this cool project, create a lighted, scale model of the different layers of the Sun, including the core, radiation and convection zones, and photosphere.

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.

In this experiment, you'll make a seafloor spreading model to learn more about how plate tectonics work and create mid-ocean ridges.

Enter the buzz worthy world of bee watching and find out what time bees like to wake up!

Explore how sound waves are reflected and absorbed by producing echoes. Analyze which locations produce echoes.

This simple activity is not only fun, it's also a useful way to organize children's closets — and offer kids some autonomy to boot.

Science fair project that develops latent fingerprints on a non-porous objects by converting superglue from a solid state to a gaseous state.

This experiment has students record rat behavior to learn about the benefits of rats and research rat myths throughout history.

This science fair project idea determines whether land or water warms more quickly and investigates how solar radiation increases the temperature of surfaces.

This science project teaches students about organic farming and the benefits and disadvantages of commercial plant food.

This science project is to discover which Black Walnut tree tissue contains the most concentrated amount of Juglone, a substance that works like an herbicide.

Practice early social studies skills and get your child excited about the new school year with this fun activity.

Fudge is one of very few desserts people make at home that is actually crystalline. What happens when the fudge crystallizes at different temperatures?

These science fair experiments demonstrate the chemistry of rust and the oxidation process.