What's the best way to make DIY compost? Kids will learn about aerobic and anaerobic decomposition while learning to appreciate the value of composting.

What's the chemistry behind dyeing Easter eggs? Will adding vinegar to dye help the eggshell absorb the color? This colorful science project has the answers!

What's the science behind those out-of-sight roots? Find out if you can trick roots into growing in different directions.

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

This project demonstrates the correspondence between the volume of water displaced by a submerged object and the volume of the object displacing it.

This is a quick, easy science fair project that conveys the idea of density to upper elementary students.

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.

This science fair project investigates whether tapping the top or the side of the can will stop a vigorously-shaken can of soda from exploding.

Have you ever noticed the way a dropped stone makes a fun pattern in a pond or lake? What's the science behind these splashy occurrences?

Test whether plants can grow without sunlight and water.

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 classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

While your cells are much too small to see without a microscope, you can create the look of a cell in your very own home with just an egg and vinegar!

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

Explore scientific concepts with this experiment that introduces kids to the scientific method!

Ever wonder why refrigerator lights turn off when you close the door? Does the darkness prevent food from spoiling? This experiment, determines just that.

Future engineers, unite! Discover how to keep a sandcastleâs bridge from falling into the moat.

It's not actually that hard to get energy from garbage! Kids learn how to make biogas in the form of methane with this cool and easy science fair project idea.

The objective of this science project was to build a model of a volcano and observe reaction between different substances, including baking soda and vinegar.

This classic children's game demonstrates how sound travels through air vs. through a solid.

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

Cleaning can be a chore, but not with this sudsy experiment!

Find out whether we can create motion in a dish and as a result, create a wonderful and colorful show.

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

Discover whether a metal will expand under hot water.

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

In this free science fair project, build a star clock and learn how to tell time on a clear night by observing the big dipper!

Check out this fun science fair project idea for 1st grade: a solar eclipse model that demonstrates total, partial, and annular solar eclipses.