The objective of this science fair project is to analyze the effects of salinity and temperature on water.

Learn how to make a hygrometer to measure relative humidity in this project. Make a sling psychrometer hygrometer with gauze, thermometers, and a bottle.

What are buttress roots? In this fun science project, make a model of a rainforest tree and learn how they help trees survive in the tropical rainforest!

Show your child that the simplest ingredients (salt and water) can be used to illustrate the concept of density!

This science fair project idea determines if the temperature of rubber effects how high it bounces.

If your fourth grader is obsessed with all things glow-in-the-dark, then here's an activity that will really light up her imagination!

Glass is see-through, but usually you can still see that it is there. In this experiment, we use baby oil to make glass go completely invisible.

Make sourdough bread...and learn some colonial history and modern science in the process!

This science project teaches students the relationship between compost and plant growth. Students conduct an experiment with different types of compost.

A simple science experiment exploring the physics of water pressure that's been amazing people since Medieval times.

Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.

Put your young paleontologist's puzzle-solving skills to the test by having her hunt for dinosaur bones and then assemble them to create dinosaur skeletons.

How do icicles form and what do they look like? Do this free science fair project and watch the formation of icicles occur right before your eyes.

Use chemical analysis to identify a variety of mystery powders that look the same but actually have very different properties.

This science fair project idea investigates how color affects temperature.

Learn how to make a food pyramid with animals in a a coniferous forest ecosystem around your home.

Your child can use leaves and grass to create his own outdoor art in celebration of Earth Day...all he needs are is the great outdoors and some creativity!

In this science fair experiment, children demonstrate the relationship between the amount of stuff and the amount of pressure in a closed system.

In this fun project, use a memory game to test various age groups and determine whether aging directly affects short-term memory loss.

Make your own helicopter using a paper clip and a sheet of paper. Hold the spinner up in the air, let it go, and watch it spin gracefully to the ground.

Help your child plant a "tea garden": a garden made of herbs for making teas.

Here's a fun science experiment that's refreshingly tasty too! Turn regular water into a tasty treat perfect for consuming on a hot day.

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

This science fair project idea explores whether cats can be trained in the same way that dogs can.

Little scientists will make inferences about hearing loss, pitch, and frequency in this great science fair idea that puts the human ear to the test.

This cool and easy elementary school science fair project idea provides the basic information on the use of our senses to experience the world about us.

Science fair project idea which teaches you how to make butter by separating cream into butter and buttermilk.

In this science and engineering activity, children will explore types of tunnels and their purposes and then design and build a tunnel of their own.

This project examines whether people's taste perception is influenced by what they see.

In this design challenge, your child will make a bottle rocket using typical household items.