Do this experiment to help your first grader understand how salt can be removed from salt water. All it takes are a few household materials.

The buoyant force of water explains why some objects float in water. But why do some objects sink? Find out in this physics experiment and learn about density.

In this activity, your child will be challenged to make a tower using paper cups.

Does putting soapy water on plants help or hinder plant growth? Kids learn about greywater and how it affects plant growth in this cool science fair project.

This easy Halloween-themed science experiment for first-graders is perfect for chilly October afternoons or great as a Halloween party activity.

What is it about a Slinky that causes it to walk down the steps? This simple experiment is a perfect illustration of both gravity and momentum.

Learn all about balance and motion as your child designs a corn maze!

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

Kids explore how a single movable pulley can confer a mechanical advantage over a fixed pulley in this cool engineering science fair project for 2nd grade.

This science fair project idea builds models of various types of bridges and then determines which bridge design is the strongest.

This science fair project idea experiments with spinning color wheels and optical illusions.

In this challenge, students are tasked with creating an insulated cup that will keep beverages colder for longer than a regular cup.

In this open-ended activity, students will be given a small quantity of three types of materials and asked to design a prototype for “something that will improve the school.”

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

Demonstrate how you can make your own compass using a magnetized needle. It also allows you to compare magnetic north and geographic north.

Use pepper and soap to discover some fun facts about the properties of water.

Explore the craters, maria, and highlands on the surface of the Moon! In this fun science project you'll create a 3-D model of the moon using paper mache.

In this fun experiment, we'll find out how color affects heat absorption!

Kids build a desert food chain, desert food web, and desert food pyramid in this cool science fair project to learn about trophic levels and consumers.

In this fun science project, learn about what happens to cut fruit and experiment with how to stop apples from turning brown.

In this hands-on design challenge your child will make their very own Rube Goldberg Machine.

In this exciting design challenge, your child will use design thinking skills to create a mixture that can inflate a balloon.

Have your child kick off their summer vacation by making a miniature water slide!

Kids will learn how to make a thermometer to to explore liquid density in this great science fair project. Which liquids are affected by temperature the most?

Explore solids and liquids with your young scientist by making gluep, a goopy substance that can behave like both a solid and a liquid!

In this activity your child will create their very own marble maze!

Roasting pumpkin seeds makes for a great Halloween activity, and a healthy snack!

This easy and inexpensive paper towel science project introduces kids to important physical concepts like cohesion, adhesion, and capillarity.

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

In this activity, students will create a stop motion animation by creating a clay figure and taking a series of digital photographs.