Sink or swim? Calculate the density of various fruits and vegetables using water and a kitchen scale.

Help your child get a grasp on what it was like to build gigantic ancient structures with this easy engineering activity about science and physics.

The objective of this science fair project idea is to determine if sound travels best through the air, water or a solid.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

Get your fifth grader involved in some earth science by helping her plan and create her very own rock collection.