How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.

Magic, science, or household cleanser? Let your second grader decide with this practical, nontoxic chemistry experiment with acids and bases.

This balloon-powered car project is a great way for your kid to learn about energy and how it can be used efficiently.

Air invisible; it doesn't make sounds; you can't pick it up and throw it. So how do we know it exists? Help your second grade scientist figure it out.

Here's a classic celery science experiment that uses celery and food coloring to demonstrate how plants absorb water.

Here's a fun math and science activity: help your child explore four different kinds of measurement, using their hand and a few simple household tools.