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

This is a quick, easy science fair project that conveys the idea of density to preschool and early elementary children.

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

This project can help prepare your child for a trip to the tide pools, or give him a way to remember some of the many creatures he saw during his visit.

Help your child get to know the least-appreciated of the five senses, the sense of smell, with a smelling station.

Teach your child how butter is created by shaking up cream the old-fashioned way.

Make some easy homemade yogurt with your young scientist, and see what a few 'live' bacteria can do in the right conditions!

This activity provides a solution to all those leaves on your doorstep, while also giving your child a fun science lesson.

In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

Help your second grade scientist explore the timely topic of wind speed using a version of the classic Beaufort Scale.

Combine your child's natural curiosity with his developing classification and writing skills by helping him create a backyard field guide.

These science fair experiments demonstrate the chemistry of rust and the oxidation process.