In this project, you'll build a model of the earth, complete with all seven continents and four major oceans.

In this science fair project, young children will become aware of and have the opportunity to experience the four basic tastes: sweet, sour, salty, and bitter.

Show your kids the power of baking powder by conducting a simple experiment. Make four batches of cornbread, all identical except for one thing: baking powder!

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.

Here is a hands-on activity to help third graders understand the four points of a compass...and how we use them to get around.

Learn about the microclimate of your backyard by tracking rainfall, temperature, and observed weather with hand drawn charts and graphs.

Help your child add some flair to the family garden with pencil pinwheels!

Want to boost math and science learning? Take a bug expedition and give your first grader practice observing and charting what they see.

Encourage your kindergartener to investigate and chronicle the weather she observes during the coldest months of the year.