Every four years something funny happens with our calendars -- we add a day! Why do we do this? Discover the science behind leap year.

Meet the red wolf, an endangered species of animal that was once very common, but in the past 50 year nearly became extinct!

Did you know that some caribou travel 3,000 miles in a year? This fun worksheet is jam-packed with fun facts about the caribou!

Learn facts about Venus, the planet that shines the brightest in our night sky! Then practice your knowledge of the solar system with bonus trivia at the end.

It's easy being green when you have our Earth Day game for a guide. Just print out this Earth Day game and get ready to score one for the planet.

Learn about the science behind one of nature's most awesome spectacles: monsoons.

Get swept up in this comprehensive worksheet about the awesome power of dust storms.

Learn all about the science of the movies and the basic concepts behind how they work.

Dive into the deep, vast world of ocean science with this introductory sheet on the world's different oceans.

Learners will discover a simple overview of the human muscle system in this introductory worksheet.