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

Learn a bit about meteors, asteroids and comets as they travel across the night sky. Can your child round out the page by adding color to these orbiting rocks?

Get lost with a dizzying maze that challenges you to help the lightning bolt reach the ground!

Children learn about the food cycle in a rain forest as they color in a scene of snakes, butterflies, leopards, and other forest-dwelling creatures.

Learn about some of the major U.S. watersheds in this fascinating science and geography worksheet!