Treason's afoot in the castle! The king has entrusted you, a lowly page, with a dangerous mission.

Travel through time, from the earliest records of humankind.

Explore the expertly rendered 3-D model of Mir, even travel to the Moon’s mysterious dark side and scan hundreds of unexplored craters.

Explore the expertly rendered 3-D model of Mir, even travel to the Moon’s mysterious dark side and scan hundreds of unexplored craters.

Discover the savage secrets of Earth’s most ferocious creatures! Rewind history, oh, about 200 million years!

Here is the ultimate guide to the forces and forms of our dynamic planet.

Created in response to global concern for the environment, Encyclopedia of Endangered Wildlife increases awareness of how and why animal and plant species are disappearing today.

Climb aboard a research ship and learn about dolphins, turtles, plankton and other organisms that call the open seas home.

Here is a highly visual, interactive encyclopedia that will take you on an exhilarating journey through the world of nature.

All the fun of a TV Quiz Show... where the payoff is a smarter brain!

First, Soak Up Knowledge as you explore 20 amazing 3-D worlds. Trek a rainforest. Safari in Africa. Dive the Pacific & More. It's a super-exciting, totally engaging way to learn!

Then, Know The Answers as you compete to gain major points, win cool prizes, or even face off against friends and family. It's nail-biting, brain-tickling, ego-boosting fun!

Take the most fascinating journey of all--an exploratory trip into the secret world of the human body itself!