Meet one of the world's most influential scientists. Construct a compass and a flashlight. Find out how to pop through a wormhole. And further explore physics with these 10 kid-friendly titles.

Perfection certainly wasn't something to strive for, according to Einstein. In fact, he believed that messing up was a part of being successful—an idea that, itself, has proven relevance.

Do you know how to describe where you are in the fourth dimension? Or what it would take to turn a rabbit into a black hole? Explore the fascinating nature of space and time.

Take a world-wide tour of biodiversity. You'll meet mollusks in the reefs off the Bahamas, the aye-aye in the tropical forests of Madagascar, and the clever mimic-ant spider that lives in Australia.

Did you know that forests with leaves above the water can grow in the ocean? Grab the magical magnifying glass, and see how many different plants and animals you can find in this virtual mangrove swamp. 

The ocean's one diverse place—with alga so tiny that 10 million can fit in a single teaspoon to whales longer than three school buses. Take the surfboard challenge, and ride the waves of biodiversity!

To survive in the icy Pacific, a sea otter has about a million hairs in every square inch of its fur. Now, that's dense! Take a close look at ocean adaptations while boosting your OLogy card collection.