With unblinking eyes the size of soccer balls and a body that can stretch the length of a bowling alley, the giant squid has long fascinated humans. Investigate the largest invertebrate on Earth.

Did you know that the world's deserts keep expanding each year? Or that islands have the highest animal extinction rate—75 percent? Take a closer look at the major habitats found on Earth.

Travel to the Galápagos Islands and follow in Charles Darwin’s footsteps with this interactive investigation. You’ll have the chance to collect clues as you investigate the islands’ species.

More than likely with a good guess you could detect a heart-shaped leaf from one that's oval or narrow. But do you know how to recognize a leaf that has a lobed or divided shape? Learn how. 

Go beyond petals and leaves! Learn how to identify a flower's stamen, anther, filament, stigma, and more with this illustrated look at the parts of a flower. 

What can scientists know about a creature by examining its bones? And what can they only guess at? Show students with this hands-on activity. 

Unicorns and dragons and Sasquatch, oh my! Continue the investigation of fantastic creatures with this mythological menagerie of books.

For centuries, people around the world have told stories about dragons, unicorns, and mermaids. See what may have inspired people to believe in these legends.

From fire-breathing dragons to magical unicorns, take a look at four legendary mythical creatures. Then find out what scientists think may have sparked belief in these imaginary animals.

You just might be surprised by how diverse and interdependent the living things around your school are. Investigate a patch of sidewalk, a grassy or wooded spot, or even someone's front yard.