For centuries, Latin America's poison-dart frogs have helped hunters capture their prey. Today, they're also helping scientists combat disease. Take a close (safe!) look at these vividly colored frogs with this 15-year-old student.

When this 12-year-old from New York came face to face with a house full of cockroaches, he didn't run away. Instead, he got the bug to learn more about these virtually indestructible creatures.

By keeping a nature journal, this 16-year-old from Colorado quickly saw how aspens support and sustain biodiversity. Learn more about the most widely distributed tree species in North America.

The one constant in this world is change. Watch Lake Wildwood cycle from man-made lake to lakebed mudflats to marsh and finally back to lake with this 18-year-old from Georgia.

Take a nature walk through the fields and wooded areas in the back-hill farm country of New York State with this 15-year-old. But watch out for wild dogs!

Bacteria—the oldest, simplest, and most numerous forms of life—can reproduce as often as every 20 minutes. Learn more about their significant role in ecosystems from this 13-year-old from Ohio.

How did tropical fish end up in Montana's Trudau Lake? And do they go dormant to survive the winter? This eighth-grader's winning essay investigates and answers these questions and more.

With most of its rocks buried and completely unknown, Antarctica is the last continental frontier. Go with Finn under the ice to find out how Australia and Antarctica once fit together.

Working in the extreme environment of Antarctica calls for supreme gear and machines—that is, unless you're naturally outfitted, like an emperor penguin or elephant seal.

From leaf margin and arrangement to the parts of a flower and a corn seedling, take an illustrated look at plant morphology with this collection of guides.