Wouldn't it be cool if you could create a rain cloud? Or call cosmic rays into view? Well, you can do both! All you need is an aquarium, a slide projector, dry ice, and a few other easy-to-get supplies.

Weddell seals spend about 90% of their time submerged, making them a tricky animal to study. Before Davis developed a special camera, scientists could only speculate about the seals' lives below the ice.

Years ago, this 11th-grader from Hawaii relied on dried-up hapu'u fronds to build forts in the rain forest. Today, he knows that the rain forest itself relies on those very same fronds.

Dip your toes into the study of salmon habitats with this eighth-grader from Washington State as she researches why there hasn't been a large run in Salmon Creek since the early '90s.

"Some plants don't seem to notice the change in weather, but others, like the aspen, have a new outfit for each season," writes this 10th-grader from New Mexico in her winning Young Naturalist essay.

How safe is the drinking water in your town? This 10th-grader from Utah decided to test water samples to find out the answer for himself. Then, he devised a creative way to improve surface water.

In a 29-gallon fish tank, this ninth-grader from Virginia created a tropical freshwater ecosystem—and then watched how fish that could never meet in nature interacted.

This 12th-grader from Michigan had never seen a single mushroom growing in her yard ... so she was astonished to discover more than 14 different types. Were they new, or had she overlooked them?

Oscawana has all the symptoms of a dying lake. Join this seventh-grader from New York as she hunts for the culprits—and examines what can be done to restore the lake.

Did you know that earthworms migrate during the winter? Find out where they go—and other fascinating details—as this eighth-grader from New York examines their underground world.