There are seven subspecies of marine iguana, and they all live in the Gal

A treasured collection of geologic samples from the Arizona mine where her grandfather worked launched this 7th-graders's interest in Earth science.

This 9th-grader from Pennsylvania has many fond memories of the creek near her house—yet, this creek contains no aquatic life. Join her as she sets out to determine why.

Saddle up for a visit to the Circle F Dude Ranch, where this 7th-grader from Florida will introduce you to ... gopher tortoises. These burrowing reptiles have shovel-like forelimbs.

Is an aspen's diameter affected by its distance from the center of the grove? The search for the answer to this question sent this 8th-grader from Colorado on a two-year-plus expedition.

The common periwinkle, now one of the most abundant marine gastropods on the North Atlantic coast, was introduced accidentally to Nova Scotia around 1857. Investigate it with an 11th-grader from Maine.

On a hiking trip, this 12th-grader from New Brunswick spied a peregrine falcon. A second trip brought the discovery of another falcon—a rare breeding pair. But then the mystery began ...

This 10th-grader from Arizona's neighborhood noticed that her association requires that all dry vegetation around homes be removed. Her study finds that when native vegetation is wipped out, desert animals also disappear.

Like Earth, the Moon rotates on its axis. So why do we see only one view of its face? Grab two oranges, and let this 8th-grader from Pennsylvania show you the answer.

Like generations of scientists before her, this 11th-grader from California understands that the key to scientific investigation is asking the right questions. Here she asks whether diatoms could be used to assess water quality.