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.

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.

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.

A wide belt of asteroids lies between Mars and Jupiter, and was formed at the same time. If these asteroids had come together to form a 10th planet, what would it be like? Students investigate the answer.

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

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.