Which has more oxygen: ocean water that has been aerated by turbulence, or bay water that has been fed by oxygen-producing plants? This ninth-grader from New Jersey learns that getting the answer is not all that easy!

At 1,292 feet (394 meters) below sea level, the Dead Sea is the lowest point on Earth. But it's not the depth but the sea's saltiness that buoyed the imagination of this seventh-grader from New York.

Set your alarm for 2 a.m., and trek along with this 11th-grader from Pennsylvania on the 102nd Christmas Bird Count. You'll start the day at Mingo Creek County Park. Be sure to wear a hat!

What turns a pond into an acid, waterlogged peat bog? Poor drainage and thousands of years, for starters. Go bog trotting with this eighth-grader from New Hampshire to learn more about the process.

Chances are you've heard the saying "There's no such thing as a free lunch." But did you know that it's one of fundamental laws of ecology? Explore all four with this tenth-grader from Wisconsin.

Before a bald eagle can soar majestically through the sky, it must learn how to fly. Get a firsthand look at several eaglets' first flights with this 12th-grader from Alaska.

How is cordgrass able to survive the high salinity of a marsh when other plants can't? An amazing adaptation that lets it secrete excess salt, as this ninth-grader from Virginia discovered.