Overview

Each fall, a remote stretch of volcanic sand in Costa Rica transforms into one of nature’s greatest spectacles: Tens of thousands of sea turtles arrive en masse and nest in unison. But this breathtaking event hides a surprising paradox that may actually help save the species.

At a rocket test range in Alaska, scientists are firing rockets into the northern lights. They want to better understand the aurora because they are the visible fingerprint of a powerful and dangerous force that can disrupt GPS, satellites, and power grids. We join them at a launch to find out what they've discovered.

America’s most toxic lake may also be one of its most overlooked resources. At the Berkeley Pit Superfund Site, scientists are extracting clean energy materials from a century of mining waste.