Sea otters are often portrayed as lovable and relaxed animals that spend their time goofing around. Or, simply floating on their backs in the water with their special rock. While this image is ...

The saga of the Klamath provokes a more fundamental, yet often ignored, set of questions: What is a river for? Irrigation?

Two tiny Scandinavian settlements in Greenland persisted for nearly 500 years and then mysteriously vanished. Their ...