Is it time to close all the zoos?

Who doesn't love a good zoo? The animals, for one. Many of the most popular attractions at zoos are animals like tigers and bears, who are particularly prone to boredom and depression when cooped up. That's why some people want to close traditional zoos and take a different approach.

Conflict & Justice

Listening to the Deep Ocean

Scientists are establishing a worldwide network of deep-sea listening posts connected to the Internet. It allows researchers -- and the public -- to hear whales, ships, and other underwater sounds. But the US Navy is uneasy.