Hurricane Irene is now Category 2, but it could still cause billions in damages. New York City has ordered the first mandatory evacuations in its history.
Cameras on the International Space Station, 230 miles above the Earth, captured new views of powerful Hurricane Irene churning over the Bahamas on August 24.
An innovative survey shows 8.7 million species on Earth, with 86 percent of those yet to be discovered, described and cataloged. Read more on unknown species.
Yesterday's earthquakes in Colorado and Washington took place in areas of low earthquake hazard. But there is no area on Earth completely immune from seismic activity.