Tsunami warning follows quake off El Salvador coast

Tsunami warning issued and then cancelled for stretch of central American coastline last night, following strong 7.3-magnitude earthquake off El Salvador coast.

Earthquakes rattle southern California

Southern California was shaken by a series of small to moderate earthquakes near California-Mexico border on Sunday, August 26.

Isaac expected to become hurricane and approach Florida Keys

Everyone from Houston, Texas east to Tallahassee, Florida should watch Isaac closely. Hurricane Watch issued for part of northern Gulf of Mexico coast.

Extreme US summer temperatures occurring more frequently

Extreme US summer temperatures are already occurring more frequently in the U. S., and could become normal by mid-century, says study.

Hurricane Andrew 20th anniversary

It's been 20 years since Hurricane Andrew hit the southeast coast of Florida. What a storm. What a story.

A songbird’s epic migration across hemispheres

Scientists used miniature tracking devices to reveal the 18,641-mile migration of a small songbird called the northern wheatear.

Carbon nanotubes can be toxic to aquatic animals

The researchers urge that care be taken to prevent the release of carbon nanotubes into the environment.

How did zebras get their stripes?

The exquisite stripes on zebras have been explained in many ways. A recent explanation involves blood-sucking horseflies.

Mississippi river well below normal in 2012

Two space images of the Mississippi River - one from August 2012 and the other from August 2011. You can see that the riverbed is drier in 2012.

How you can help scientists study earthquakes

The Quake Catcher Network is looking for volunteers to use motion sensors on their computers to capture seismic data from earthquakes.