The air you breathe is teeming with more than 1,800 kinds of bacteria, including harmless relatives of microbes associated with bioterrorist attacks, according to a new study.

Super eruptions that blast loads of ash sky high can change the climate. Now scientists are finding that the relationship could go both ways with the climate having an impact on huge volcanic eruptions.

A Japanese research team has succeeded in filming a giant squid live -- possibly for the first time -- and says the elusive creatures may be more plentiful than previously believed, a researcher said Friday.

The fossils of a dinosaur that measured as long as an NBA basketball court were recently recovered in Spain.

Acid rainfall in the Appalachian Mountains has decreased in recent years and organisms in its streams are thriving. But the environmental comeback could be creating new problems of its own.

You are in a land of green towers, a grove of old-growth coast redwoods in northern California's Humboldt Redwoods State Park. As you move through this cathedral forest of iconic pillars, suddenly the canopy opens and the sun shines through.