Andrea Mustain

Large-scale climate conditions bear some of the blame.

Twisters have killed hundreds of people so far this year.

The storm intensified with unprecedented speed and strength.

The storm intensified with unprecedented speed and strength.

The massive jaws are made with the 7-inch teeth of a prehistoric monster.

Astounding views of stars and planets from right here on Earth.

Can the relentless, ravenous fish be stopped?

Can the relentless lionfish be stopped?

Monarchs are flying too far north for their own good.

The relatively low magnitude quakes caused significant damage.

Interplay of record rains, geography and human intervention behind devastating Mississippi floodwaters.

'Shark Man' vindicated by video of shark attack victim.

New York City has some big neighbors.

Beautiful fish with big appetite are taking over and killing off the natives.

Scientists welcome public aboard, raise awareness ahead of hurricane season.

Whales feasted on krill buffet, could spell problems in future.

Tornadoes more associated with region, but quakes have shaken here before.

This adventure is not for the faint of heart.

The long migration routes surprised researchers.

Great white shark research provokes monster-size debate.

Great white shark research provokes monster-size debate.

Some of most elusive creatures on Earth getting new protected area.

Some of most elusive creatures on Earth getting new protected area.

Some concern about radioactive material among flotsam from Japan tragedy.