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2011 Tornado Death Toll Is Worst Since 1953Twisters have killed hundreds of people so far this year.
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Tornado Grew with Rare Speed on Way to JoplinThe storm intensified with unprecedented speed and strength.
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Joplin Tornado Whipped Up With Terrifying SpeedThe storm intensified with unprecedented speed and strength.
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For Sale: World's Largest Shark JawsThe massive jaws are made with the 7-inch teeth of a prehistoric monster.
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Contest Unveils Year's Best Night Sky PhotosAstounding views of stars and planets from right here on Earth.
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Human vs. Alien: Contest Pits Divers Against Spiny Lionfish InvadersCan the relentless, ravenous fish be stopped?
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Human vs. Alien: Contest Pits Divers Against Spiny InvaderCan the relentless lionfish be stopped?
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Extreme Weather Strikes Blow to Monarch ButterfliesMonarchs are flying too far north for their own good.
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Spain's Surprisingly Deadly Earthquakes Were Small But ShallowThe relatively low magnitude quakes caused significant damage.
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What Is to Blame for the Mississippi Floods?Interplay of record rains, geography and human intervention behind devastating Mississippi floodwaters.
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Shark, Not Man, Attacked Shark, Video Shows
'Shark Man' vindicated by video of shark attack victim.
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Ocean 'Opera': 6 Whale Species Heard Near NYCNew York City has some big neighbors.
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Florida Fishing Contest Targets Spiny Alien InvadersBeautiful fish with big appetite are taking over and killing off the natives.
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Hurricane Hunter Plane Tours East CoastScientists welcome public aboard, raise awareness ahead of hurricane season.
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Whale of a Record: 306 Humpbacks Spotted Near AntarcticaWhales feasted on krill buffet, could spell problems in future.
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Earthquake Drill This Week in Midwest: Prudent or Silly?Tornadoes more associated with region, but quakes have shaken here before.
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Modern-Day Cavewoman Explores Spectacular CavesThis adventure is not for the faint of heart.
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Creepy Crawlies & Flying Wonders: Incredible Cave Creatures -
Tiger Sharks' Mysterious Migrations Surprise ScientistsThe long migration routes surprised researchers.
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Catch & Release: Great White Shark Science Sparks ControversyGreat white shark research provokes monster-size debate.
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'Shark Man' Roils the Waters With Great White QuestGreat white shark research provokes monster-size debate.
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'Asian Unicorn' Reserve Created to Protect Mysterious SpeciesSome of most elusive creatures on Earth getting new protected area.
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'Asian Unicorn' Reserve Created to Protect Mysterious SpeciesSome of most elusive creatures on Earth getting new protected area.
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Japan Tsunami Debris Expected on U.S. Shores in 3 YearsSome concern about radioactive material among flotsam from Japan tragedy.
