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The rolling NASA laboratory called Curiosity has begun its two-year mission on the Red Planet. The nuclear-powered robot pulled off a tricky touchdown in a Martian crater. There is a lot riding on this mission — not the least is the $2.5 billion price tag.

The five people who died while trying to catch a glimpse of the wrecked ocean liner included a Guinness World Record holder, a deep sea entrepreneur, wealthy businessmen and "Mr. Titanic."

The FBI says that, with scientist Bruce Ivins' suicide, the case against him is effectively closed. Doubts are emerging, however, as to whether he really was the 2001 anthrax killer. His handwriting does not match up and he could not have possibly done it all alone, fellow scientists say.

Beta agonists, a class of drugs widely fed to cattle and hogs to make them put on weight faster, are coming under increasing scrutiny. Reports suggest animals fed these drugs can seem reluctant to move — lethargic, unable to walk properly — and may die more often, too.

The snowpack in the Mountain West is at just a small fraction of its normal level, and it was the driest year ever recorded in many parts of California. Cloud seeders are trying to squeeze raindrops out of Mother Nature by spraying tiny silver iodide particles into incoming clouds.

The Special Operations Command, which runs the Green Berets and Navy SEALs, is teaming up with scientists and engineers to build a suit with more protection, a wearable antenna and computers that monitor wounds. They hope to have working prototypes within a few years.

For the past couple of years, NASA has been using remotely piloted aircraft to study hurricanes. And they are turning up new information about things like how dust from Africa can determine whether weather systems become hurricanes in the Atlantic.

Identifying where ice melts can help cities in planning for a future with elevated sea levels. In New York City, the sea level would be affected more by melting ice in northern Greenland than Canada.

Researchers used equipment that detects muons. Measuring the density of the tiny particles yielded an image of what's behind the pyramid walls with no damage to the ancient structure.

Fifty years ago, Jocelyn Bell Burnell saw a blip in the data from a radio telescope she helped build. The discovery of pulsars was "one of the biggest surprises in the history of astronomy."