NASA discusses trip to Mars to bring back rock and soil samples back to Earth. Here, they could be analyzed for fossilized traces of alien bacteria.

New results from a particle accelerator experiment suggest that matter does seem to win in the end.

The story of how plants and animals on Mount St. Helens have rebounded after its cataclysmic eruption 30 years ago shows how ecosystems respond to major disturbances.

AP - With the electorate's intense anger reverberating across the country, this is all but certain: It's an anti-Washington, anti-establishment year. And candidates with ties to either better beware.

AP - Downtown Bangkok turned into a flaming battleground Wednesday as an army assault toppled the Red Shirt protest leadership, enraging followers who fired grenades and set numerous fires that cloaked the skyline in a black haze.

AP - Scientists are anxiously awaiting signals about where a massive oil slick in the Gulf of Mexico may be heading, while containment of the looming environmental catastrophe proves elusive.