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This Memorial Day weekend kicks off what promises to be the best vacation travel season since 2007. With job security the strongest it's been in years, Americans are abandoning the staycation for far-away fun.

Floodwaters began to penetrate towns in the Atchafalaya Basin after a massive spillway was opened to divert water from population centers. Many residents heeded orders to head for higher ground, hoping that the intentional flooding would be merciful to their way of life.

Floodwaters began to penetrate towns in the Atchafalaya Basin after a massive spillway was opened to divert water from population centers. Many residents heeded orders to head for higher ground, hoping that the intentional flooding would be merciful to their way of life.

The president pivots from foreign affairs to an issue that has stalled under his watch — comprehensive immigration reform. His speech in El Paso is seen by critics as political theater, coming at a time when bipartisan efforts have dead-ended.

The president pivots from foreign affairs to an issue that has stalled under his watch — comprehensive immigration reform. His speech in El Paso is seen by critics as political theater, coming at a time when bipartisan efforts have dead-ended.

Amborella is the first known flowering plant and, like the platypus, a genetic dead end. Selaginella's relatives are the fossils in fossil fuel. Now, scientists are studying the genes of these plants, looking for clues about evolution and compounds that might be applied to medicine or agriculture.

Amborella is the first known flowering plant and, like the platypus, a genetic dead end. Selaginella's relatives are the fossils in fossil fuel. Now, scientists are studying the genes of these plants, looking for clues about evolution and compounds that might be applied to medicine or agriculture.

Scientists have begun cleanup efforts in some of the regions that were most affected by oil from the BP spill last April. They're trying to establish which methods — if any — work best.

Scientists have begun cleanup efforts in some of the regions that were most affected by oil from the BP spill last April. They're trying to establish which methods — if any — work best.

High oil and gas prices are emerging as a big issue in the 2012 presidential campaign. Oil market analysts say recent price hikes have more to do with turmoil in the Middle East than with administration policies. Still, potential Republican candidates are trying to draw a direct line between high gas prices and President Obama.