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The Mississippi River and its tributaries continue to rise. In Memphis, Tenn., hundreds of homes already are underwater and thousands of people have moved to higher ground. Floodwaters there are expected to crest Tuesday just under the record level set in 1937.

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.

It started as a banner year for female candidates. More ran in party primaries than ever before, especially Republicans. Some posted big victories Tuesday. But for the first time since the 1970s, the total number of women in the new Congress will likely drop.

As religious as this country may be, many Americans are not religious at all. The group of religiously unaffiliated – dubbed "nones"-- has been growing. One-fifth of Americans say they're nones, as are one in three under 30. They're socially liberal and aren't looking for an organized religion.

Airlines are flying fewer planes to small and midsize markets, part of a push to move more people through regional hubs, according to an MIT study. As the economy tumbled into recession, airlines shut down money-losing routes and moved to fill seats on remaining flights.

My love comes with microbes, with 80 million bacteria in a single kiss. And couples who share more than nine long kisses a day end up with similar mouth microbiomes. Pucker up!

A new report by Rutgers University shows only 27 percent of recent high school graduates who are not enrolled in college have full-time jobs. Many young people with only high school diplomas say their hopes for the future have been dashed by the high cost of college.

Syria began withdrawing army tanks Tuesday from the restive city of Homs, an opposition stronghold. There, doctors often treat injured anti-government protesters in an underground network.

Syria began withdrawing army tanks Tuesday from the restive city of Homs, an opposition stronghold. There, doctors often treat injured anti-government protesters in an underground network.

Despite the bad economy, the number of Americans who struggled to get enough to eat did not grow last year, and in some cases declined, according to new government data. Still, a near-record number — almost 49 million people — were affected.