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Salad is not just a food; it's home to a flourishing community of mostly benign microbes. A new inventory finds surprising differences in the bacteria growing on popular fruits and vegetables.

The more talk there is of retirement — on TV, in pop-up ads, in news stories — the more you begin to wonder: What is retirement anymore anyway?

At least 10 students died when the shell fell on an outdoor cafe at Damascus University. Meanwhile, Turkey rejected reports that it forcibly repatriated hundreds of Syrian refugees.

Some of the best science reporters, like the best Vaudevillians, the best circus performers, the best teachers, are hungry for attention — not for themselves, but for a way to seize your mind, to bring you to an idea, a puzzle, or a creature.

The online government database was supposed to bring some transparency to the multimillion-dollar market in political TV ads, letting the public more easily see how much politicians and advocacy groups spend in major markets. But it also has inadvertently opened up some of those involved to fraud.

"Subsistence mining" is now believed to be the single largest sector for employment. But the work is arduous, windfalls are rare, and miners complain that Chinese companies exploit them.

The S&P joins the Dow Jones Industrial Average, which broke its 2007 record earlier this month. Both indices have now recovered all the losses they suffered during the Great Recession.

More than 200 manatees have died in Florida's waterways this year from an algae bloom called red tide. The deaths come as wildlife officials try to remove the marine mammal — whose biggest killer is usually boat propellers — from the endangered species list.

Deep in the Amazon, an isolated Brazilian tribe almost vanished when it first had contact with the modern world. Now the Surui tribe is working with Google to do things like report on illegal logging in the forest.

Fly from Angola down to South Africa and you'll see thousands of circles of bare dirt covering the land. They're up to 30 feet across and ringed by tufts of grass. The origin of the shapes has long been a mystery, but researchers now say hordes of termites may be acting as engineers.