| CNN.com delivers up-to-the-minute news and information on the latest top stories, weather, entertainment, politics and more. | Earth's mantle | | Humans have reached the moon and are planning to return samples from Mars, but when it comes to exploring the land deep beneath our feet, we have only scratched the surface of our planet. |
| American checks planes for loose seats | | An American Airlines flight from Chicago to London made an unscheduled landing Tuesday at Shannon Airport in Ireland after a passenger reported a smoky odor, an airline spokesman said. |
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